Method and system for cutting fuel for hybrid vehicle
First Claim
1. A method for cutting fuel for a hybrid vehicle including an engine and first and second motor/generators as power sources, the method comprising:
- determining, by a control unit, a margin torque according to each driving mode;
determining, by a control unit, when a current vehicle driving condition is a coasting driving condition;
comparing, by the control unit, an engine torque and a sum of friction torque and the margin torque to determine whether the engine torque is greater than the sum of the friction torque and the margin torque; and
cutting fuel injection to the engine, by the control unit, when the engine torque is equal to or less than the sum of the friction torque and the margin torque.
1 Assignment
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Accused Products
Abstract
Disclosed is a method and a system for cutting fuel for a hybrid vehicle. More specifically, a control unit in the vehicle is configured to determine margin torque according to each driving mode, determine whether a current vehicle driving condition is a coasting driving condition, compare a engine torque and a sum of friction torque and the margin torque to determine whether the engine torque is greater than the sum of the friction torque and the margin torque and cut fuel injection to the engine when the engine torque is equal to or less than the sum of the friction torque and the margin torque.
15 Citations
20 Claims
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1. A method for cutting fuel for a hybrid vehicle including an engine and first and second motor/generators as power sources, the method comprising:
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determining, by a control unit, a margin torque according to each driving mode; determining, by a control unit, when a current vehicle driving condition is a coasting driving condition; comparing, by the control unit, an engine torque and a sum of friction torque and the margin torque to determine whether the engine torque is greater than the sum of the friction torque and the margin torque; and cutting fuel injection to the engine, by the control unit, when the engine torque is equal to or less than the sum of the friction torque and the margin torque. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for cutting fuel for a hybrid vehicle including an engine and first and second motor/generators as power sources, the system comprising:
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a first planetary gear unit comprising a first sun gear, a first ring gear connected with the first motor/generator, and a first carrier connected with the engine; a second planetary gear unit comprising a second sun gear, a second sun gear connected with the second motor/generator and the first sun gear, and a second carrier transferring output torque to an output shaft; a first brake selectively stopping rotation of the first motor/generator and the first ring gear; a first clutch selectively connecting the first carrier with the first ring gear; a second clutch selectively connecting the first carrier with the second ring gear; a second brake selectively configured to stop rotation of the second ring gear; a battery electrically connected with the first and second motor/generators; an accelerator pedal position sensor configured to detect a position of an accelerator pedal; a brake pedal position sensor configured to detect a position of a brake pedal; a state of charge (SOC) detector configured to detect a SOC of the battery; a vehicle speed detector configured to detect a vehicle speed; and a control unit configured to receive corresponding signals from the accelerator pedal position sensor, brake pedal position sensor, SOC detector, and vehicle speed detector, and controls operations of the engine and the first and second motor/generators, determine margin torque according to each driving mode, determine whether a current vehicle driving condition is a coasting driving condition, compare a engine torque and a sum of friction torque and the margin torque to determine whether the engine torque is greater than the sum of the friction torque and the margin torque, and stop fuel injection to the engine when the engine torque is equal to or less than the sum of the friction torque and the margin torque. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A non-transitory computer readable medium containing program instructions executed by a processor or controller, the computer readable medium comprising:
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program instructions that determine a margin torque according to each driving mode; program instructions that determine when a current vehicle driving condition is a coasting driving condition; program instructions that compare an engine torque and a sum of friction torque and a margin torque to determine whether the engine torque is greater than the sum of the friction torque and the margin torque; and program instructions that cuts fuel injection to the engine when the engine torque is equal to or less than the sum of the friction torque and the margin torque.
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16. A control unit for a hybrid vehicle, the controller configured to:
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determine a margin torque according to each driving mode, determine when a current vehicle driving condition is a coasting driving condition; compare an engine torque and a sum of friction torque and a margin torque to determine whether the engine torque is greater than the sum of the friction torque and the margin torque; and cut fuel injection to the engine when the engine torque is equal to or less than the sum of the friction torque and the margin torque. - View Dependent Claims (17, 18, 19, 20)
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Specification