Hybrid electronic control unit for fuel management systems

Details Hybrid electronic control unit for fuel management systems Hybrid electronic control unit for fuel management systems

F - Mech Eng,Light,Heat,Weapons

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341/38.19

F02M 7/00 (2006.01) F02D 41/06 (2006.01) F02D 41/14 (2006.01) F02D 41/18 (2006.01) F02D 41/26 (2006.01) F02D 41/32 (2006.01)

Patent

CA 1121885

HYBRID ELECTRONIC CONTROL UNIT ABSTRACT OF THE DISCLOSURE A hybrid electronic control unit for regulating the air/fuel ratio of an internal combustion engine is disclosed. The electronic control unit is divided into two functionally distinct parts including an analog func- tion generator and a digital function generator. The analog function generator receives analog signals to pro- cess efficiently by analog scaling, amplification, multi- plication, and division while the digital function genera- tor receives digital and logic inputs to process effi- ciently by addition, subtraction, and comparison. The analog function generator interfaces with the digital function generator by an analog signal from a D/A con- verter and other unconverted digital output signals from the digital function generator. Preferably, the analog function generator provides an open loop air/fuel ratio calibration based upon a speed density calculation includ- ing special condition corrections to the base calibration. Primarily, the digital function generator is a micro- processor implemented closed loop integral controller pro- viding a closed loop correction signal to the open loop scheduler. The closed loop correction signal is provided from the digital function generator by a pair of cascaded digital integrators having different authority levels and integration rates. The cascade is formed by combining an asymmetric primary integrator waveform which has one RPM dependent ramp rate with a symmetric secondary integrator waveform which has a time dependent ramp rate. The primary integrator has a smaller authority and a faster ramp rate than the secondary integrator.

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