Method of varying vehicle engine braking torque using full authority active fuel management
First Claim
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1. A method of varying vehicle engine braking torque using full authority active fuel management control with deceleration fuel cutoff comprising:
- determining if a vehicle'"'"'s accelerator pedal position is decreasing;
determining if the transmission has upshifted to the highest gear according to shift pattern when the accelerator pedal position is decreasing;
controlling the vehicle to enter active fuel management and deceleration fuel cutoff when the transmission is in the highest gear;
detecting if vehicle tow mode has been requested;
disabling active fuel management and deceleration fuel cutoff on all engine cylinders if vehicle tow mode has been requested; and
disabling active fuel management and deceleration fuel cutoff on at least one engine cylinder based on vehicle speed and brake pedal position when vehicle tow mode has not been requested.
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Abstract
A method for intelligent active engine braking using full authority active fuel management based on vehicle speed and brake pedal position. The method includes determining if the tow mode of the vehicle has been selected and enables all engine cylinders to ensure maximum engine braking capacity is available. When vehicle tow mode is not selected then the method varies engine braking capacity by disabling one or more cylinders based on the vehicle speed and brake pedal position.
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Citations
13 Claims
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1. A method of varying vehicle engine braking torque using full authority active fuel management control with deceleration fuel cutoff comprising:
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determining if a vehicle'"'"'s accelerator pedal position is decreasing; determining if the transmission has upshifted to the highest gear according to shift pattern when the accelerator pedal position is decreasing; controlling the vehicle to enter active fuel management and deceleration fuel cutoff when the transmission is in the highest gear; detecting if vehicle tow mode has been requested; disabling active fuel management and deceleration fuel cutoff on all engine cylinders if vehicle tow mode has been requested; and disabling active fuel management and deceleration fuel cutoff on at least one engine cylinder based on vehicle speed and brake pedal position when vehicle tow mode has not been requested. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification