Normal is generally 500~800r/min
Too low engine is easy to shake, too high fuel consumption is high, as long as there is no shaking, design engineers want to as low as possible in order to save fuel. Idling speed will automatically increase by 50-150 RPM under the following conditions:
1, cold start, low water temperature;
2, battery loss;
3, open the air conditioning refrigeration.
Engine idle speed is one of engine operating conditions. GB18285-2005 “ignition engine vehicle exhaust emission limits and measurement methods (double idle method and simple working condition method)” : idle condition refers to the engine without load running state, that is, the clutch is in the combination position, the transmission is in neutral position (for automatic gearbox car should be in the “stop” or “P” gear position); In the car with carburetor oil supply system, the choke should be in the full open position; The accelerator pedal is in the fully released position.
The idle performance of engine has a great influence on the emission, fuel consumption and comfort, so the idle performance of engine is an important index to evaluate the engine performance. When idling, the engine is separated from the transmission system and the accelerator pedal is completely loosened, the engine only overcomes its own resistance to run, and there is no external output work. The engine idle speed is called idle speed, idle speed should not be too high or too low, too high will increase fuel consumption, too low will make the engine idle speed instability. The optimum idle speed is the lowest idle speed to ensure the stable operation of the engine. General vehicle diesel engine idling speed in 500~800r/min.
Post time: Jun-03-2021