Traction Control

Traction control (another name – traction control ) is designed to prevent slipping of the drive wheels.

Depending on the manufacturer, the traction control system has the following trade names:

 

Despite the variety of names, the design and principle of operation of these traction control systems are very similar in many respects; therefore, they are considered using one of the most common systems as ASR systems.

The traction control system is built on the constructive basis of the anti-lock brake system. The ASR system has two functions: electronic differential lock and engine torque control.

To implement anti-slip functions, the system uses a return pump and additional solenoid valves (switching and high-pressure valves) to each of the drive wheels in the ABS hydraulic unit.

The ASR system is controlled by the appropriate software included in the ABS control unit. In its operation, the ABS / ASR control unit interacts with the control unit of the engine control system.

The principle of operation of the traction control system

The ASR system prevents wheel slippage over the entire range of vehicle speeds:

1. at low speeds (from 0 to 80 km / h), the system provides torque transmission due to the braking of the drive wheels;
2. at speeds above 80 km / h, the forces are regulated by reducing the torque transmitted from the engine.

Based on the signals from the wheel speed sensors, the ABS / ASR control unit determines the following characteristics:

Depending on the current value of the operating characteristics, brake pressure control or engine torque control is performed.

The brake pressure is controlled cyclically. The duty cycle has three phases – pressure increase, pressure retention and pressure relief. The increase in brake fluid pressure in the circuit provides braking of the drive wheel. It is done by turning on the return pump, closing the changeover valve and opening the high-pressure valve. Pressure retention is achieved by shutting off the return pump. Pressure relief is performed at the end of slipping with the intake and switching valves open. If necessary, the work cycle is repeated.

The engine torque is controlled in conjunction with the engine management system. Based on the information on the slip of the drive wheels received from the wheel speed sensors and the actual value of the torque received from the engine control unit, the traction control unit calculates the amount of required torque. This information is transmitted to the engine control system control unit and is implemented using various actions:

When the traction control is activated, the control lamp on the instrument panel lights up. The system has the ability to shut down.

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