Skip fire internal combustion engine control
First Claim
1. A method of determining firings during operation of an engine in a skip fire operational mode, the method comprising:
- receiving an input signal indicative of a desired engine output;
selectively determining working cycles to be fired and working cycles to be skipped, wherein the fired working cycles are arranged to deliver the desired engine output;
providing a torque feedback signal indicative of a torque; and
wherein the determination of the firings is based at least in part on the torque feedback signal.
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Accused Products
Abstract
A variety of methods and arrangements for controlling the operation of an internal combustion engine in a skip fire variable displacement mode are described. In one aspect, the working chamber firing that are selected to deliver the desired engine output are determined at least in part based on torque feedback. The torque feedback may be an indication of the torque output of the engine or the torque experienced at some other location in the drive train. In some embodiments, the torque feedback signal is filtered to remove high frequency components of the torque feedback signal in order to help stabilize the system. In another aspect, other operational parameters are used as feedback in the determination of the firing sequence. In yet another aspect, a filter is arranged to filter a feedback signal to provide a filtered feedback signal that is used in the determination of the working chamber firings.
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Citations
35 Claims
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1. A method of determining firings during operation of an engine in a skip fire operational mode, the method comprising:
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receiving an input signal indicative of a desired engine output; selectively determining working cycles to be fired and working cycles to be skipped, wherein the fired working cycles are arranged to deliver the desired engine output; providing a torque feedback signal indicative of a torque; and wherein the determination of the firings is based at least in part on the torque feedback signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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- 13. A controller for determining working cycle firings of an engine during operation of the engine in a skip fire operational mode, the controller comprising a control block that receives an input signal indicative of a desired output and is arranged to dynamically determine working chamber firings that deliver the desired output, wherein the control block is arranged to receive a torque feedback signal that is indicative of a torque associated with the engine and to determine the firings based at least in part on the torque feedback signal.
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25. A method of determining firings during operation of an engine in a skip fire operational mode, the method comprising:
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receiving an input signal indicative of a desired engine output; selectively determining working cycles to be fired and working cycles to be skipped, wherein the fired working cycles are arranged to deliver the desired engine output; providing a feedback signal selected from the group consisting of vehicle acceleration, wheel speed, wheel acceleration, speed of a component of a drive train and acceleration of a component of the drive train; and wherein the determination of the firings is based at least in part on the feedback signal. - View Dependent Claims (26, 27, 28, 29, 30, 31)
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32. A controller for determining firings during operation of an engine in a skip fire operational mode, wherein the controller includes:
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a converter that receives an input signal indicative of a desired output and is arranged to generate a digital converter output signal that is reflective of the input signal and oversampled relative to the firing opportunities of the engine; and a synchronizer that is synchronized with the firing opportunities of the engine, wherein the synchronizer decimates the digital converter output signal in a manner to produce a drive pulse signal that defines a firing sequence that delivers the desired output. - View Dependent Claims (33, 34, 35)
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Specification