According to foreign media reports, the application of anti-lock braking system (ABS) has been very popular, this article will briefly introduce its working principle. The anti-lock braking system can improve the safety factor of the vehicle in emergency braking when driving. Otherwise, when the car takes an emergency brake in an emergency, it is easy to cause the tire to lock up, that is, the steering wheel cannot be turned, so the risk factor will increase, and it is easy to cause serious consequences.
In ABS, the brake pipeline that can independently adjust the brake pressure is called the control channel. The control channels of the ABS device are divided into four-channel type, three-channel type, two-channel type and one-channel type.
Despite the continuous development of technology, the premise of the anti-lock braking system has not changed. The system must be able to sense the speed of each wheel (wheel speed), which means that it needs to know when a wheel stops turning. This is because when the vehicle brakes, the wheels will be locked, causing the brake to fail. At this time, the ABS system can release the brake pressure of the wheel and restart its braking function.
The system uses a variable reluctance rotor (reluctor wheel), which is installed on the vehicle components, so that the driver can turn the wheel in time. In addition, an electromagnetic speed sensor is also equipped to determine the wheel speed. Then, the measured information will be transmitted to the electronic control unit, which uses the distribution valve group and pump to run the ABS system.
During braking, ABS can quickly determine the locked state of the wheels based on the speed signal from each wheel speed sensor, and close the normally open input solenoid valve on the wheel that starts to lock, so that the braking force remains unchanged. If the wheel is still locked, open the normally closed output solenoid valve. The brake pressure on this wheel will quickly move down due to the pipeline that leads directly to the brake fluid storage tank, preventing the wheel from being completely shut down due to excessive braking force. Hold to death. When the braking state is always at the optimal point (the slip ratio S is 20%), the braking effect is the best and the driving is the safest.
Surprisingly, engineers have been developing a device similar to the ABS system since 1908, but it was not configured on the 1966 Jensen FF model until 1966. Since 1971, Chrysler, Nissan, Toyota, Cadillac, Ford and Oldsmobile have been equipped with ABS systems. However, the first electronic multi-channel ABS was born in 1978, when Bosch participated in the assembly of the device.
Today, Australia requires all new cars on sale to be equipped with ABS, which means that not only new cars will benefit from buying cars, but a large number of second-hand car buyers will also experience this technology.
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