Hybrid electrical vehicle and method for controlling same

• US 10,077,040 B2
• Filed: 09/03/2014
• Issued: 09/18/2018
• Est. Priority Date: 09/09/2013
• Status: Active Grant

• Current Assignee: BYD Company Limited
• Original Assignee: BYD Company Limited
• Inventors: Chen, Hao, Ruan, Ou
• Primary Examiner(s): Badii, Behrang
• Assistant Examiner(s): Testardi, David A
• Application Number:
  US14/917,895
• Publication Number:
  US 20160221571A1
• Time in Patent Office: 1,476 Days
• 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 20/10 Controlling the power contribution of each of the prime movers to meet required power demand
• 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 20/15 Control strategies specially adapted for achieving a particular effect
• CPC Class Codes: B60W 20/40 Controlling the engagement or disengagement of prime movers, e.g. for transition between prime movers power-up or power-down of the driveline B60W30/192
• CPC Class Codes: B60W 2510/244 Charge state
• CPC Class Codes: B60W 2710/0666 Engine torque
• CPC Class Codes: B60W 2710/0677 Engine power
• CPC Class Codes: B60W 2710/086 Power
• CPC Class Codes: B60W 2710/244 Charge state
• CPC Class Codes: B60W 30/182 Selecting between different operative modes, e.g. comfort and performance modes
• CPC Class Codes: B60W 30/1882 characterised by the working point of the engine, e.g. by using engine output chart
• CPC Class Codes: Y02T 10/40 Engine management systems
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y02T 10/84 Data processing systems or methods, management, administration
• CPC Class Codes: Y10S 903/93 Conjoint control of different elements

Abstract

A control system of a hybrid electrical vehicle and a control method for a hybrid electrical vehicle are provided. The control system of the hybrid electric vehicle includes: a transmission device connected with wheels of the hybrid electrical vehicle; an engine power subsystem connected with the transmission device; a motor power subsystem connected with the transmission device; and a control module configured to control the hybrid electrical vehicle to operate in a hybrid electrical-economical mode by controlling the engine power subsystem and the motor power subsystem.

Claims

1. A control system for a hybrid electrical vehicle, comprising:

a transmission device connected with wheels of the hybrid electrical vehicle;

an engine power subsystem connected with the transmission device;

a motor power subsystem connected with the transmission device; and

a control module configured to;

control the hybrid electrical vehicle to operate in a corresponding work state by controlling the engine power subsystem and the motor power subsystem, wherein the work state comprises an electrical mode and a hybrid electrical mode;

determine whether a first maximum allowable discharge power of a power battery of the motor power subsystem is less than or equal to a first power threshold;

determine whether a first electric quantity of the power battery is less than or equal to a first electric quantity threshold;

in response to determining that the first maximum allowable discharge power of the power battery of the motor power subsystem is less than or equal to the first power threshold, or the first electric quantity of the power battery is less than or equal to the first electric quantity threshold, switch to the hybrid electrical mode from the electrical mode, wherein the electrical mode comprises an electrical-economical mode and an electrical-sport mode, wherein the hybrid electrical mode comprises a hybrid electrical-economical mode and a hybrid electrical-sport mode;

determine that the hybrid electrical vehicle is in the hybrid electrical-economical mode;

receive a mode switching instruction to switch to the electrical-economical mode; and

in response to determining that a second electric quantity of the power battery of the hybrid electrical vehicle in the hybrid electrical-economical mode is greater than or equal to a second electric quantity threshold, or a speed of the hybrid electrical vehicle in the hybrid electrical-economical mode is less than or equal to a first speed threshold, switch to the electrical-economical mode.

2. The control system of the hybrid electrical vehicle according to claim 1,

wherein a maximum output power of the power battery of the hybrid electrical vehicle in the electrical-economical mode is less than a first predetermined power,

wherein a maximum output power of the power battery of the hybrid electrical vehicle in the electrical-sport mode is less than a second predetermined power, wherein the second predetermined power is greater than the first predetermined power,

wherein each of a maximum output power of the power battery and a maximum output power of an engine of the engine power subsystem of the hybrid electrical vehicle in the hybrid electrical-economical mode is less than the first predetermined power, and a maximum output torque of the engine is less than a first torque threshold, and

wherein a maximum output power of the power battery of the hybrid electrical vehicle in the hybrid electrical-sport mode is less than the second predetermined power, and the control module is further configured to allow the engine to output the maximum output torque and the maximum output power.

3. The control system of the hybrid electrical vehicle according to claim 2, wherein the first predetermined power is 70 KW, the second predetermined power is 110 KW, and the first torque threshold is 185 N·

M.

