# US 10,246,077 B2 · Vehicle regenerative speed control device

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- Number: US 10,246,077 B2
- Document ID: US10246077B2
- Status: Granted
- Kind: B2
- Application number: 15/559,097
- Filed: 2015-03-20
- Published: 2018-08-30
- Granted: 2019-04-02
- Earliest claimed: 2015-03-20
- Assignees: Nissan Motor Co., Ltd.
- Applicants: Nissan Motor Co., Ltd.
- Inventors: Takanobu Mouri; Takahiro Yoshino; Yuuzou Kageyama; Masashi Ono; Hideki Maruyama; Takuya Ishizuka
- Web page: https://patentgrep.com/patent/US10246077B2

## CPC

- B60W 20/14: in conjunction with braking regeneration
- B60K 6/543: the transmission being a continuously variable transmission
- B60W 10/06: including control of combustion engines
- B60W 10/08: including control of electric propulsion units, e.g. motors or generators
- B60W 10/107: with endless flexible members
- B60W 10/184: with wheel brakes
- B60W 10/196: acting within the driveline, e.g. retarders
- B60W 10/26: for electrical energy, e.g. batteries or capacitors
- B60W 10/30: including control of auxiliary equipment, e.g. air-conditioning compressors or oil pumps
- B60W 20/30: Control strategies involving selection of transmission gear ratio {(control of change speed gearings, together with other vehicle sub-units B60W10/10; HEV transmission gearing B60K6/36; gearings and control thereof F16H)}
- B60W 30/18127: {Regenerative braking}
- B60W 30/20: Reducing vibrations in the driveline
- F16H 61/04: Smoothing ratio shift
- B60K 2006/4825: {Electric machine connected or connectable to gearbox input shaft}
- B60W 2520/10: Longitudinal speed
- B60W 2540/12: Brake pedal position
- B60W 2710/082: Speed change rate
- B60W 2710/1005: Transmission ratio engaged
- B60W 2710/1011: Input shaft speed, e.g. turbine speed
- B60W 2710/1016: Input speed change rate
- B60W 2710/1038: Output speed
- B60W 2720/106: Longitudinal acceleration
- B60Y 2300/19: Improvement of gear change, e.g. synchronisation or smoothing gear shift
- B60Y 2300/89: Repartition of braking force, e.g. friction braking versus regenerative braking
- Y02T 10/62: Hybrid vehicles
- Y10S 903/918: Continuously variable
- Y10S 903/947: Characterized by control of braking, e.g. blending of regeneration, friction braking
- B60W: CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- F16H: GEARING
- B60Y: INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A vehicle regenerative speed control device is provided that includes a controller which performs a regenerative speed control for downshifting a belt-type continuously variable transmission to the low gear ratio side and increasing a rotational speed of a transmission input shaft to which a motor generator is connected when there is a request for an increase in the regeneration amount while decelerating. The controller also imposes the limitation of staying within a Pri end command rotational speed change rate for the Pri end command rotational speed when performing a regenerative speed control for increasing the Pri end command rotational speed based on a braking operation in a brake switching region for switching from regenerative braking to hydraulic braking due to a decrease in vehicle speed.

## Claims

### Claim 1

A vehicle regenerative speed control device for a vehicle having
a continuously variable transmission including a transmission input shaft,
a mechanical brake system, and
an electric motor that is connected to the transmission input shaft and that regenerates energy during deceleration,
the vehicle regenerative speed control device comprising:
a controller configured to execute a cooperative regenerative control with respect to a requested braking force, the cooperative braking control providing the requested braking force as a sum of a regenerative braking force generated by the electric motor and a mechanical braking force generated by the mechanical brake system,
the controller being configured such that when the requested braking force increases during the cooperative regenerative control, the controller performs a regenerative speed control to downshift the continuously variable transmission to a lower gear and increase a rotational speed of the transmission input shaft, and
during the cooperative braking control, the controller being configured to determine whether the vehicle is in a regenerative braking region in which the vehicle speed is larger than a brake switching start vehicle speed or a brake switching region in which the vehicle speed is smaller than or equal to a brake switching start vehicle speed and larger than or equal to a brake switching end vehicle speed that is smaller than the brake switching start vehicle speed,
the controller being configured to execute the regenerative speed control such that a rotational speed change rate of the transmission input shaft is smaller when carrying out the regenerative speed control in the brake switching region than when carrying out the regenerative speed control in the regenerative braking region.

### Claim 2 (depends on 1)

The vehicle regenerative speed control device according to claim 1, wherein
an oil pump is provided, which is connected to the transmission input shaft,
the controller sets a rotational speed of the transmission input shaft at which the oil pump produces a necessary hydraulic pressure to the continuously variable transmission during deceleration as a lower-limit rotational speed,
the controller sets a target rotational speed characteristic of the regenerative braking in which a target rotational speed of the transmission input shaft determined based on regenerative efficiency first rises and then decreases toward the lower-limit rotational speed with time, and
the controller accomplishes making the rotational speed change rate of the transmission input rotational speed smaller in the brake switching region by imposing a limitation on a transmission input rotational speed command value used by the regenerative speed control to make the rotational speed of transmission input shaft follow the target rotational speed characteristic when a brake depression operation or an additional brake pedal depression operation is carried out in the brake switching region.

### Claim 3 (depends on 2)

The vehicle regenerative speed control device according to claim 2, wherein
the controller limits the transmission input rotational speed command value such that the rotational speed change rate of the transmission input shaft is less than or equal to a shock-allowable change rate, the shock-allowable change rate being a rotational speed change rate at which an inertia shock due to fluctuation of a vehicle deceleration G accompanying a change in the rotational speed of the transmission input shaft is.

### Claim 4 (depends on 3)

The vehicle regenerative speed control device according to claim 3, wherein
when carrying out the regenerative speed control in the brake switching region, the controller imposes limits a command rotational speed change rate to a value that is less than or equal to a change rate obtained by subtracting a target rotational speed change rate of the target rotational speed characteristic from the shock-allowable change rate.