Electric motor for low speed supercharging of IC engine - is driven until speed has risen sufficiently for exhaust turbine to be effective, and is controlled by throttle position and engine speed

摘要

The automotive turbo-charger uses an auxiliary electric motor to drive the super-charger (3) when the engine speed is low and, consequently, the exhaust gas driven turbine (5) does not deliver sufficient power to be effective. The operation of the auxiliary electric motor (7) is controlled by two series switches, one (9) operated by the position of the throttle control, and the second (10) by a circuit which responds to engine speed. At low engine speed with small throttle opening the supercharging action is not required and the throttle position switch (9) remains open so the electric motor is not supplied. At high engine speeds the exhaust turbine is effective, and the speed switch (10) opens, removing supply from the electric motor.