1. Electronic Throttle Controller Working Principle Diagram:
red is the input signal, blue is the output signal, black is the middle signal, green is the control signal.
2. Electronic Throttle Controller Working Principle:
Electronic throttle controller
treat of throttle signal and control mainly by three chips to complete:
Master chip：main function is: receive the accelerator pedal signal through the ADC module into digital signal , through the data Processed by the DAC module converted back to the analog signal output to the op amp chip. op amp chip output Signal through the ADC module into a digital signal to detect the op amp chip output signal is normal. according to Input and output and processing is normal to elect the switch chip output control signal, when the exception occurs , will control the system chooses a switch chip to directly output the accelerator pedal signal to the vehicle ECU, otherwise it will go through the master chip control the op amp chip strengthens signal to the car ECU.
Op amp chip ：Its main function is to strengthen the master output signal to avoid interference in the subsequent transmission.
Switch chip：Its main function is to accept the master chip control in the accelerator pedal signal and op amp output signal to select an output to the car ECU. By default (no control) select the accelerator pedal signal output to the car ECU.
3.Automatic Accelerator Booster Safety Instruction:
The master chip has a hardware watchdog, when the master chip due to strong interference and other accidental events affect to crash , it can be automatically reset within 1/10 seconds to restart and resume normal working condition.
From the electronic throttle controller works principle diagram shows that the signal from the accelerator pedal to the car ECU has two channels in the electronic throttle throttler:
Channel 1: Throttle pedal -> Master chip -> Op Amp chip -> Switch chip -> Vehicle ECU
Channel 2: Throttle pedal -> Switch chip -> vehicle ECU.
When the accelerator is working properly, use Channel 1 to achieve the normal function of the throttle controller. When an exception occurs , use channel 2 directly to the accelerator pedal signal output to the car ECU to avoid the electronic throttle controller failure caused by accelerator pedal failure, automatic acceleration and other conditions.
The master chip can detect the input and output signals, when the input and output signals or internal parameters exception occurs , it can directly control the switch chip using channel 2, to avoid this exception affect the car driving.
When the master chip due to power supply module failure or program loss can not run, the switch chip will choose channel 2 as a default choice , so this situation still does not affect the car driving.