Comparison of Electronic Throttle and Conventional Throttle

Electronic Throttle Advantages:

(1) The biggest advantage of the electronic throttle control system is that it allows for optimal torque output over the full range of the engine. (2) Precise control of throttle opening. Firstly, the ECU makes judgment and processing of various working condition information and sensor signals, then calculates the optimal throttle opening degree, and then the drive motor controls the throttle to achieve the corresponding throttle opening angle. (3) Improved engine emission performance: the ETC system precisely controls the air-fuel ratio under various conditions, which makes combustion more complete and also reduces the generation of exhaust gases; under idling, the throttle is kept at a very small opening angle to stabilize combustion, which improves fuel economy and emissions are further controlled. (4) Higher vehicle driving reliability. Electronic throttle control system using sensor redundancy design, from the control point of view, the use of a sensor can make the system operate normally, but the redundancy design can make the two sensors to detect each other, when a sensor failure can be recognized in a timely manner, to a large extent, increasing the reliability of the system, to ensure the safety of driving. (5) Different working modes can be selected. The driver can select different working modes through the mode switch according to different driving needs, usually there are three normal modes, power mode and snow mode, the difference lies in the different response speeds of the throttle to the accelerator pedal. (6) Altitude compensation is available. At higher altitudes, the atmospheric pressure drops, the air is thinner, and the oxygen content decreases, resulting in a decrease in engine output power. At this time, the electronic throttle control system can compensate for the throttle opening in accordance with the atmospheric pressure and altitude as a function of altitude to ensure that the relationship between the engine output power and the position of the gas pedal remains stable. Disadvantages of Electronic Throttle; (1) Throttle lag occurs when the car starts. The car needs to provide a thick mixture when starting, and the ECU will be analyzed according to the current speed, throttle opening, etc., from the point of view of fuel economy and reasonable emission considerations, will limit the throttle opening amplitude, and at the same time, limit the fuel injection system for a thick mixture of fuel supply, in fact, it is the ECU through the limitation of the engine instantaneous output power, which limits the car start requires a thicker mixture At present, the majority of manufacturers Through the electronic throttle gas pedal to ease the throttle lag, but this device does not improve engine performance, change the power output and torque, etc., is only a signal amplifier, and fuel consumption will increase with the gas pedal acceleration. (2) nonlinear effects ETC control system there are a variety of nonlinear effects, in addition to the spring nonlinear, stick-slip friction and tooth gap nonlinear and other effects, at the same time by the intake air flow generated by the nonlinear damping force as well as the intake air flow of the unstable disturbance of the flow of the resistance to the moment of influence, resulting in the conventional PID control can not be accurately set the feedback of the gain, affecting the control of the accuracy. (3) High cost. The ETC system adopts intelligent sensors, fast response actuators, high performance control units and redundant design, which increases the cost considerably, and at present the ETC system is only assembled in high-grade cars. Failure of traditional throttle general description of the composition of the electric throttle can be roughly divided into the following parts: throttle valve, solenoid driver, potentiometer, controller (some do not have, directly by the ecu pipe, bypass valve. Its failure characteristics are divided into two categories: hard failure and soft failure. Hard failure refers to mechanical damage, soft failure refers to dirty, out of tune, etc.. The resistive part of the hard fault potentiometer is made by spraying a layer of carbon film on a polyester substrate, which is actually a very low-grade preparation process with low abrasion resistance. To put it bluntly it's not as good as the potentiometers we normally add points to! The sliding contacts consist of a row of fine steel counter-jaws, note! It's the counter-jaws! This simply adds insult to injury! In addition, the charcoal film is not tinted with any protectant at all, and the charcoal dust that comes off causes poor contact, and bright lights are inevitable! Once repaired a charcoal film was scraped leak, only 70,000 kilometers, that master feet also owe! Soft Failure Everyone is often plagued by cleaning the throttle due to the fact that most of the time the throttle opening is too low. Air flows through the throttle gap at very high speeds (tens to hundreds of meters per second), and the gradual accumulation of dust has an effect on air flow that exceeds the regulating capacity of the throttle. The regulating ability of the valve. This is also my search on the Internet I hope to help you .