Vehicle and shifting control method and power transmission system thereof
First Claim
1. A shifting control method for a vehicle comprising:
- detecting operating parameters of the vehicle, wherein the operating parameters of the vehicle comprises vehicle speed, vehicle acceleration as reflected from an accelerator-pedal signal, and a current gear of the vehicle;
determining a work mode of the vehicle; and
performing speed adjustment and shifting control to a first motor-generator of the vehicle configured to rotate together with a motor shaft of the vehicle according to the operating parameters of the vehicle and work modes to implement shifting control of the vehicle, wherein the motor shaft of the vehicle is configured to rotate together with one of input shafts, wherein the work modes comprises an electric-vehicle mode and a hybrid-electric-vehicle mode, and wherein when the work mode of the vehicle is the electric-vehicle mode, performing speed adjustment and shifting control to the first motor-generator comprises;
controlling, by an electromotor controller, to perform a first unloading of torque to the first motor-generator, after determining that a request gear sent by the electromotor controller is the same as a target gear sent by a transmission control unit;
after the first unloading of torque of the first motor-generator is finished, controlling, by the transmission control unit, a motor shaft synchronizer of the power transmission system to disconnect according to a motor speed adjustment request sent by the electromotor controller, and when the first motor-generator is at neutral, calculating, by the electromotor controller, a target shifting rotational speed of the first motor-generator and controlling, by the electromotor controller, to perform loading of torque to the first motor-generator to perform speed adjustment until a rotational speed of the first motor-generator reaches a preset rotational speed range;
controlling, by the electromotor controller, to perform a second unloading of torque to the first motor-generator until the second unloading of torque of the first motor-generator is finished, controlling, by the transmission control unit, the motor shaft synchronizer to start connecting according to the request gear sent by the electromotor controller and feeding back, by the transmission control unit, whether the request gear of the electromotor controller is shifted successfully; and
determining, by the electromotor controller, that the current gear of the first motor-generator sent by the transmission control unit is the request gear, and determining, by the electromotor controller, that the first motor-generator is shifted successfully.
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Accused Products
Abstract
The present disclosure discloses a shifting control method for a hybrid vehicle. The shifting control method includes: detecting operating parameters of the hybrid vehicle, where the operating parameters of the hybrid vehicle includes vehicle speed, vehicle acceleration as reflected from an accelerator-pedal signal and a current gear of the hybrid vehicle; determining a work mode of the hybrid vehicle; performing speed adjustment and shifting control to the first motor-generator according to a work mode and the operating parameters of the hybrid vehicle to implement shifting control of the hybrid vehicle, where the work mode includes an electric-vehicle mode and a hybrid-electric-vehicle mode. The method considers performing speed adjustment and shifting control under various working conditions. This improves smoothness and comfort of the vehicle and enlarges the use scope. The present disclosure further discloses a power transmission system of a hybrid vehicle and a hybrid vehicle.
69 Citations
16 Claims
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1. A shifting control method for a vehicle comprising:
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detecting operating parameters of the vehicle, wherein the operating parameters of the vehicle comprises vehicle speed, vehicle acceleration as reflected from an accelerator-pedal signal, and a current gear of the vehicle; determining a work mode of the vehicle; and performing speed adjustment and shifting control to a first motor-generator of the vehicle configured to rotate together with a motor shaft of the vehicle according to the operating parameters of the vehicle and work modes to implement shifting control of the vehicle, wherein the motor shaft of the vehicle is configured to rotate together with one of input shafts, wherein the work modes comprises an electric-vehicle mode and a hybrid-electric-vehicle mode, and wherein when the work mode of the vehicle is the electric-vehicle mode, performing speed adjustment and shifting control to the first motor-generator comprises; controlling, by an electromotor controller, to perform a first unloading of torque to the first motor-generator, after determining that a request gear sent by the electromotor controller is the same as a target gear sent by a transmission control unit; after the first unloading of torque of the first motor-generator is finished, controlling, by the transmission control unit, a motor shaft synchronizer of the power transmission system to disconnect according to a motor speed adjustment request sent by the electromotor controller, and when the first motor-generator is at neutral, calculating, by the electromotor controller, a target shifting rotational speed of the first motor-generator and controlling, by the electromotor controller, to perform loading of torque to the first motor-generator to perform speed adjustment until a rotational speed of the first motor-generator reaches a preset rotational speed range; controlling, by the electromotor controller, to perform a second unloading of torque to the first motor-generator until the second unloading of torque of the first motor-generator is finished, controlling, by the transmission control unit, the motor shaft synchronizer to start connecting according to the request gear sent by the electromotor controller and feeding back, by the transmission control unit, whether the request gear of the electromotor controller is shifted successfully; and determining, by the electromotor controller, that the current gear of the first motor-generator sent by the transmission control unit is the request gear, and determining, by the electromotor controller, that the first motor-generator is shifted successfully. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A power transmission system of a vehicle, comprising:
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a plurality of input shafts, a gear driving gear being set on each of the input shafts; a plurality of output shafts, a gear driven gear being set on each of the output shafts, the gear driven gear meshing with the gear driving gear correspondingly; a motor shaft, the motor shaft being configured to rotate together with one of the input shafts; a first motor-generator, the first motor-generator being configured to rotate together with the motor shaft; a detecting module configured to detect operating parameters of the vehicle, wherein the operating parameters of the vehicle comprises a vehicle speed, vehicle acceleration as reflected from an accelerator-pedal signal and a current gear of the vehicle; an electromotor controller configured to perform speed adjustment and shifting control to the first motor-generator according to work mode and the operating parameters of the vehicle to implement shifting control of the vehicle, wherein the work modes comprises an electric-vehicle mode and a hybrid-electric-vehicle mode; and a transmission control unit, the transmission control unit communicating with the electromotor controller by a communication network of the vehicle, wherein when the work mode of the vehicle is the electric-vehicle mode, if the electromotor controller determines that the first motor-generator needs to be performed the shifting control according to the vehicle speed, the vehicle acceleration and the current gear of the hybrid vehicle, the electromotor controller performing speed adjustment and shifting control to the first motor-generator comprises; when a request gear sent by the electromotor controller is the same as a target gear sent by the transmission control unit, the electromotor controller controlling to perform a first unloading of torque to the first motor-generator; after the first unloading of torque of the first motor-generator is finished, the transmission control unit controlling a motor shaft synchronizer of the power transmission system to disconnect according to a motor speed adjustment request sent by the electromotor controller, and when the first motor-generator is at neutral, the electromotor controller calculating a target shifting rotational speed of the first motor-generator and controlling to perform loading of torque to the first motor-generator to perform speed adjustment until a rotational speed of the first motor-generator reaches a preset rotational speed range; the electromotor controller controlling to perform a second unloading of torque to the first motor-generator until the second unloading of torque of the first motor-generator is finished, the transmission control unit controlling the motor shaft synchronizer to start connecting according to the request gear sent by the electromotor controller and feeding back whether the request gear of the electromotor controller is shifted successfully; and the electromotor controller determining that the current gear of the first motor-generator sent by the transmission control unit is the request gear, the electromotor controller determining that the first motor-generator is shifted successfully. - View Dependent Claims (14, 15, 16)
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Specification