Application of an inertial sensor in vehicle stability system

When cars enter thousands of households, safety is becoming more and more important. The safety of the occupants is closely related to the advanced electronic systems of the vehicles used. The Airbag ABS (Anti-lock Break sySTem) system is a familiar safety protection system that everyone is familiar with. The vehicle stability system is a more advanced vehicle safety protection system. According to the German investigation, the installation of a vehicle stability system can reduce vehicle accidents by 50%. Many people may only know nouns but don't understand their meaning. And because of the different car systems, the nouns are also different.

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In fact, the core of the vehicle stability system is to add an inertial sensor, and measure the angular velocity and acceleration or inclination of the vehicle's rotation through the inertial sensor. Then, a control command is issued to a certain wheel through the ECU to ensure normal safe driving.

Vehicle stability systems have many different names, and their essence is similar. There are mainly different terms:

ESP: ElectronON Stability Program electronic stability program.

ESC: Electronic Stability Control electronic stability program control system.

VDC: Vehicle Dynamic Control vehicle dynamic control.

VSC: Vehicle Stability Control body stability control system.

RSC: Roll Stability Control

DSC: Dynamic Stability Control.

Based on the ABS brake anti-lock braking system, ESP collects information such as the steering angle and lateral acceleration of the steering wheel through peripheral sensors. These information are processed by the microprocessor, and then the hydraulic regulator sends a brake command to the wheel brakes. Achieve correction for skidding. Especially when turning, that is, when the lateral force acts, the ESP stabilizes the vehicle and keeps driving safely. ABS and TCS only work in the longitudinal direction. ESP not only uses all the components of ABS and TCS, but also includes a yaw rate sensor and a direction sensor integrated with a lateral acceleration sensor.

ESC is functionally equivalent to ABS (Antilock Brake System), EBD (Electronic Brake Force Distribution), TCS (Traction Control System), AYC (Active Deflection Control) and other functions, it can automatically correct oversteer Insufficient steering, and by keeping the driver's direction of travel and the actual direction of the car, keep the car on the correct route. When a deviation is detected, the ESC brakes each wheel independently while reducing engine torque to help the driver maintain control of the car. The ESC is actually a brake system that can brake four wheels separately or simultaneously, which is not possible with a driver who is more technically advanced.

VDC is based on ABS and TCS. It increases the angular velocity sensor for lateral swing when the car is turning. The ECU controls the driving force and braking force of the inside and outside, front and rear wheels to ensure the horizontal dynamic stability of the car. The successful development of the VDC enables the driver to provide active and effective driving safety guarantees under all working conditions. The system mainly uses wheel speed sensor, steering wheel angle sensor, yaw rate sensor, lateral acceleration sensor and wheel displacement sensor.

The VSC will detect the driving state of the vehicle at any time. When the vehicle is in a critical state of turning during the turning process, the system will automatically reduce the power output of the engine, and the front and outer wheels will brake to generate an outward force to pull the vehicle back to normal. The driving state; if the vehicle is about to understeer, it also reduces the engine power output, and applies braking to the rear wheel according to the degree of understeer, so that the vehicle returns to the normal driving path.

The RSC anti-rolling stability control system uses a slewing sensor. When the driver makes a sharp turn or a quick turn, the following operations are completed in an instant: the system records the speed at which the vehicle's tilt angle changes; according to this speed, the final angle of the tilt is calculated to determine the risk of tumbling. Degree; if there is a danger of rolling, the brake system is activated to stabilize the vehicle; thus, the driver is given time to cope with and deal with the danger.

The DSC is a further extension of the accelerated anti-skid control or tracking control system to ensure that the car still has the best tracking performance when cornering to ensure the stability of the car. The system is still good for turning the car. Tracking, equipped with more advanced detection and control equipment, if it can detect the wheel speed, as well as detecting the rotation of the steering wheel, the speed of the car, and the lateral acceleration of the car, according to the information detected above To determine whether the wheel is slipping during the turning process. If there is a danger of slipping or slipping, the computer will immediately command the brake hydraulic control system to properly brake the slipping wheel, or to reduce it. The fuel injection amount and the delayed ignition method reduce the output of the engine power, which can prevent the tire from slipping under various driving conditions, so that the vehicle can obtain good tracking in the process of starting acceleration, re-acceleration, turning and the like. Sex.

As can be seen from the above, in addition to the existing rotational speed sensor and steering wheel angle sensor, these systems require a sensor that can measure the rotation of the vehicle body to measure the angular velocity or angular velocity of the revolution, and some additional measurements of the lateral and longitudinal lines of the vehicle. Acceleration. This leads to the problem of inertial sensors.

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