Vehicle control system

• US 9,895,994 B2
• Filed: 04/08/2015
• Issued: 02/20/2018
• Est. Priority Date: 04/10/2014
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Morimoto, Youhei
• Primary Examiner(s): Skibinski, Thomas
• Application Number:
  US14/681,253
• Publication Number:
  US 20150291051A1
• Time in Patent Office: 1,049 Days
• Field of Search: 307 91, 307 101, 320103, 320104
• CPC Class Codes: B60K 6/442 Series-parallel switching type
• CPC Class Codes: B60K 6/547 the transmission being a stepped gearing
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60L 53/24 Using the vehicle's propulsion converter for charging
• CPC Class Codes: B60L 58/13 Maintaining the SoC within a determined range
• CPC Class Codes: B60W 10/00 Conjoint control of vehicle sub-units of different type or different function for propulsion of purely electrically-propelled vehicles with power supplied within the vehicle B60L50/00 - B60L58/00
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 10/26 for electrical energy, e.g. batteries or capacitors
• CPC Class Codes: B60W 20/13 in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion
• CPC Class Codes: B60W 20/14 in conjunction with braking regeneration
• CPC Class Codes: B60W 2050/0075 Automatic parameter input, automatic initialising or calibrating means
• CPC Class Codes: B60W 2510/244 Charge state
• CPC Class Codes: B60W 2510/246 Temperature
• CPC Class Codes: B60W 2510/305 Power absorbed by auxiliaries
• CPC Class Codes: B60W 2556/10 Historical data
• CPC Class Codes: B60W 2710/086 Power
• CPC Class Codes: B60W 2710/244 Charge state
• CPC Class Codes: B60W 2710/248 Current for loading or unloading
• CPC Class Codes: B60W 30/18127 Regenerative braking
• CPC Class Codes: H02J 7/007194 : of the battery
• CPC Class Codes: H02J 7/1423 : with multiple batteries
• CPC Class Codes: H02J 7/1446 : in response to parameters of a vehicle
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles
• CPC Class Codes: Y02T 10/70 : Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 : Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/92 : Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles
• CPC Class Codes: Y02T 90/14 : Plug-in electric vehicles

Abstract

The vehicle control system includes an engine, a battery, a motor generator that generates driving power and generates electric power to charge the battery, a power conversion device that generates driving power to the motor generator and charges the battery, and a control device that controls the engine and the power conversion device. The control device controls the engine and the power conversion device and the remaining capacity of the battery is equal to a target value when the remaining capacity of the battery is equal to or less than the lower threshold. The control device reduces the target value of the remaining value of the battery as compared with a case where temperature of the battery is equal to or more than a threshold value when the temperature of the battery is less than the threshold value.

Claims

1. A vehicle control system comprising:

an engine mounting to a vehicle and burning a fuel to generate driving power;

a battery enabling to charge and discharge;

a motor generator being supplied with electric power from the battery to generate driving power, and being supplied with the driving power from the engine to generate electric power and charge the battery;

a power conversion device converting the electric power supplied from the battery and supplying to the motor generator to generate the driving power in the motor generator, and converting the electric power generated by the motor generator and supplying to the battery to charge the battery; and

a control device controlling the engine and the power conversion device,

wherein;

when a remaining capacity of the battery is equal to or less than a low limit threshold, the control device controls the engine and the power conversion device so as to make the remaining capacity of the battery reach a target value;

when a temperature of the battery is less than a threshold value, the control device reduces the target value of the remaining capacity of the battery compared with a case where the temperature of the battery is equal to or more than the threshold value; and

the control device sets the target value of the remaining capacity of the battery based on the temperature of the battery, and corrects the target value that has been set based on the temperature of the battery, further based on electric power generated by regenerative operation of the motor generator to generate a corrected target value.

2. The vehicle control system according to claim 1, wherein

the control device sets the target value of the remaining capacity of the battery based on an index regarding a travelling pattern of the vehicle.

3. The vehicle control system according to claim 2, wherein

the control device sets the target value of the remaining capacity of the battery based on the index regarding the travelling pattern of the vehicle in a past or a future.

4. The vehicle control system according to claim 2, wherein

the index regarding the travelling pattern of the vehicle corresponds to at least one of average vehicle speed, average vehicle drive output, and average vehicle acceleration and deceleration.

5. The vehicle control system according to claim 1, wherein

the control device sets the target value of the remaining capacity of the battery based on input power of the battery and output power of the battery.

6. The vehicle control system according to claim 5, further comprising:

a power supply source supplying electric power to the battery,

wherein

the input power of the battery corresponds to the electric power that is supplied to the battery from the motor generator and corresponds to the electric power that is supplied to the battery from the power supply source.

7. The vehicle control system according to claim 5, further comprising

an electric load being supplied with the electric power from the battery to operate,

wherein

the output power of the battery corresponds to the electric power that is supplied to the motor generator from the battery and corresponds to the electric power that is supplied to the electric load from the battery.

8. The vehicle control system according to claim 7, wherein

the electric load corresponds to at least one of an electric compressor, a blower fan, and an electric heater.

9. The vehicle control system according to claim 1, wherein

the control device calculates the electric power generated by the regenerative operation of the motor generator based on an index regarding a travelling pattern of the vehicle.

10. The vehicle control system according to claim 9, wherein

the control device calculates the electric power generated by the regenerative operation of the motor generator based on the index regarding the travelling pattern of the vehicle in a past or future.

11. The vehicle control system according to claim 9, wherein

the index regarding the travelling pattern of the vehicle corresponds to at least one of average vehicle speed, average vehicle drive output, and average vehicle acceleration and deceleration.

12. The vehicle control system according claim 1, further comprising:

a low voltage battery that receives the electric power from the battery,

wherein the vehicle is provided by a hybrid vehicle that uses the engine and the motor generator to generate the driving power.