Damping of engine torque oscillations - using controllable filter parameters in electronic circuit for fuel injectors

摘要

The fuel injection circuit has a controller (15) receiving input from speed and air-quantity sensors (14,3) and outputting through a filter (20) to a multiplier (19). Here, a signal from the lambda sensor (11) is combined. The resultant signal passes to the pulse modulator (16). To prevent hunting, the filter parameters are adjustable through the control unit (21), receiving input from the tacho (22), speed sensor and throttle angle sensor (11). The filter transfer function has quadratic numerator and denominator, the time constants and damping parameters of the denominator being higher than those of the numerator. USE/ADVANTAGE - Damping the torque oscillation of a vehicle; allows good matching of filter behaviour to the engine and drive train.