System and method for controlling a transmission to improve exhaust braking
First Claim
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1. A system for controlling a transmission of a vehicle powered by an engine, comprising:
- a torque determination module that determines a desired exhaust brake torque for the engine based on an actual speed of the vehicle and a desired speed of the vehicle;
a shift determination module that determines whether to shift between gear ratios of the transmission based on whether the desired exhaust brake torque is greater than or equal to a predetermined amount of an exhaust brake torque capacity of the engine at a current engine speed; and
a speed determination module that determines the desired speed of the vehicle based on driver input during a predetermined period, wherein the driver input includes acceleration and braking of the vehicle.
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Abstract
A system for controlling a transmission of a vehicle powered by an engine includes a torque determination module and a shift determination module. The torque determination module determines a desired exhaust brake torque for the engine based on an actual speed of the vehicle and a desired speed of the vehicle. The shift determination module determines whether to shift between gear ratios of the transmission based on the desired exhaust brake torque and an exhaust brake torque capacity of the engine.
14 Citations
18 Claims
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1. A system for controlling a transmission of a vehicle powered by an engine, comprising:
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a torque determination module that determines a desired exhaust brake torque for the engine based on an actual speed of the vehicle and a desired speed of the vehicle; a shift determination module that determines whether to shift between gear ratios of the transmission based on whether the desired exhaust brake torque is greater than or equal to a predetermined amount of an exhaust brake torque capacity of the engine at a current engine speed; and a speed determination module that determines the desired speed of the vehicle based on driver input during a predetermined period, wherein the driver input includes acceleration and braking of the vehicle. - View Dependent Claims (2, 3)
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4. A system for controlling a transmission of a vehicle powered by an engine, comprising:
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a torque determination module that determines a desired exhaust brake torque for the engine based on an actual speed of the vehicle and a desired speed of the vehicle; and a shift determination module that determines whether to shift between gear ratios of the transmission based on whether the desired exhaust brake torque is greater than or equal to a predetermined amount of an exhaust brake torque capacity of the engine at a current engine speed, wherein the shift determination module upshifts between gear ratios of the transmission when vehicle acceleration is greater than a vehicle acceleration threshold or when exhaust brake torque after an upshift is less than the exhaust brake torque capacity of the engine. - View Dependent Claims (5, 6, 7, 8, 9)
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10. A method for controlling a transmission of a vehicle powered by an engine, comprising:
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using a torque determination module, determining a desired exhaust brake torque for the engine based on an actual speed of the vehicle and a desired speed of the vehicle; using a shift determination module, determining whether to shift between gear ratios of the transmission based on whether the desired exhaust brake torque is greater than or equal to a predetermined amount of an exhaust brake torque capacity of the engine at a current engine speed; and using a speed determination module, determining the desired speed of the vehicle based on driver input during a predetermined period, wherein the driver input includes acceleration and braking of the vehicle. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification