Is Haifuxing idle speed 900 normal?

According to the above situation, this situation is normal because the engine control unit controls the idle speed as follows:

1. Idle speed control function at engine start.

When the engine is started, the air intake is very small because the throttle is closed. In order to make the engine easy to start, the idle speed control function can maximize the amount of bypass air to improve the starting performance of the engine. After the engine is started, the electronic control unit adjusts the air intake according to the temperature of cooling water, thus stabilizing and controlling the idling operation of the engine.

2. Idle speed control during engine warm-up.

During the heating period after the engine is started, the idle speed control system gradually adjusts the air intake to the air intake level determined by the cooling water temperature, so that the engine is in the best idle running state.

3. Idle speed control after engine preheating.

After the engine is warmed up, the idle speed control system detects the engine load by receiving the output signal of each sensor. The signals received by the idle speed control system include automatic transmission neutral signal, which is used to indicate the current gear and whether the air conditioner is turned on. Then, according to these conditions, the idle speed control system calculates the optimal idle speed, and carries out feedback control according to the difference between the actual engine speed and the calculated optimal idle speed, so as to change the intake air volume and gradually narrow the speed difference until the engine idle speed reaches the calculated optimal value.

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