What role does the throttle bypass valve of EFI motorcycle play?

The throttle bypass valve of EFI motorcycle is used to connect the coarse filter and the fine filter. The bypass valve can prevent the oil from entering the fuel system, so as to ensure the normal lubrication of the whole engine. When idling, the throttle valve is completely closed, and the ECU supplied with gas by the bypass valve corrects the voltage supplied to the idling motor according to the signal of the sensor, and controls the ventilation of the bypass valve, thus achieving the purpose of stabilizing idling.

Working principle of bypass valve

The pressure reducing valve, that is, the intake bypass valve, is also commonly called the intake pressure reducing valve. It is installed on the intake pipe near the throttle. It is the original pressure relief device for most turbocharged engines when they leave the factory. Because the turbine is driven by the power of exhaust gas, when the throttle is closed during driving, the throttle is also closed.

The turbine blades continue to rotate under the action of inertia. At this time, due to the truncation of the throttle and the continuous pressurization of the blades, the air pressure in the intake pipe will rise rapidly. In order to protect the supercharging system, when the pressure reaches a certain limit value, the intake bypass valve is opened, and the excess air pressure is led back between the filter and the turbine to realize the function of depressurization protection.