In the automotive industry, it is power steering. Thanks to it, the driver can easily control the steering wheel, especially when maneuvering at low speed. There are several types of such amplifiers today. These are hydraulic and electrical systems. But among other things, they can be equipped with additional functions. One of these is the Servotronic. What it is - we will consider right now.

Where did it come from?

The car was distinguished not only by a powerful engine, but also by excellent handling. In particular, many journalists noted the responsiveness of the steering wheel. In place it could be scrolled with one finger. However, at speed, it becomes incredibly hard. This provided the machine with excellent stability at high speeds. It was the first hydraulic booster with this function. This system was called Servotronic.

What it is? Characteristic

Servotronic is an electronic system that adjusts the power to the steering wheel depending on the speed of the vehicle. The system serves to provide comfort and control.

What cars is installed on?

Initially, the Servotronic appeared on the 34th BMW. Further, this technology was adopted by other manufacturers. These are Volkswagen, Porsche and Volvo. Servotronic was also installed on the Audi.

We already know what Servotronic is. But it is worth noting that in addition to it, there are also analogues (for example, an active steering system). We will talk about it a little later.

How does it work

With Servotronic it hardly differs from the usual one. The exception is all kinds of sensors and a control unit. Conditionally Servotronic can be divided into two parts - informative and executive. To read data, the system provides input sensors:

Power steering.
Steering wheel angle (for vehicles with ESP system).

Thus, several signals are sent to the control unit at once. Then the system processes this information and sets a certain algorithm of operation for the actuators. These include a reverse acting chamber with a spool and piston. A Servotronic solenoid valve is provided to regulate the pressure in the system. What is this element? It interacts with the Servotronic unit. When you turn the steering wheel, fluid is passed through the spool to the power steering cylinder. The latter begins to act on the wheel turning mechanism. At the same time, a signal is sent to the solenoid valve. It opens and the liquid fills the reverse acting chamber. Thus, the pressure in the cylinder drops. The reverse piston blocks the spool. The steering gain increases.

That is, the work of the Servotronic is based on throttling the hydraulic fluid in the power steering system by opening or closing the electromagnetic valve. In this case, the unit regularly receives signals of both the current speed of the vehicle and the position of the steering wheel itself. The Servotronic control unit is usually located in the glove compartment.

Malfunctions

A fuse in the system may have overheated. In the event of a system failure, the driver will immediately notice changes in the behavior of the car. The Servotronic rail will be controlled as usual with the power steering. At high speeds, the steering wheel will be as light as at low speeds. This will make the vehicle less stable on the road.

Active steering system AFS

It is analogous to Servotronic. What is this system? powered by a planetary gearbox. The latter is equipped with an electric motor. Usually installed on cars with EUR. So, the gearbox with the motor is installed on the steering shaft. The system has its own control unit, which, like the Servotronic, receives signals from various sensors. On their basis, the electronics takes measures to adjust the gear ratio between the steering wheel and the wheels of the car. With increasing speed, this number increases. The steering wheel becomes more rigid. The system automatically selects the required gear ratio and can change it every second.

Thus, the fundamental difference between the AFS and the Servotronic lies in the way the forces are regulated. In the first case, a gearbox with an electric motor is involved, in the second, an electromagnetic valve that controls the flows and pressure of the hydraulic fluid. AFS has many benefits. So, the system is able not only to make management more stringent, but also to prevent an emergency. In the event of a skid, the electronics assesses the situation thanks to sensors and automatically turns the wheels at a certain angle.

Hello everyone!))) Recently became the owner of this option: S216A SERVOTRONIC

Power steering - Servotronic

Gearbox with Servotronic

In Kration I will explain what it is:

High maneuverability when parking without unnecessary effort, high steering sensitivity and stability at high speeds: Servotronic adjusts the steering assistance according to speed, providing a more comfortable driving experience by reducing the effort required to turn the steering wheel.

The Servotronic control unit adjusts the amplification value according to the vehicle speed. The solenoid valve precisely controls the amount of force applied by the hydraulics, which allows for extremely high steering precision, which is fully consistent with the current driving mode. In contrast to the system described, traditional power steering systems adjust the amount of power in relation to engine speed. The EPS electric power steering system uses an electric motor to achieve the same effect. Servotronic makes driving on narrow streets and parking less tiring as only minimal effort is required to turn the steering wheel. The gain decreases as the vehicle speed increases, resulting in better directional stability, steering precision and a smoother ride.

In my own words I want to say))) Awesome thing. Effort varies with engine speed and RPM. In place, he literally turns his finger. With an increase in revolutions and speed by about 80 km / h, the steering wheel becomes tighter and more informative. In general, I am terribly satisfied! :)

Control relay

The chip under the relay is located under the speaker on the driver's side

It is clearly visible here)

This is our placer for BMW) Vitaly. Skillful fingers)))

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Servotronic - what is it?

The movement of the car is provided by turning the front wheels. This is done using the steering linkage. At first, the steering wheel served only one function, but today it has acquired additional features that include hydraulics, electronics and Servotronic.

Why is it needed

Every driver wants to get at least a comfortable ride from the car. Many steering systems have significant drawbacks that make it difficult to maneuver and ride smoothly. This problem is solved by special systems that take over the adjustment of control and turns, making them more accurate or smoother, which depends on the speed of movement and the behavior of the machine.

The Servotronic was first introduced 25 years ago. The production was carried out by the ZF company, which made the implementation of the hydraulic booster system. The main task of such equipment was to optimize the speed of movement.

Operating principle

The Servotronic device is essential for safe steering. It is able to protect the car from sudden skidding at low speed and slow response of the control system when driving fast.

Today, Servotronics are produced by ZF Lenksysteme, which supplies products for more than 13 popular car manufacturers. In total, 11 million devices have been created and successfully implemented over 25 years.

Steering rack operation

First of all, the steering assistance was calculated for oversized vehicles, which found it difficult to maneuver at high speed. The control system also showed a big drawback during fast movement - the steering wheel turns created rather sharp movements, so even smooth control could produce a strong skid.

Servotronic solved this problem. It allowed even large vehicles to have precise and smooth handling. True, often the problem with maneuverability on fast movement persisted - the gain decreased and the steering stiffness increased.

Today, to prevent such situations, an electro-hydraulic converter, shut-off and reverse acting valves, and special pistons are used. In fact, the on-board computer sent signals to the control mechanism, affecting the elements of the Servotronic, due to which the speed and quality of movement were adjusted. Excellent performance is shown by Audi's Servotronic, which is considered one of the best.

Electronic control variations

During its existence, the Servotronic system has received many upgrades. In it, the rotary piston was replaced by a valve with a shutter, which in 1998 gave rise to the launch of production of Servotronic 2. The proportional control of the steering wheel depends on the speed of the car. Soon, ZF introduced an electric amplifier into this system to control the applied force.

Since the hydraulic element previously played the role of an amplifier, it could not always have normal operation. The electronic version was activated when the steering assistance was really required. BMW has been using this Servotronic for years. Thanks to him, cars of this brand are able to show excellent maneuverability not only at high speed, but also in extreme weather conditions.

The operating principle of hydraulic and electrical control is very similar. When you turn the steering wheel, the torsion bar is twisted, which sends signals to the on-board computer. After that, the command is transmitted to the electric motor, from which the steering shaft is twisted, which reduces the effort. The Servotronic sensor is the decisive link, because it is he who is responsible for the supply of hydraulic fluid through the valves, which creates the motion control.

Development prospects

In the future, manufacturers plan to completely abandon mechanical control systems, switching to full control of electronic devices. This is necessary not only for convenience, so as not to make unnecessary movements, but also for greater safety, because such a device can independently stop uncontrolled movement. This is very useful in case of skidding when the driver loses control - the Servotronic will fix problems, scan the steering elements and stop the movement, doing it much faster than a person.

Among the prospects can be attributed to the expansion of the capabilities of this system. It is planned that when cars are equipped with a large number of sensors, it will be possible to fully automate the movement, including avoiding obstacles or parking in difficult places.

The use of Servotronic is in great demand today. The driver can not always drive the car professionally, and sometimes the car can lose control. In these cases, the control of the steering force will be able to correct the course, eliminating skids. This system is being implemented in an increasing number of cars.

Many people have difficulty driving. To protect themselves from them, people try to buy cars with Servotronic. This is convenient and increases safety, but you only need to buy such a system from trusted brands, because it is responsible for the safety of the driver on the road.

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Servotronic - what is this device in the car?

Perhaps one of the most useful inventions in the automotive industry is power steering. Thanks to it, the driver can easily control the steering wheel, especially when maneuvering at low speed. There are several types of such amplifiers today. These are hydraulic and electrical systems. But among other things, they can be equipped with additional functions. One of these is the Servotronic. What it is - we will consider right now.

Where did it come from?

This function has appeared relatively recently. The idea of creating a BMW Servotronic system belongs to. What is this element, we will consider further. In 1985, at the Motor Show in Amsterdam, the BMW M5 in the 34th body was presented.
The car was distinguished not only by a powerful engine, but also by excellent handling. In particular, many journalists noted the responsiveness of the steering wheel. In place it could be scrolled with one finger. However, at speed, it becomes incredibly hard. This provided the machine with excellent stability at high speeds. It was the first hydraulic booster with this function. This system was called Servotronic.

What it is? Characteristic

Servotronic is an electronic system that adjusts the power to the steering wheel depending on the speed of the vehicle. The system serves to provide comfort and control.

What cars is installed on?

Initially, the Servotronic appeared on the 34th BMW. Further, this technology was adopted by other manufacturers. These are Volkswagen, Porsche and Volvo. Servotronic was also installed on the Audi.
We already know what Servotronic is. But it is worth noting that in addition to it, there are also analogues (for example, an active steering system). We will talk about it a little later.

How does it work

The steering rack with Servotronic is almost the same as the usual one. The exception is all kinds of sensors and a control unit. Conditionally Servotronic can be divided into two parts - informative and executive. To read data, the system provides input sensors:

Power steering.
Steering wheel angle (for vehicles with ESP system).

With their help, the system determines the position of the steering wheel relative to the steering angle of the front wheels. There is also a Hall sensor in the system. It informs about the position of the crankshaft in the engine. And the speedometer sensor transmits data about the current speed of the car.
Thus, several signals are sent to the control unit at once. Then the system processes this information and sets a certain algorithm of operation for the actuators. These include a reverse acting chamber with a spool and piston. To regulate the pressure of the hydraulic fluid, the system is equipped with a Servotronic solenoid valve. What is this element? It interacts with the Servotronic unit. When you turn the steering wheel, fluid is passed through the spool to the power steering cylinder. The latter begins to act on the wheel turning mechanism. At the same time, a signal is sent to the solenoid valve. It opens and the liquid fills the reverse acting chamber. Thus, the pressure in the cylinder drops. The reverse piston blocks the spool. The steering gain increases.

With a drop in vehicle speed, the valve closes. When parking, it is completely closed, which makes it easy to turn the steering wheel in place. As soon as the driving speed exceeds 20 kilometers per hour, the valve gradually opens. The driver needs to apply more effort to turn than usual.
That is, the work of the Servotronic is based on throttling the hydraulic fluid in the power steering system by opening or closing the electromagnetic valve. In this case, the unit regularly receives signals of both the current speed of the vehicle and the position of the steering wheel itself. The Servotronic control unit is usually located in the glove compartment.

Malfunctions

This system is highly reliable, so malfunctions are minimized. If there are any problems, a corresponding light is displayed on the instrument panel. So, in the system, power may not be supplied to the Servotronic sensor (contacts are oxidized or broken), or to the unit itself.
A fuse in the system may have overheated. In the event of a system failure, the driver will immediately notice changes in the behavior of the car. The Servotronic rail will be controlled as usual with the power steering. At high speeds, the steering wheel will be as light as at low speeds. This will make the vehicle less stable on the road.

Active steering system AFS

It is analogous to Servotronic. What is this system? This is a unit powered by a planetary gearbox. The latter is equipped with an electric motor. Usually installed on cars with EUR. So, the gearbox with the motor is installed on the steering shaft. The system has its own control unit, which, like the Servotronic, receives signals from various sensors. On their basis, the electronics takes measures to adjust the gear ratio between the steering wheel and the wheels of the car. With increasing speed, this number increases. The steering wheel becomes more rigid. The system automatically selects the required gear ratio and can change it every second.
Thus, the fundamental difference between the AFS and the Servotronic lies in the way the forces are regulated. In the first case, a gearbox with an electric motor is involved, in the second, an electromagnetic valve that controls the flows and pressure of the hydraulic fluid. AFS has many benefits. So, the system is able not only to make management more stringent, but also to prevent an emergency. In the event of a skid, the electronics assesses the situation thanks to sensors and automatically turns the wheels at a certain angle.

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What is Servotronic? Device and principle of operation

In a driving school, we are taught, first of all, the ability to handle the steering wheel - this will determine the safety of traffic and the directional stability of the car. Thanks to a device such as a power steering, it is much easier to turn the steering wheel.

However, certain problems arise, for example, it is more difficult to turn the steering wheel at low speed than at high speed, but in theory it should have been the other way around. Agree that when you are driving around the city at low speed, you have to turn the steering wheel more often: when parking, when driving through roundabouts, when turning, and so on. In doing so, we are putting in some effort.

On a straight track, the picture is completely different - the driver moves at speeds of 90 km / h and higher, but the power steering works in such a way that at such a speed you need to apply less effort to turn the steering wheel. One wrong move, and the car goes into the oncoming lane, goes into a skid.

At high speeds, controlling the situation is much more difficult. (This problem is solved by turning off the hydraulic booster at high speeds or switching to another mode).

To distribute the efforts at different speeds correctly, a device such as Servotronic, aka Servotronic, was created.

What does it give us?

When driving around the city with Servotronic, we need to apply less effort, especially when parallel parking or when reversing into the box, when the steering wheel literally has to be turned from the extreme left position to the extreme right. When we rush along the highway, the gain decreases, that is, you have to make more effort to turn the steering wheel, which ensures directional stability and a smooth ride.

Servotronic device and principle of operation

Before we schematically describe the structure of the Servotronic system, it must be said that it is used on cars of Volkswagen, BMW, Volvo, Porsche. Many other manufacturers install electro-hydraulic amplifiers with the "City" and "Highway" modes, the steering gain decreases on the highway, and on the contrary increases in the city.

Servotronic is a complex system that consists of several key elements. A very important role is played by the power steering sensor or the steering angle sensor, as well as the speedometer sensor, which analyzes the current driving speed. In addition, the control unit Servotronic receives information from the ECU about the rotation speed and position of the crankshaft.

All these sensors collect information and transmit it to the control unit, which processes it and sends commands either to the bypass solenoid valve (if there is a power steering), or to the electric pump motor (electrohydraulic booster). Accordingly, at low speeds, the valve lets more hydraulic fluid into the power cylinder and the steering gain increases - the force is transmitted from the traction and the wheels turn. If there is an EGUR, then the pump motor begins to rotate faster, increasing the flow of fluid into the tank.

At high speeds, the opposite happens - the valve receives a signal from the Servotronic control unit to reduce the flow of fluid, the steering power is reduced and the driver has to apply more effort.

To fully understand how Servotronic works, you need to know how the various power steering systems work: hydraulic, electro-hydraulic or electric.

Servotronic, however, only slightly adjusts their work, adjusting the steering gain for specific driving modes. The main actuators in different systems are an electromechanical valve or an electric pump motor. More advanced systems are also being developed that will over time greatly simplify and make driving safer.

(2 assessments, the average: 5.00 out of 5)

Servotronic is a speed-sensitive power steering. Depending on the current speed, Servotronic adjusts the steering assistance at the time of different road traffic situations. The Servotronic makes the vehicle's steering more flexible at high speeds, the inputs are more precise, and the driver feels comfortable and safe. At lower speeds, the Servotronic allows easy maneuverability and parking.

Easy maneuverability when parking, combined with light responsiveness and stability at high speeds, gives Servotronic. It adjusts the amount of steering assistance depending on the current speed, increasing driver comfort by reducing the effort required to turn the steering wheel.

Servotronic adjusts the amount of steering assistance depending on the vehicle speed. The solenoid valve precisely controls the amount of force applied by the steering hydraulics, allowing for precise steering that is appropriate for a specific driving moment. In contrast, conventional steering systems adjust the power steering in relation to engine speed. Electromechanical steering uses an electric motor to achieve the same effect.

Servotronic makes it easier to drive through narrow streets or while parking, as these maneuvers require minimal effort to turn the steering wheel. The gain gradually decreases as the vehicle accelerates, providing greater stability, improved accuracy and smoother vehicle behavior.

System functions

The functionality of the Servotronic is provided by the control units, among which the Servotronic control unit (SVT), which provides the setpoints for activating the Servotronic valve, is located in the car behind the glove box. The control unit is connected to the buses.

