Electronic speed limiter

The electronic speed limiter uses a computer to control the engine speed. The trip computer will detect the speed. After reaching the limit speed, the engine will no longer be oiled. The speed limiter is part of the trip computer. The function of electronic speed limit is to limit the excessively high speed and prevent accidents caused by excessively high speed. The electronic speed limiter can monitor the speed of the vehicle in real time. When the speed reaches a certain value, it will control the fuel supply system and the engine speed. At this time, even if the accelerator pedal is stepped on, the fuel supply system will not supply fuel.

Introduction
The electronic speed limiter uses a computer to control the engine speed. The trip computer will detect the speed. After reaching the limit speed, the engine will not be able to refuel. The speed limiter is a part of the trip computer [1].
Roleedit
The function of electronic speed limit is to limit the excessively high speed and prevent accidents caused by excessively high speed. The electronic speed limiter can monitor the speed of the vehicle in real time. When the speed reaches a certain value, it will control the fuel supply system and the engine speed. At this time, even if the accelerator pedal is stepped on, the fuel supply system will not supply fuel.
Working principleedit
Use a computer to control the engine speed. The car's computer will detect the speed. When the speed is reached, the engine will not be oiled. The speed limiter is part of the trip computer. The function of the electronic speed limit is to limit the speed of the car to prevent excessive speed The speed limit is based on the signal of the vehicle speed sensor and the engine speed signal to judge the working condition of your engine. The speed limit is also different according to different models. Generally 250km/h. This is preset by the computer to continue oil extraction after reaching this speed. The fuel supply system of the door pedal engine will no longer supply fuel. After the fuel supply speed drops, the fuel supply system returns to normal. The main reason is to protect the engine from overloading the engine and affect its service life.
1 The realization principle of speed limiter
Since the early cars did not have the speed limit function, the design should take into account the two different levels of installation before the car leaves the factory and the installation after the sale. The speed limiter should have a flexible installation method and not damage the integrity of the car. Sex and reliability. In order to design such a speed limiter, it is first necessary to understand the working principle of the automobile throttle system.
2 Hardware design of speed limiter
The general electronic automobile accelerator system includes: accelerator pedal, pedal sensor, electronic control unit (ECU), motor, throttle mechanism. The driver steps on the accelerator pedal according to the power required for driving. The accelerator pedal position sensor converts the collected accelerator pedal position signal into an electrical signal, and transmits it to the electronic control unit, which adjusts the throttle valve through the electric motor. , Achieve complete electronic control of the throttle.
Supported Features
(1) Analog signal acquisition, signal processing and signal output
The speed limiter needs to collect the electric signal of the accelerator pedal sensor, so it needs to have the analog signal collection function, and the collected signal is filtered, calculated and processed; at the same time, the speed limiter outputs the corresponding electric signal according to the result of the collected signal processing Provided to ECU, so it needs to have analog signal output function.　
(2) Control circuit
The speed limiter needs to realize the functions of the speed limiter working mode, alarm working mode and shutdown mode according to the user's instruction or in some abnormal conditions. When the speed limiter is in working mode, it not only needs to monitor the accelerator pedal sensor signal, but also realizes the speed limit control based on the pedal sensor signal and the preset upper limit of speed Vm; when in the alarm working mode, only need to monitor the accelerator pedal sensor signal , Combined with the preset upper limit of speed Vm, to achieve alarm when overspeed.
(3) Human-computer interaction function
The speed limiter must have the functions of human-computer interaction such as display, keyboard, voice alarm output, etc.