Method and code for controlling reactivation of deactivatable cylinder using torque error integration
First Claim
1. A method for controlling a reactivation of a given deactivated cylinder of a multi-displacement internal combustion engine, the method comprising:
- determining, while operating the engine in a partial-displacement mode characterized by deactivation of the given cylinder, a torque request based at least in part on a driver demand signal;
estimating a maximum potential output torque for the engine when operating in a partial-displacement mode based at least in part on a first engine operating parameter;
calculating a difference by which the torque request exceeds the maximum potential output torque;
integrating the calculated differences over time to obtain a torque request error measure; and
initiating a switch from the partial-displacement mode to a full-displacement mode characterized by activation of the deactivatable cylinder when the torque request error measure is not less than a first threshold value.
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Abstract
In an internal combustion engine adapted to operate in a cylinder-deactivation mode, a method for controlling the reactivation of a deactivated cylinder includes determining a difference between a torque request from a vehicle operator, and an estimate of a maximum engine torque achievable in cylinder-deactivation mode based at least in part on a current engine speed. The difference is integrated over time to obtain a torque request “error.” A reactivation of the deactivated cylinder is triggered when the torque request error exceeds a first threshold value, which can be a calibrated value, a calibrated value adapted, for example, for driving style, or a value determined from a vehicle operating parameter such as vehicle speed. The use of the torque request error advantageously avoids reactivation of the deactivated cylinders in response to brief transients in the torque request signal that otherwise temporarily exceed the maximum achievable engine output torque.
87 Citations
14 Claims
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1. A method for controlling a reactivation of a given deactivated cylinder of a multi-displacement internal combustion engine, the method comprising:
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determining, while operating the engine in a partial-displacement mode characterized by deactivation of the given cylinder, a torque request based at least in part on a driver demand signal; estimating a maximum potential output torque for the engine when operating in a partial-displacement mode based at least in part on a first engine operating parameter; calculating a difference by which the torque request exceeds the maximum potential output torque; integrating the calculated differences over time to obtain a torque request error measure; and initiating a switch from the partial-displacement mode to a full-displacement mode characterized by activation of the deactivatable cylinder when the torque request error measure is not less than a first threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A computer-readable storage medium including computer executable code for controlling a reactivation of a given deactivated cylinder of a multi-displacement internal combustion engine, the storage medium including:
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code for determining, while the engine is operating in a partial-displacement mode, a torque request based at least in part on a driver demand signal; code for estimating a maximum potential output torque for the engine in the cylinder-deactivation mode based at least in part on a first engine operating parameter; code for calculating a difference by which the torque request exceeds the maximum potential output torque; code for integrating the calculated differences over time to obtain a torque request error measure; and code for initiating a switch from the partial-displacement mode to a full-displacement mode characterized by activation of the deactivatable cylinder when the torque request error measure is not less than a first threshold value. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification