ESC was first equipped by the Mercedes-Benz and BMW models on the first traction control system, it can be imposed by each wheel for different braking force and driving force to achieve traction, the system and today's ESC system is not the same, Its design was not intended to assist the steering. But the traction control system is the predecessor of ESC. Later, BMW and Bosch and mainland companies Sensor to develop a system by reducing the engine torque to achieve the vehicle to avoid control, and in 1992 in all of its models in the equipment. Between 1987 and 1992, Mercedes-Benz and Bosch developed a system called Electronic stability programm, which means that electronic stability procedures, that is, we often say ESP today, which is a set of horizontal anti-skid control can be achieved Electronic system, called ESC system.
As slippery is one of the main causes of road traffic accidents, at least 40 percent of all fatal traffic accidents are caused by slipping. ESP can prevent up to 80% of all slip accidents. ESP recognizes that if the slip is coming and is very fast to intervene. The driver keeps the control of the vehicle and does not enter the chute as long as it does not exceed the physical limit. ESP is always active. The microcomputer monitors the signal from the ESP sensor, checks 25 times per second, and whether the driver's steering input corresponds to the actual direction in which the vehicle is moving. If the vehicle moves in different directions, the ESP will detect an emergency and react immediately, regardless of the driver. It uses Fuel Rail Pressure Sensor the vehicle's braking system to 'turn' the vehicle back to the track. Through these selective braking interventions, ESP produces the required reaction force, allowing the car to react according to the driver's intent. ESP not only initiates brake intervention, but also intervenes on the engine side to speed up the drive wheels. So, in the context of physics, the car is safely kept on the desired track.
ESC is built at the top of the anti-lock braking system, and all vehicles equipped with ESC are equipped with traction control. ESC components include yaw rate sensors, lateral acceleration sensors, steering wheel sensors and integrated integrated control unit. In the United States, federal regulations require that in 2012 years after the model year, ESC will be installed as a standard configuration for all passenger and light trucks. At the same time because the ESP system is to use some sensors to determine the driver, in order to detect possible problems Pressure Sensor as soon as possible, we must resist a variety of interference forms. At the same time the important sensors are: steering wheel angle sensor, speed sensor, horizontal acceleration sensor, wheel speed sensor, longitudinal acceleration sensor, volume rate sensor. ESC uses a hydraulic regulator to ensure that each wheel receives the correct braking force. Using a similar modulator in the ABS, the ABS only needs to reduce the pressure at the time of braking. In some cases, the ESC also needs to increase the pressure, in addition to the hydraulic pump, you can also use the effective vacuum brake booster unit to meet these harsh pressure gradient.
Many ESC systems have a 'off' function, so the driver can disable the ESC, which may be desirable when it is stuck in the dirt or snow, or if a smaller size of the spare tire that would interfere with the sensor is used. Some systems also provide an additional mode of increasing the threshold so that the driver can take advantage of less electron intervention. However, when the ignition switch Throttle Position Sensor is restarted, ESC defaults to 'On'. Some of the lack of 'off the switch' of the ESC system, such as Toyota and Lexus, some of the vehicles, through a series of harmless brake pedal and hand brake to temporarily disable. In addition, unplugging the wheel speed sensor is another way to disable most ESC systems.