Turbocharged engine control system
First Claim
1. A control system for controlling a spark-ignition internal combustion engine having an inlet manifold and an induction system for controlling a supply of a combustible mixture to the engine, the induction system including an engine throttle, said control system comprising signal generating means responsive to an engine output demand signal for generating a manifold pressure demand signal representing a demanded inlet manifold pressure, and control means responsive to the manifold pressure demand signal for controlling the engine throttle of the induction system so as to reduce a difference between the demanded inlet manifold pressure and an actual inlet manifold pressure, said control means including positioning means for controlling a position of the engine throttle and compression control means for controlling air compression so as to reduce the difference between the demanded inlet manifold pressure and the actual inlet manifold pressure, said positioning means including a throttle angle look-up table addressed by the manifold pressure demand signal.
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Accused Products
Abstract
An engine control system generates a manifold pressure demand signal from an engine output demand signal provided by an accelerator pedal position transducer or a cruise control. The manifold pressure demand signal is compared with the actual inlet manifold pressure and the difference used to control an engine throttle and a turbocharger by means of a waste gate.
41 Citations
19 Claims
- 1. A control system for controlling a spark-ignition internal combustion engine having an inlet manifold and an induction system for controlling a supply of a combustible mixture to the engine, the induction system including an engine throttle, said control system comprising signal generating means responsive to an engine output demand signal for generating a manifold pressure demand signal representing a demanded inlet manifold pressure, and control means responsive to the manifold pressure demand signal for controlling the engine throttle of the induction system so as to reduce a difference between the demanded inlet manifold pressure and an actual inlet manifold pressure, said control means including positioning means for controlling a position of the engine throttle and compression control means for controlling air compression so as to reduce the difference between the demanded inlet manifold pressure and the actual inlet manifold pressure, said positioning means including a throttle angle look-up table addressed by the manifold pressure demand signal.
- 14. A control system for controlling a spark-ignition internal combustion engine having an inlet manifold and are pressurized induction system for controlling a supply of a combustible mixture to the engine, the induction system including an engine throttle, said control system comprising signal generating means responsive to an engine output demand signal for generating a manifold pressure demand signal representing a demanded inlet manifold pressure, and control means responsive to the manifold pressure demand signal for controlling the engine throttle of the induction system so as to reduce a difference between the demanded inlet manifold pressure and an actual inlet manifold pressure, said control means including throttle control means for controlling a position of an engine throttle so as to reduce the difference between the demanded inlet manifold pressure and the actual inlet manifold pressure, said throttle control means comprising closed loop throttle control means for providing closed loop control of the engine throttle and open loop compression control means for providing open loop control of air compression based on demanded inlet manifold pressure.
Specification