Patent ID: 6044643
Filing Date: 2000-04-04
Classification: F01N,F02D,F02M,Y02A

Abstract:
An engine control system comprising:a mass air flow sensor (62) in an air intake path for a vehicle engine (44) and providing a first input signal indicative of mass air flow through the mass air flow sensor;an air pump unit (72) having an inlet (68) coupled between the mass air flow sensor and the vehicle engine and an outlet (76) coupled in a path of exhaust from the vehicle engine, wherein the air pump unit is controllable to pump secondary air from the inlet to the outlet;a first estimator (154) responsive to a set of measured engine parameters for providing a second input signal indicative of mass air flow into the intake manifold (40); anda first actuator, responsive to a first control command, controlling at least one function of a set of functions comprising: (a) fuel into the vehicle engine and (b) secondary air provided to the outlet of the air pump unit; anda control unit (12) including a first control command generator (152, 162) providing the first control command responsive to a difference between the first and second input signals, wherein improved control of chemistry and equivalence ratio of gases entering a catalytic converter (90) is achieved.