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Working Principle of Electronic Throttle Control System

Working Principle of Electronic Throttle Control System

Product principle of electronic throttle and cable throttle

With the rapid development of automobile industry, as early as the 1990s, automobile manufacturers in the United States, Germany, Japan and other auto manufacturers have adopted electronic throttle control system. The electronic accelerator control system is mainly composed of accelerator pedal, pedal displacement sensor, ECU, data bus, servo motor and throttle actuator.

Nowadays, electronic accelerator is widely used in newer models. The so-called electronic accelerator is for the former cable accelerator. The traditional cable accelerator directly connects the accelerator pedal with the throttle with thin steel rope. The depth of the accelerator pedal is directly corresponding to the opening and closing size of the throttle. The electronic accelerator has no cable. By installing a potentiometer (variable resistance) in the pedal, the accelerator is depressed The depth of the throttle is converted into the resistance value of the resistance. The electronic system of the car indirectly determines the depth of the accelerator pedal by sampling the resistance value. Finally, the ECU drives the stepper motor to control the throttle opening. It is not difficult to find that the characteristics of the cable throttle are simple system, direct control, and the opening of the accelerator pedal and the throttle is 1:1. The characteristics of the electronic throttle are the throttle The pedal only represents the driver's intention to operate, and the final throttle control is given to ECU.

Working principle of potent booster

(1) Accelerating throttle opening to improve static response
The acceleration of potent booster is mainly achieved by improving the sensitivity of throttle response. When the driving computer finds that the driver has the intention to accelerate, it will drive the throttle to open quickly through the circuit signal, so that the sensitivity of throttle response is improved.

(2) Make up for acceleration of throttle signal and improve dynamic response
When the accelerator depresses the accelerator pedal, the potent booster will calculate the change rate of the accelerator signal according to the depress amplitude and time. The faster the change is, the stronger the acceleration requirements are, and the potent booster will increase the change rate to maximize the dynamic response of the vehicle acceleration.

(3) Provide false driving style for ECU to adjust engine parameters
The ECU of modern engine generally has the ability of self-adaptive driving style. If the driver often steps on the accelerator (commonly known as pulling speed), the ECU will gradually think that the driver's style tends to be fierce, so the engine will slowly adjust the throttle, fuel injection system, etc. to get the best adjustment parameters of the engine in this style. After long-term use of potent booster, even if driving in accordance with the previous mild driving style, the engine will still get intense driving experience, which is equivalent to adjusting ECU parameters. Over time, the engine will automatically modify its parameters to adapt to the style.

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