Dynamic stability control signals the driving speed.

Servotronic is of no small importance in driving and its main functions are Servotronic initialization, vehicle speed tracking, Servotronic valve supply, as well as undervoltage and overvoltage recognition in the vehicle electrical system.

Servotronic is able to activate the Servotronic valve, which is installed in the steering gear, as an actuator and an electro-hydraulic converter. The Servotronic valve throttles the flow of the hydraulic fluid, thereby reducing the pressure in the hydraulic circuit.

The valve is actuated by the control unit.

Servotronic is characterized by efficient and reliable operation. However, the hydraulic pump reduces the thrust of the engine, causing it to absorb excess fuel, which is harmful to the environment. It is especially undesirable to install such a system on vehicles with a low-power engine. The developers have found an alternative solution, the essence of which is to pressurize the working fluid with an electric pump. The control unit receives information from the steering wheel rotation and vehicle speed sensors. Thanks to these innovations, the fuel economy is approximately 0.2 liters per 100 km.

Malfunctions

In the event of a malfunction in the sevotronic, a warning lamp comes on and a message appears on the control display to warn the driver of a problem. The steering response will be different. The driver can continue at a moderate speed and exercise due care. The system should be checked as soon as possible.

Removing the Servotronic from the steering gear

Removing Servotronic is not an easy job. To carry out this work, you need special tools. If you don't have them, try to come up with your own method for removing the screws.

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What is Servotronic? Device and principle of operation

On a straight track, the picture is completely different - the driver moves at speeds of 90 km / h and higher, but the power steering works in such a way that at such a speed you need to apply less effort to turn the steering wheel. One wrong move, and the car goes into the oncoming lane, goes into a skid.

At high speeds, controlling the situation is much more difficult. (This problem is solved by turning off the hydraulic booster at high speeds or switching to another mode).

To distribute the efforts at different speeds correctly, a device such as Servotronic, aka Servotronic, was created.

What does it give us?

When driving around the city with Servotronic, we need to apply less effort, especially when parallel parking or when reversing into the box, when the steering wheel literally has to be turned from the extreme left position to the extreme right. When we rush along the highway, the gain decreases, that is, you have to make more effort to turn the steering wheel, which ensures directional stability and a smooth ride.

Servotronic device and principle of operation

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To fully understand how Servotronic works, you need to know how the various power steering systems work: hydraulic, electro-hydraulic or electric.

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Why is it needed

Every driver wants to get at least from the car. Many steering systems have significant drawbacks that make it difficult to maneuver and ride smoothly. This problem is solved by special systems that take over the adjustment of control and turns, making them more accurate or smoother, which depends on the speed of movement and the behavior of the machine.

Operating principle

Servotronic device is necessary to ensure safety. It is able to protect the car from sudden skidding at low speed and slow response of the control system when driving fast.

Steering rack operation

Today, to prevent such situations, an electro-hydraulic converter, shut-off and reverse acting valves, and special pistons are used. In fact, he sent signals to the control mechanism, affecting the elements of the Servotronic, due to which the speed and quality of movement were adjusted. Excellent performance is shown by Audi's Servotronic, which is considered one of the best.

Electronic control variations

Development prospects

In the future, manufacturers plan to completely abandon mechanical control systems, switching to full control of electronic devices. This is necessary not only for convenience, so as not to make unnecessary movements, but also for greater safety, because such a device can independently stop uncontrolled movement. This is very useful when the driver loses control - the Servotronic will detect problems, scan the steering wheel elements and stop the movement, making it much faster than a person.

Many people have difficulty driving. To protect themselves from them, people try with Servotronic. This is convenient and increases safety, but you only need to buy such a system from trusted brands, because it is responsible for the safety of the driver on the road.

Where did it come from?

What it is? Characteristic

What cars is installed on?

How does it work

Malfunctions

Active steering system AFS

Servotronic - what is it?

Why is it needed

Operating principle

Steering rack operation

Electronic control variations

Development prospects

Servotronic - what is this device in the car?

Where did it come from?

What it is? Characteristic

What cars is installed on?

How does it work

Malfunctions

Active steering system AFS

What is Servotronic? Device and principle of operation

What is Servotronic? Device and principle of operation

Why is it needed

Operating principle

Steering rack operation

Electronic control variations

Development prospects

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