Vehicle and sliding feedback control system of vehicle and method for the same

• US 9,902,291 B2
• Filed: 09/05/2014
• Issued: 02/27/2018
• Est. Priority Date: 09/09/2013
• Status: Active Grant

• Current Assignee: BYD Company Limited
• Original Assignee: BYD Company Limited
• Inventors: Cheng, Hua, Chen, Hao, Ruan, Ou
• Primary Examiner(s): Smith, Jelani
• Assistant Examiner(s): Martinez Borrero, Luis A
• Application Number:
  US14/917,884
• Publication Number:
  US 20160221469A1
• Time in Patent Office: 1,271 Days
• Field of Search: 701 22, 701 70, 701 93, 701102, 701104, 701 36
• CPC Class Codes: B60K 2006/4825 Electric machine connected or connectable to gearbox input shaft
• CPC Class Codes: B60K 6/442 Series-parallel switching type
• CPC Class Codes: B60K 6/48 Parallel type
• CPC Class Codes: B60L 15/2045 for optimising the use of energy
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2240/425 Temperature
• CPC Class Codes: B60L 2250/28 Accelerator pedal thresholds
• CPC Class Codes: B60L 3/108 whilst braking, i.e. ABS
• CPC Class Codes: B60L 58/12 responding to state of charge [SoC]
• CPC Class Codes: B60L 7/18 Controlling the braking effect B60L7/12, B60L7/14, B60L7/16 take precedence
• 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 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 2510/087 Temperature
• CPC Class Codes: B60W 2510/1005 Transmission ratio engaged
• CPC Class Codes: B60W 2510/18 Braking system
• CPC Class Codes: B60W 2510/244 Charge state
• CPC Class Codes: B60W 2510/246 Temperature
• CPC Class Codes: B60W 2520/10 Longitudinal speed
• CPC Class Codes: B60W 2540/10 Accelerator pedal position
• CPC Class Codes: B60W 2552/15 : Road slope, i.e. the inclination of a road segment in the longitudinal direction
• CPC Class Codes: B60W 2710/083 : Torque
• CPC Class Codes: B60W 30/18127 : Regenerative braking
• CPC Class Codes: B60Y 2200/92 : Hybrid vehicles
• CPC Class Codes: B60Y 2300/143 : Speed control
• CPC Class Codes: B60Y 2300/18175 : Preventing, or responsive to skidding of wheels
• CPC Class Codes: B60Y 2300/43 : Control of engines
• CPC Class Codes: B60Y 2300/60 : Control of electric machines, e.g. problems related to electric motors or generators
• CPC Class Codes: B60Y 2400/301 : for position or displacement
• CPC Class Codes: B60Y 2400/302 : Temperature sensors
• CPC Class Codes: B60Y 2400/303 : Speed sensors
• CPC Class Codes: B60Y 2400/81 : Braking systems
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles
• CPC Class Codes: Y02T 10/64 : Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 : Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/72 : Electric energy management in electromobility
• CPC Class Codes: Y10S 903/93 : Conjoint control of different elements

Abstract

A sliding feedback control system of a vehicle is provided. The system includes: an electric motor; a power battery; a battery manager connected with the power battery, and configured to obtain a maximum charging power of the power battery; and a motor controller connected with the electric motor, and configured to obtain maximum feedback torque values of the motor controller and the electric motor, to convert the maximum charging power of the power battery into a maximum feedback torque value of the power battery, to determine a minimum of the maximum feedback torque values as a first feedback torque value, to obtain a second feedback torque value, and to determine a final feedback torque value of the electric motor as a minimum of the first and second feedback torque values, such that the electric motor controls the vehicle to perform the sliding feedback operation according to the final feedback torque value.

Claims

1. A sliding feedback control system of a vehicle, comprising:

an electric motor;

a power battery configured to supply power to the electric motor;

a battery manager, connected with the power battery, and configured

to obtain a current state of the power battery, and

to obtain a maximum charging power of the power battery according to the current state of the power battery; and

a motor controller, connected with the electric motor, and configured

to obtain current states of the motor controller and the electric motor,

to obtain maximum feedback torque values of the motor controller and the electric motor respectively according to the current states of the motor controller and the electric motor,

to convert the max charging power of the power battery into a maximum feedback torque value of the power battery,

to determine a first feedback torque value, wherein the first feedback torque value is a first minimum value of (i) the maximum feedback torque value of the power battery, (ii) the maximum feedback torque value of the motor controller, and (iii) the maximum feedback torque value of the electric motor,

to obtain a second feedback torque value according to a current speed of the vehicle, a current road slope value, a current working mode of the vehicle, and a predetermined sliding feedback torque curve, and

to determine a final feedback torque value of the electric motor, wherein the final feedback torque value of the electric motor is a second minimum value of (i) the first feedback torque value and (ii) the second feedback torque value, such that the electric motor is configured to control the vehicle to perform a sliding feedback operation according to the final feedback torque value of the electric motor.

2. The system of claim 1, further comprising:

an electronic speed controller, connected with the motor controller, and configured to sample the current speed of the vehicle;

a throttle depth sensor, connected with the motor controller, and configured to sample a current accelerator pedal depth value;

a shift control unit, connected with the motor controller, and configured to sample a current gear signal of the vehicle; and

a temperature sensor, connected with the power battery, the electric motor, and the motor controller respectively, and configured to sample temperature values of the power battery, the electric motor and the motor controller.

