The working principle of silent start of motorcycle (called pulse start in Honda motorcycle),

ACG starter motor is used: this integrated device is directly installed at the crankshaft end, which has the functions of both starter and engine. This new ACG starting motor technology can realize a smooth start and directly drive the engine.

When working as a starter motor, the magnetic flux from the magnet acts between the stator and the rotor. When the current passes through the stator coil, a strong magnetic flux is generated in the stator core, generating enough torque to meet the requirements of engine starting.

during electric starting, the battery directly supplies power to the magneto. After the motor rotates to drive the engine to start, the starting circuit is disconnected. At this time, the ACG magneto has the same function as the ordinary magneto. Because there is no gear meshing mechanism, it will not produce the obvious starting noise of ordinary starter, which is the origin of silent starting.

as the core component of the automatic start-stop system, because it abandons the mechanical meshing mechanism of the traditional magneto, the failure rate is greatly reduced and the efficiency is greatly improved when it is frequently started.

Extended information

Motorcycle consists of five parts: engine, transmission system, running system, steering and braking system and electrical instrumentation equipment. The overall structure of motorcycle and the names of its components.

Characteristics of motorcycle engine

(1) The engine is a two-stroke or four-stroke gasoline engine.

(2) air cooling is adopted, including natural air cooling and forced air cooling. The general model adopts the natural air cooling method that relies on the air blowing over the cylinder head and the radiator on the cylinder liner to take away the heat. In order to ensure the cooling of the high-power motorcycle engine at low speed and before driving, the forced air cooling method is adopted, which is equipped with a fan and an air guide cover, and the cooling fins are cooled by forced air.

(3) The engine speed is high, generally above 5 rpm. The rising power (the effective power per liter of engine displacement) is large, generally around 6 kW/liter. This shows that the motorcycle engine has a high degree of reinforcement and a small overall size.

(4) The engine crankcase, clutch and gearbox are integrated and compact.