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US 6,083,138 AGranted
Hybrid drive control system for vehicle
AssigneeNissan Motor Co., Ltd.
InventorsShunichi Aoyama, Shinichiro Kitada, Noboru Hattori, Isaya Matsuo
Life of this patent
Estimating the term…
Abstract
A hybrid vehicle propulsion system comprises an electric motor as a first propulsion source, an engine as a second propulsion source and a continuously variable transmission for receiving an input rotation from at least one of the motor and engine and for delivering a driving torque to a drive axle of the vehicle. A controller controls a transmission ratio of the transmission so that the transmission ratio in a motor drive mode is higher than the transmission ratio in an engine drive mode.
Claims16
A hybrid drive control system for a hybrid vehicle, the hybrid drive control system comprising:
- a hybrid propulsion system comprising an internal combustion engine, an electric motor, a clutch which comprises an input member connected with the engine and an output member connected with the motor, and a continuously variable transmission which comprises an input member connected with the output member of the clutch and an output member for delivering a driving force to a drive axle of the vehicle;
- and
- a controller setting a transmission ratio of the continuously variable transmission higher when the clutch is disengaged than when the clutch is engaged.
A hybrid drive control system for a hybrid vehicle, the hybrid drive control system comprising:
- a parallel hybrid propulsion system comprising an electric motor, an internal combustion engine and a variable speed transmission comprising an input member connected with the motor and the engine and an output member delivering an axle driving torque to drive the hybrid vehicle;
- a vehicle operating condition sensor sensing a vehicle operating condition;
- and
- a controller discriminating a first vehicle operating region and a second vehicle operating region by monitoring the vehicle operating condition, setting the hybrid propulsion system in a first drive mode for driving the vehicle with the motor in the first vehicle operating region and in a second drive mode for driving the vehicle with the engine in the second vehicle operating region, and further setting a transmission ratio of the transmission higher in the first vehicle operating region than in the second vehicle operating region, and wherein the controller decreases the transmission ratio of the transmission gradually after a vehicle drive mode of the hybrid vehicle is switched from the first drive mode to the second drive mode.
1 more element
A hybrid drive control system for a hybrid vehicle, the hybrid drive control system comprising:
- a parallel hybrid propulsion system comprising an electric motor, an internal combustion engine and a variable speed transmission comprising an input member connected with the motor and the engine and an output member delivering an axle driving torque to drive the hybrid vehicle;
- a vehicle operating condition sensor sensing a vehicle operating condition;
- and
- a controller discriminating a first vehicle operating region and a second vehicle operating region by monitoring the vehicle operating condition, setting the hybrid propulsion system in a first drive mode for driving the vehicle with the motor in the first vehicle operating region and in a second drive mode for driving the vehicle with the engine in the second vehicle operating region, and further setting a transmission ratio of the transmission higher in the first vehicle operating region than in the second vehicle operating region;
- wherein the parallel hybrid propulsion system further comprises a clutch comprising an input member connected with the engine and an output member connected with the motor and the input member of the transmission, the variable speed transmission is a continuously variable transmission, the transmission ratio is a speed ratio of an input speed to an output speed of the transmission, and the controller sets the transmission ratio of the transmission higher in the first drive mode than in the second drive mode;
- and
- wherein the controller comprises:
- a first section for detecting a predetermined condition by monitoring the vehicle operating condition;
- a second section for operating the hybrid propulsion system in a vehicle drive mode which is set to the first drive mode for driving the vehicle with a driving force of the motor when the predetermined condition is not detected and to the second drive mode for driving the vehicle with a driving force of the engine when the predetermined condition is detected;
- and
- a third section for decreasing the transmission ratio of the transmission when the vehicle drive mode is changed from the first drive mode to the second drive mode.
8 more elements
A hybrid drive control system for a hybrid vehicle, the hybrid drive control system comprising:
- a parallel hybrid propulsion system comprising an electric motor, an internal combustion engine and a variable speed transmission comprising an input member connected with the motor and the engine and an output member delivering an axle driving torque to drive the hybrid vehicle;
- a vehicle operating condition sensor sensing a vehicle operating condition;
- and
- a controller discriminating a first vehicle operating region and a second vehicle operating region by monitoring the vehicle operating condition, setting the hybrid propulsion system in a first drive mode for driving the vehicle with the motor in the first vehicle operating region and in a second drive mode for driving the vehicle with the engine in the second vehicle operating region, and further setting a transmission ratio of the transmission higher in the first vehicle operating region than in the second vehicle operating region, and wherein the first operating region is a region in which an output of the motor is greater than an output of the engine, and the second operating region is a region in which the output of the engine is greater than the output of the motor.
