Control method for a transmission in a vehicle
First Claim
1. A control method for a transmission in a vehicle, the method comprises:
- a shift-determination stage performed by a transmission control unit (TCU), the shift-determination stage including receiving the rpm of an engine from an rpm sensor and determining whether to perform shifting of gears depending on the received rpm;
wherein while the shifting of gears is determined in the shift-determination stage, an ECU-control stage allowing the TCU to control an engine control unit (ECU) to cut off fuel supplied to a combustion chamber by controlling a fuel injector and to release a clutch connecting an engine and a transmission;
wherein after the control action in the ECU-control stage, an engine-braking stage monitoring a change in pressure of engine cylinders and allowing engine braking action to be activated by controlling an exhaust valve to be opened; and
wherein while the rpm is reduced to a predefined value or less after the engine-braking stage, a shift-stage performing a shift action.
1 Assignment
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Accused Products
Abstract
A control method for a vehicle transmission includes, in a TCU, receiving the rpm of an engine from an rpm sensor and determining whether to perform shifting of gears depending on the received rpm, when the shifting of gears is determined, allowing the TCU to control an ECU to cut off fuel supplied to the engine combustion chamber and to release a clutch connecting the engine and the transmission, after the control action is performed, monitoring a change in pressure of engine cylinders and allowing engine braking action to be activated, and when the rpm is reduced to a predefined value or less after the engine braking action, performing a shifting action.
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Citations
6 Claims
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1. A control method for a transmission in a vehicle, the method comprises:
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a shift-determination stage performed by a transmission control unit (TCU), the shift-determination stage including receiving the rpm of an engine from an rpm sensor and determining whether to perform shifting of gears depending on the received rpm; wherein while the shifting of gears is determined in the shift-determination stage, an ECU-control stage allowing the TCU to control an engine control unit (ECU) to cut off fuel supplied to a combustion chamber by controlling a fuel injector and to release a clutch connecting an engine and a transmission; wherein after the control action in the ECU-control stage, an engine-braking stage monitoring a change in pressure of engine cylinders and allowing engine braking action to be activated by controlling an exhaust valve to be opened; and wherein while the rpm is reduced to a predefined value or less after the engine-braking stage, a shift-stage performing a shift action. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification