Four-wheel drive electric vehicle control device

Patent metadata

Field	Value
Publication number	US-2016229392-A1
Application number	US-201315025313-A
Country	US
Kind code	A1
Filing date	Oct 10, 2013
Priority date	Oct 10, 2013
Publication date	Aug 11, 2016
Grant date	—

Abstract

A four-wheel drive electric vehicle control device is provided for a four-wheel drive electric vehicle that has a motor/generator as a drive source, and an electronically controlled coupling provided on the drive power transmission path leading from the drive source to the front and rear wheels. The four-wheel drive hybrid vehicle has a 4WD control unit that outputs to the electronically controlled coupling a transmission torque command value to bring about the four-wheel drive state, in accordance with the vehicle state. The 4WD control unit has a regenerative control intervention-coordinating controller that, when regenerative control by the motor/generator has intervened during the four-wheel drive state, brings the transmission torque of the electronically controlled coupling to zero before initiating regenerative control.

First claim

1 . A four-wheel drive electric vehicle control device for a four-wheel drive electric vehicle, in which a drive source has a motor/generator, and an electronically controlled coupling is provided on a drive power transmission path leading from a drive source to front and rear wheels, which controls the power distribution of the front and rear wheels by a command from the outside, the four-wheel drive electric vehicle control device comprising:
a four-wheel drive power distribution control unit programmed to output to the electronically controlled coupling a transmission torque command value to bring about a four-wheel drive state, in accordance with the vehicle state, the four-wheel drive power distribution control unit including a regenerative control intervention-coordinating controller programmed such that, when regenerative control by the motor/generator has intervened during the four-wheel drive state, brings a transmission torque of the electronically controlled coupling to zero before initiating regenerative control.

2 . The four-wheel drive electric vehicle control device according to claim 1 , further comprising:
a hybrid control module programmed to output a regenerative torque command value to the motor/generator in accordance with a brake depression operation amount at a time of a brake operation, wherein the four-wheel drive power distribution control unit is programmed to output the transmission torque command value that changes a front and rear wheel transmission torque in accordance with an accelerator depression operation amount at a time of an accelerator operation to the electronically controlled coupling, and the regenerative control intervention-coordinating controller is programmed to set the transmission torque of the electronically controlled coupling to zero before starting regenerative control by the motor/generator, at the time of a brake depression operation after an accelerator releasing operation.

3 . The four-wheel drive electric vehicle control device according to claim 2 , wherein
the four-wheel drive power distribution control unit comprises a transmission torque instruction section programmed to reduce the transmission torque command value with a predetermined response delay, when reducing the transmission torque command value following a reduction in the accelerator operation amount, and the regenerative control intervention-coordinating controller is programmed to output a regenerative control intervention prediction determination signal when a regenerative vehicle speed condition and an accelerator position opening condition are satisfied, and when a regenerative control intervention prediction determination signal is outputted, a decrease gradient of the transmission torque command value from the transmission torque instruction section is set to be a higher gradient than a normal-time decrease gradient having a response delay.

4 . The four-wheel drive electric vehicle control device according to claim 3 , wherein
the regenerative control intervention-coordinating controller is programmed to output the regenerative control inhibition request for a predetermined period of time after an output of the regenerative control intervention prediction determination signal, and when a regenerative vehicle speed condition is satisfied when the brake is depressed, the regenerative control intervention-coordinating controller is programmed to delay starting of the regenerative control by the motor/generator while the regenerative control inhibition request is being outputted.

5 . The four-wheel drive electric vehicle control device according to claim 3 , wherein
the four-wheel drive power distribution control unit is programmed to perform an initial torque control based on vehicle speed, a differential rotation torque control based on a differential rotation between the front and rear wheels, and a drive force distribution torque control based on an accelerator position opening amount, and when a regenerative control intervention prediction determination signal is outputted, the regenerative control intervention-coordinating controller is programmed to cut the initial torque control and the differential rotation torque control, and when a predetermined time has elapsed since the output of a command value to set the transmission torque of the electronically controlled coupling to zero, the cutting of the initial torque control and the differential rotation torque control is released, and returned to a normal control.

6 . The four-wheel drive electric vehicle control device according to claim 1 , wherein
the electronically controlled coupling is a coupling comprising a control clutch that is engaged by a current value from outside to s solenoid, a cam mechanism configured from a ball that is sandwiched between cam grooves formed in a control cam and a main cam, and a main clutch that is engaged via the cam mechanism.

7 . The four-wheel drive electric vehicle control device according to claim 4 , wherein
the four-wheel drive power distribution control unit is programmed to perform an initial torque control based on vehicle speed, a differential rotation torque control based on a differential rotation between the front and rear wheels, and a drive force distribution torque control based on an accelerator position opening amount, and when a regenerative control intervention prediction determination signal is outputted, the regenerative control intervention-coordinating controller is programmed to cut the initial torque control and the differential rotation torque control, and when a predetermined time has elapsed since the output of a command value to set the transmission torque of the electronically controlled coupling to zero, the cutting of the initial torque control and the differential rotation torque control is released, and returned to a normal control.

8 . The four-wheel drive electric vehicle control device according to claim 2 , wherein
the electronically controlled coupling is a coupling comprising a control clutch that is engaged by a current value from outside to s solenoid, a cam mechanism configured from a ball that is sandwiched between cam grooves formed in a control cam and a main cam, and a main clutch that is engaged via the cam mechanism.

9 . The four-wheel drive electric vehicle control device according to claim 3 , wherein
the electronically controlled coupling is a coupling comprising a control clutch that is engaged by a current value from outside to s solenoid, a cam mechanism configured from a ball that is sandwiched between cam grooves formed in a control cam and a main cam, and a main clutch that is engaged via the cam mechanism.

10 . The four-wheel drive electric vehicle control device according to claim 4 , wherein
the electronically controlled coupling is a coupling comprising a control clutch that is engaged by a current value from outside to s solenoid, a cam mechanism configured from a ball that is sandwiched between cam grooves formed in a control cam and a main cam, and a main clutch that is engaged via the cam mechanism.

11 . The four-wheel drive electric vehicle control device according to claim 5 , wherein
the electronically controlled coupling is a coupling comprising a control clutch that is engaged by a current value from outside to s solenoid, a cam mechanism configured from a ball that is sandwiched between cam grooves formed in a control cam and a main cam, and a main clutch that is engaged via the cam mechanism.

Assignees

• Nissan Motor

Inventors

• Sugitani Osamu
• Tanaka Koutarou
• Nakamura Keishirou
• Myochin Toshiyuki

Classifications

• B60L53/53

  Batteries · CPC title

• B60K6/445

  Differential gearing distribution type · CPC title

• B60K6/365

  with the gears having orbital motion · CPC title

• B60L2260/28

  Four wheel or all wheel drive · CPC title

• B60W10/10

  including control of change-speed gearings · CPC title