1 more element
A hybrid drive control system for a hybrid vehicle, the hybrid drive control system comprising:
- a parallel hybrid propulsion system comprising an electric motor, an internal combustion engine and a variable speed transmission comprising an input member connected with the motor and the engine and an output member delivering an axle driving torque to drive the hybrid vehicle;
- a vehicle operating condition sensor sensing a vehicle operating condition;
- and
- a controller discriminating a first vehicle operating region and a second vehicle operating region by monitoring the vehicle operating condition, setting the hybrid propulsion system in a first drive mode for driving the vehicle with the motor in the first vehicle operating region and in a second drive mode for driving the vehicle with the engine in the second vehicle operating region, and further setting a transmission ratio of the transmission higher in the first vehicle operating region than in the second vehicle operating region;
- and
- wherein the sensor comprises a revolution sensor for sensing a source speed which is one of a motor speed of the motor and an engine speed of the engine, the first operating region is a region in which the source speed is lower than a predetermined speed, and the second operating region is a region in which the source speed is greater than the predetermined speed.
3 more elements
A hybrid drive control method for a parallel hybrid propulsion system comprising an electric motor, an internal combustion engine and a variable speed transmission comprising an input member connected with the motor and the engine and an output member delivering an axle driving torque to drive a hybrid vehicle, the control method comprising:
- sensing a vehicle operating condition;
- discriminating a first vehicle operating region and a second vehicle operating region by monitoring the vehicle operating condition;
- operating the parallel hybrid propulsion system in a first drive mode for driving the vehicle with the motor in the first vehicle operating region and in a second drive mode for driving the vehicle with the engine in the second vehicle operating region;
- and
- setting a transmission ratio of the transmission higher in the first vehicle operating region than in the second vehicle operating region;
- and
- wherein the first operating region is a region in which an output of the motor is greater than an output of the engine and the second operating region is a region in which the output of the engine is greater than the output of the motor.
4 more elements
A hybrid drive control method for a parallel hybrid propulsion system comprising an electric motor, an internal combustion engine and a variable speed transmission comprising an input member connected with the motor and the engine and an output member delivering an axle driving torque to drive a hybrid vehicle, the control method comprising:
- sensing a vehicle operating condition;
- discriminating a first vehicle operating region and a second vehicle operating region by monitoring the vehicle operating condition;
- operating the parallel hybrid propulsion system in a first drive mode for driving the vehicle with the motor in the first vehicle operating region and in a second drive mode for driving the vehicle with the engine in the second vehicle operating region;
- and
- setting a transmission ratio of the transmission higher in the first vehicle operating region than in the second vehicle operating region;
- and
- wherein the step of setting the transmission ratio comprises an operation of decreasing the transmission ratio of the continuously variable transmission when a vehicle drive mode is changed from the first drive mode to the second drive mode.
4 more elements
A hybrid drive control system for a hybrid vehicle, the hybrid drive control system comprising;
- first energy supplying means for supplying mechanical energy to propel a hybrid vehicle by converting electrical energy into the mechanical energy;
- second energy supplying means for supplying mechanical energy to propel the hybrid vehicle by converting energy of fuel into the mechanical energy;
- changing means for changing over a vehicle drive mode between a first drive mode for propelling the vehicle with the mechanical energy supplied from the first energy supplying means and a second drive mode for propelling the vehicle with the mechanical energy supplied from the second energy supplying means;
- speed varying means for receiving an input rotation from one of the first and second energy supplying means, for delivering an output rotation for driving the vehicle, and for continuously varying a transmission ratio of an input speed of the input rotation to an output speed of the output rotation;
- monitoring means for monitoring a first vehicle operating parameter to detect a predetermined condition;
- setting means for setting the changing means in a first state for achieving the first drive mode when the predetermined condition is not detected and in a second state for achieving the second drive mode when the predetermined condition is detected, and
- decreasing means for decreasing the transmission ratio of the speed varying means when the vehicle drive mode is changed from the first drive mode to the second drive mode.
4 more elements
A hybrid drive control system for a hybrid vehicle, the hybrid drive control system comprising:
- a parallel hybrid propulsion system comprising an internal combustion engine, an electric motor, a clutch comprising an input member connected with the engine, and an output member connected with the motor, a continuously variable transmission comprising an input member connected with the output member of the clutch;
- a sensor for sensing a vehicle operating condition;
- and
- a controller for discriminating a first vehicle operating region and a second vehicle operating region by monitoring the vehicle operating condition, for controlling the parallel hybrid propulsion system in a first operating mode using the motor as a primary propulsion source for normally driving the vehicle in the first vehicle operating region and in a second operating mode using the engine as the primary propulsion source in the second vehicle operating region and for controlling an actual transmission ratio of the continuously variable transmission to a first target transmission ratio in the first operating mode, and to a second target transmission ratio which is lower than the first target transmission ratio in the second operating mode;
- and
- wherein the sensor comprises a revolution sensor for sensing a source speed which is one of a motor speed of the motor and an engine speed of the engine, the first operating region is a region in which the source speed is lower than a predetermined speed, and the second operating region is a region in which the source speed is greater than the predetermined speed.
3 more elements
Dependencies are inferred from the claim text.