Is there any engine fault in fuel cut-off mode? How to judge the oil cut-off mode?

The dangerous speed of the engine is usually marked on the tachometer with a red area. When the pointer enters the red area, the engine usually stops fuel injection. If it is an automatic transmission model, it will automatically shift gears to reduce the engine speed. Therefore, when the engine is turned off, don't mistake it for something wrong with the engine. In addition, for the sake of your car, Bian Xiao suggested not to raise the engine speed too high. There are four main fuel cut-off protection modes of engine electronic control system: fast deceleration fuel cut-off, overspeed fuel cut-off, oil leakage elimination and torque reduction fuel cut-off.

The concept of idle speed of internal combustion engine is well understood, that is, the engine can promote the continuous operation of the engine crankshaft by burning the minimum intake air and fuel injection-or not let the crankshaft stop (stall). In the idle state, the user experience that the driver can restart the engine without repeatedly starting the engine will naturally be better, but it also reduces the wear and even fuel consumption of the starter; Because the fuel consumed by starting the engine is about equal to the idle speed of 8~ 10, the engine needs to run at idle speed. The dangerous speed of the engine is usually marked on the car tachometer with a red area. When the pointer enters the red area, the engine usually stops fuel injection.

The deceleration and fuel cut-off of automobile taxiing with gear need to match the forward gear, and high speed corresponds to high grade. With the gradual decline of vehicle speed, it is necessary to gradually downshift in the order of 5/4/3/2/ 1. Automatic transmission will automatically downshift, while manual transmission naturally requires manual operation. However, heavy trucks are not suitable for this operation, because the total mass of vehicles is high. On the contrary, you can skate in neutral for a longer distance. Compared with the fuel-saving ratio of sliding with gear without fuel injection, the actual consumption is less; But the real reason is to protect the gearbox and reduce the operation intensity.

According to the rated load, how much can this truck hold? Overload sliding with gear will damage the gearbox gear; In addition, heavy-duty manual trucks always have more than a dozen front gears, and the downshifting operation is too tired. When the computer detects that the engine speed exceeds the set maximum speed, it will automatically stop fuel injection to prevent the engine from being damaged due to excessive speed, that is, overspeed fuel cut-off. The computer will judge the comprehensive contribution according to the throttle position, engine speed and engine water temperature. Only when certain conditions are met can the deceleration and fuel cut-off mode be implemented.