Traditional Culture Encyclopedia - The 24 Solar Terms - Is the electronic throttle of the car good?
Is the electronic throttle of the car good?
The electronic throttle control system can accurately control the throttle opening, which can not only improve fuel economy and reduce emissions, but also make the system respond quickly and obtain satisfactory handling performance. On the other hand, it can realize the integration of idle speed control, cruise control and vehicle stability control and simplify the structure of the control system.
Disadvantages of electronic throttle:
(1) There will be throttle lag in auto start.
Automatic start needs to provide rich mixture, and ECU? According to the current vehicle speed, throttle opening, etc. From the point of view of fuel economy and reasonable emission, it will limit the opening range of throttle and fuel injection system to supply rich mixture. In fact, ECU limits the instantaneous output power of the engine, thus limiting the requirements for rich mixture during automatic start.
At present, most manufacturers use electronic accelerator to alleviate the throttle lag, but this device can not improve the engine performance, change the power output and torque. And it is only a signal amplifier, and the fuel consumption will increase with the acceleration of the throttle.
⑵ Nonlinear influence
There are all kinds of nonlinear influences in ETC control system, which are not only spring nonlinearity, stick-slip friction and backlash nonlinearity, but also the nonlinear damping force generated by intake air flow and the unstable turbulence resistance moment of intake air flow, which leads to the failure of conventional PID control to accurately set the feedback gain and affect the control accuracy.
(3) High cost.
ETC system adopts intelligent sensor, quick response actuator, high performance control unit and redundant design, which greatly increases the cost. At present, ETC system is only assembled on high-end cars.
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