3. The system of claim 2, wherein the current state of the power battery comprises an electric quantity and a temperature of the power battery.

4. The system of claim 2, wherein the current state of the motor controller comprises a temperature of the motor controller.

5. The system of claim 2, wherein the current state of the electric motor comprises a temperature of the electric motor and a position of a motor rotor.

6. The system of claim 2, wherein the motor controller is further configured to:

sample the current road slope value and obtain the current working mode of the vehicle, state information of an anti-lock braking system and state information of a cruise control system; and

determine whether the vehicle is permitted to enter a sliding feedback state according to the current speed of the vehicle, the current accelerator pedal depth value, the current gear signal of the vehicle, the state information of the anti-lock braking system and the state information of the cruise control system.

7. The system of claim 6, wherein the vehicle is permitted to enter the sliding feedback state when following conditions are satisfied:

the current speed of the vehicle sampled by the electronic speed controller is larger than or equal to a minimum vehicle speed threshold;

the current accelerator pedal depth value sampled by the throttle depth sensor is zero;

the anti-lock braking system is in a non-working state;

the cruise control system is in the non-working state; and

the current gear signal sampled by the shift control unit is a D gear signal.

8. The system of claim 6, wherein the motor controller is configured to determine whether the vehicle is permitted to exit the sliding feedback state according to the current speed of the vehicle, the current accelerator pedal depth value, the current gear signal of the vehicle, the state information of the anti-lock braking system and the state information of the cruise control system.

9. The system of claim 8, wherein the vehicle is permitted to exit the sliding feedback state when one of following conditions is satisfied:

the current speed of the vehicle sampled by the electronic speed controller is less than the minimum vehicle speed threshold;

the current accelerator pedal depth value sampled by the throttle depth sensor is larger than zero;

the anti-lock braking system is in a working state;

the cruise control system is in the working state; and

the current gear signal sampled by the shift control unit is a non-D gear signal.

10. The system of claim 1, further comprising:

an engine control module configured to control an output torque of an engine according to a target torque signal of the engine sent by the motor controller.

11. The system of claim 1, further comprising:

a combination instrument configured to display power state information of the vehicle.

12. A vehicle, comprising a sliding feedback control system of claim 1.

13. A sliding feedback control method of a vehicle, comprising:

obtaining a current state of a power battery and obtaining a maximum charging power of the power battery according to the current state of the power battery;

obtaining current states of a motor controller and an electric motor, and obtaining maximum feedback torque values of the motor controller and the electric motor respectively according to the current states of the motor controller and the electric motor;

converting the maximum charging power of the power battery into a maximum feedback torque value of the power battery;

obtaining a first minimum value of (i) the maximum feedback torque value of the power battery, (ii) the maximum feedback torque value of the motor controller, and (iii) the maximum feedback torque value of the electric motor, and setting a first feedback torque value as the first minimum value;

obtaining a second feedback torque value according to a current speed of the vehicle, a current road slope value, a current working mode of the vehicle and a predetermined sliding feedback torque curve;

obtaining a second minimum value of (i) the first feedback torque value and (ii) the second feedback torque value, and setting a final feedback torque value of the electric motor as the second minimum value; and

controlling the vehicle to perform a sliding feedback operation according to the final feedback torque value of the electric motor.

14. The method of claim 13, further comprising:

sampling the current speed of the vehicle;

sampling a current accelerator pedal depth value;

sampling a current gear signal of the vehicle;

sampling the current road slope value and obtaining the current working mode of the vehicle, state information of an anti-lock braking system and state information of a cruise control system; and

determining whether the vehicle is permitted to enter a sliding feedback state according to the current speed of the vehicle, the current accelerator pedal depth value, the current gear signal of the vehicle, the state information of the anti-lock braking system and the state information of the cruise control system.

15. The method of claim 14, wherein the vehicle is permitted to enter the sliding feedback state when following conditions are satisfied:

the current speed of the vehicle is larger than or equal to a minimum vehicle speed threshold;

the current accelerator pedal depth value is zero;

the anti-lock braking system is in a non-working state;

the cruise control system is in the non-working state; and

the current gear signal is a D gear signal.

16. The method of claim 14, further comprising:

determining whether the vehicle is permitted to exit the sliding feedback state according to the current speed of the vehicle, the current accelerator pedal depth value, the current gear signal of the vehicle, the state information of the anti-lock braking system and the state information of the cruise control system.

17. The method of claim 16, wherein the vehicle is permitted to exit the sliding feedback state when one of following conditions is satisfied:

the current speed of the vehicle is less than the minimum vehicle speed threshold;

the current accelerator pedal depth value is larger than zero;

the anti-lock braking system is in a working state;

the cruise control system is in the working state; and

the current gear signal is a non-D gear signal.

18. The method of claim 13, further comprising:

sampling temperature values of the power battery, the electric motor and the motor controller.

19. The method of claim 13, further comprising:

sampling the current road slope value by the motor controller.

20. The method of claim 13, further comprising:

controlling an output torque of an engine according to a target torque signal of the engine sent by the motor controller.