Method for controlling an engine for a motor vehicle
First Claim
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1. A method for controlling an engine of a motor vehicle having an engine driven transmission providing a number of gear ratios, comprising:
- controlling the engine in response to a torque request;
setting an acceleration limit based upon at least a current gear ratio;
estimating a current road load for the motor vehicle;
setting a maximum torque request limit based upon the estimated road load and the acceleration limit;
reducing the torque request from a demanded torque request to the maximum torque request limit if the demanded torque request exceeds the maximum torque request limit; and
reducing the torque request from the demanded torque request to a modified torque request if the demanded torque request exceeds a torque request limit that is lower than the maximum torque request limit.
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Abstract
A method for controlling the operation of an engine of a vehicle is disclosed in which a torque request signal supplied to control the supply of torque from the engine is adaptively modified based upon a desired maximum acceleration limit for the currently engaged gear and variations in the sum of forces resisting motion of the vehicle.
25 Citations
20 Claims
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1. A method for controlling an engine of a motor vehicle having an engine driven transmission providing a number of gear ratios, comprising:
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controlling the engine in response to a torque request; setting an acceleration limit based upon at least a current gear ratio; estimating a current road load for the motor vehicle; setting a maximum torque request limit based upon the estimated road load and the acceleration limit; reducing the torque request from a demanded torque request to the maximum torque request limit if the demanded torque request exceeds the maximum torque request limit; and reducing the torque request from the demanded torque request to a modified torque request if the demanded torque request exceeds a torque request limit that is lower than the maximum torque request limit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for controlling operation of an engine of a motor vehicle having an engine driven transmission providing a number of gear ratios, the system comprising:
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a main processor arranged to receive information regarding a current operating state of the engine and the current operating state of the motor vehicle, including current gear ratio and; an engine control processor to control the operation of the engine in response to a torque request from the main processor, wherein the main processor is operable to set an acceleration limit for the motor vehicle based upon at least the current gear ratio, estimate a current road load for the motor vehicle, and set a maximum torque request limit based upon the estimated road load and the acceleration limit and, if a demanded torque request is greater than the maximum torque request limit, the main processor is operable to reduce the demanded torque request to the maximum torque request limit and the main processor is further operable to reduce the demanded torque request to a modified torque request if the demanded torque request exceeds a torque request limit that is lower than the maximum torque request limit. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A method, comprising:
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limiting torque to a first level below that requested when above a maximum threshold request, where the maximum threshold increases with increasing road load, and a degree of limiting is reduced with higher road load and increased with higher discrete transmission gear ratios; and limiting torque to a second level below that requested and the first level when above a second threshold request, the second threshold less than the maximum threshold.
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Specification