Qi Jun stepped on the gas pedal and stopped at the tachometer.

There may be something wrong with the charging cable.

The failure of charging line may be caused by generator failure, battery voltage sensor failure, loose battery pile head and other reasons. Because the generator needs to charge the battery when the vehicle is running. When the battery can't be charged or is not fully charged, the engine ECU will increase the engine speed and let the generator charge the battery, causing the tachometer to go up and down while driving.

Throttle, also known as "throttle" and "throttle". Refers to the control device that controls the engine power (thrust). On the piston aero-engine, the throttle valve controls the opening of the carburetor to control the filling amount of the cylinder, thus determining the output power of the engine. On the gas turbine engine, the throttle valve controls the metered fuel flow of the fuel regulator, thus determining the thrust generated by the engine. The position of the throttle is controlled by the driver operating the throttle lever in the cockpit, and it is transmitted to the carburetor or fuel regulator on the engine through control system components such as pull rod, rocker arm, torsion tube, steel cable, pulley and sector wheel.