4. The control system of the hybrid electrical vehicle according to claim 1, wherein the control module is further configured to:

determine whether the hybrid electrical vehicle is in the electrical-economical mode; and

in response to determining that a second maximum allowable discharge power of the power battery of the motor power subsystem is less than or equal to the first power threshold, or a third electric quantity of the power battery is less than or equal to the first electric quantity threshold, control the hybrid electrical vehicle to switch to the hybrid electrical-economical mode from the electrical-economical mode.

5. The control system of the hybrid electrical vehicle according to claim 4, wherein in response to determining that the hybrid electrical vehicle is in the electrical-economical mode or the electrical-sport mode and a mode switching instruction is received, the control module is configured to control the hybrid electrical vehicle to switch to a running mode corresponding to the mode switching instruction.

6. The control system of the hybrid electrical vehicle according to claim 1, wherein the control module is further configured to:

determine whether the hybrid electrical vehicle is in the electrical-sport mode; and

in response to determining that a second maximum allowable discharge power of the power battery of the motor power subsystem is less than or equal to the first power threshold, or a third current electric quantity of the power battery is less than or equal to the first electric quantity threshold, control the hybrid electrical vehicle to switch to the hybrid electrical-sport mode from the electrical-sport mode.

7. The control system of the hybrid electrical vehicle according to claim 1, wherein the control module is further configured to:

determine whether the hybrid electrical vehicle is in the electrical-economical mode; and

in response to determining that the hybrid electrical vehicle is in the electrical-economical mode, control the hybrid electrical vehicle to drive with a limited power.

8. A control method for a hybrid electrical vehicle, comprising:

controlling the hybrid electrical vehicle to operate in a corresponding work state by controlling an engine power subsystem and a motor power subsystem, wherein the work state comprises an electrical mode and a hybrid electrical mode;

detecting a first electric quantity of a power battery of the motor power subsystem, and a first maximum allowable discharge power of the power battery of the motor power subsystem;

determining whether the first maximum allowable discharge power of the power battery of the motor power subsystem is less than or equal to a first power threshold;

determining whether the first electric quantity of the power battery of the motor power subsystem is less than or equal to a first electric quantity threshold;

in response to determining that the first maximum allowable discharge power of the power battery of the motor power subsystem is less than or equal to the first power threshold, or the first electric quantity of the power battery is less than or equal to the first electric quantity threshold, switching to the hybrid electrical mode from the electrical mode, wherein the electrical mode comprises an electrical-economical mode and an electrical-sport mode, wherein the hybrid electrical mode comprises a hybrid electrical-economical mode and a hybrid electrical-sport mode;

determining that the hybrid electrical vehicle is in the hybrid electrical-economical mode;

receiving a mode switching instruction to switch to the electrical-economical mode; and

in response to determining that a second electric quantity of the power battery of the hybrid electrical vehicle in the hybrid electrical-economical mode is greater than or equal to a second electric quantity threshold, or a speed of the hybrid electrical vehicle in the hybrid electrical-economical mode is less than or equal to a first speed threshold, switching to the electrical-economical mode.

9. The control method for the hybrid electrical vehicle according to claim 8, further comprising:

determining whether the hybrid electrical vehicle is in the electrical-economical mode; and

in response to determining that a second maximum allowable discharge power of the power battery of the motor power subsystem is less than or equal to the first power threshold, or a third electric quantity of the power battery is less than or equal to the first electric quantity threshold, controlling the hybrid electrical vehicle to switch to the hybrid electrical-economical mode from the electrical-economical mode.

10. The control method for the hybrid electrical vehicle according to claim 8, further comprising:

determining whether the hybrid electrical vehicle is in the electrical-sport mode; and

in response to determining that a second maximum allowable discharge power of the power battery of the motor power subsystem is less than or equal to the first power threshold, or a third current electric quantity of the power battery is less than or equal to the first electric quantity threshold, controlling the hybrid electrical vehicle to switch to the hybrid electrical-sport mode from the electrical-sport mode.

11. The control method for the hybrid electrical vehicle according to claim 8, further comprising:

determining whether the hybrid electrical vehicle is in the electrical-economical mode; and

in response to determining that the hybrid electrical vehicle is in the electrical-economical mode, controlling the hybrid electrical vehicle to drive with a limited power.

12. The control method for the hybrid electrical vehicle according to claim 8, further comprising:

receiving a mode switching instruction;

determining whether the hybrid electrical vehicle is in the electrical-economical mode or the electrical-sport mode; and

in response to determining that the hybrid electrical vehicle is in the electrical-economical mode or the electrical-sport mode, controlling the hybrid electrical vehicle to switch to a running mode corresponding to the mode switching instruction.