Engine torque controller
AssigneeVisteon Global Technologies, Inc.
InventorsGaron Nigel Heslop, Jon Dixon, Richard Stephen Blachford
Life of this patent
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Abstract
This invention relates to an engine torque controller for spark ignition internal combustion engines and more specifically for direct injection engines. The invention provides a torque controller and a method of controlling torque for an engine in which torque is controlled in dependence upon a filtered difference signal where the filtered difference signal is the difference between a desired torque signal and a signal representing an estimate of the current torque.
Claims7
A device for controlling a torque output of an engine, the device comprising:
- a torque demand controller for generating a torque demand signal;
- and
- a torque producer which receives the torque demand signal, the torque producer includes:
- an estimator which receives as inputs a current spark angle signal, a current air/fuel ratio signal and an estimated air charge signal and outputs an estimated torque signal;
- a comparator which receives as inputs the estimated torque signal and a desired torque signal and outputs a difference signal;
- a high pass filter which receives as an input the difference signal and outputs a filtered difference signal in which low frequency components are absent;
- and
- a transient torque controller which receives as an input the filtered difference signal and outputs a fuel adjustment signal and a spark adjustment signal.
A method for controlling a torque output of an engine, the method comprising:
- estimating a current torque signal from a received current spark angle signal, a received current air/fuel ratio signal and a received estimated air charge signal;
- comparing the estimated current torque signal with a desired torque signal to output a difference signal;
- filtering out a plurality of low frequency components from the difference signal;
- and
- controlling a fuel adjustment signal and a spark adjustment signal in dependence upon a filtered difference signal.
Dependencies are inferred from the claim text.