Control system of hybrid electrical vehicle and control method for the same

• US 10,011,264 B2
• Filed: 09/03/2014
• Issued: 07/03/2018
• 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): McPherson, James M
• Application Number:
  US14/917,881
• Publication Number:
  US 20160221570A1
• Time in Patent Office: 1,399 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 2510/244 Charge state
• CPC Class Codes: B60W 2552/15 Road slope, i.e. the inclination of a road segment in the longitudinal direction
• CPC Class Codes: B60W 2710/0666 Engine torque
• CPC Class Codes: B60W 2710/0677 Engine power
• CPC Class Codes: B60W 2710/083 Torque
• 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 includes: a transmission device; an engine power subsystem and 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, and to control the hybrid electrical vehicle to operate in a first manner if a current slope detected by the hybrid electrical vehicle is less than or equal to a minimum slope and a current electric quantity of a power battery of the motor power subsystem is less than or equal to a first electric quantity threshold, or if the current slope is less than or equal to the minimum slope and a maximum allowable discharge power of the power battery is less than or equal to a first power threshold.

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 hybrid electrical-economical mode by controlling the engine power subsystem and the motor power subsystem and to control the hybrid electrical vehicle to operate in a first manner based on;

a current slope detected by the hybrid electrical vehicle being less than or equal to a minimum slope,

a current electric quantity of a power battery of the motor power subsystem being greater than or equal to a first electric quantity threshold, and

a maximum allowable discharge power of the power battery being greater than or equal to a first power threshold,

wherein based on the hybrid electrical vehicle operating in the first manner and a speed of the hybrid electrical vehicle being greater than or equal to a second speed threshold, the control module is configured to;

control an engine of the engine power subsystem to output a first torque with a predetermined torque upper limit curve, and control an electric motor of the motor power subsystem to complement the first torque based on a torque requirement of the hybrid electrical vehicle exceeding the predetermined torque upper limit curve of the engine;

control the engine to output a second torque with a predetermined torque lower limit curve, and control the electric motor to generate power based on the torque requirement of the hybrid electrical vehicle being below the predetermined torque lower limit curve of the engine; and

control the engine to output a third torque satisfying the torque requirement of the hybrid electrical vehicle and control the electric motor to generate power based on the torque requirement of the hybrid electrical vehicle exceeding the predetermined torque lower limit curve of the engine and being below the predetermined torque upper limit curve of the engine.

2. The control system of the hybrid electrical vehicle according to claim 1, wherein the control module is configured control the hybrid electrical vehicle to operate in a second manner based on:

the slope detected by the hybrid electrical vehicle being less than or equal to the minimum slope and the current electric quantity of the power battery being less than or equal to a second electric quantity threshold, or

the current slope detected by the hybrid electrical vehicle being less than or equal to the minimum slope and the maximum allowable discharge power of the power battery being less than or equal to a second power threshold,

wherein the first electric quantity threshold is greater than the second electric quantity threshold and the first power threshold is greater than the second power threshold.

3. The control system of the hybrid electrical vehicle according to claim 1, wherein the control module is configured to control an engine of the engine power subsystem to stop and to control an electric motor of the motor power subsystem to operate based on the hybrid electrical vehicle operating in the first manner and a speed of the hybrid electrical vehicle being less than or equal to a first speed threshold.

4. The control system of the hybrid electrical vehicle according to claim 2, wherein based on the hybrid electrical vehicle operating in the second manner and being in a non-P gear, the control module is configured to:

control an engine to output a first torque with a predetermined torque upper limit curve and control an electric motor of the motor power subsystem to complement the first torque based on a torque requirement of the hybrid electrical vehicle exceeding the predetermined torque upper limit curve of the engine;

control the engine to output a second torque with a predetermined torque lower limit curve and control the electric motor to generate power based on the torque requirement of the hybrid electrical vehicle being below the predetermined torque lower limit curve of the engine; and

control the engine to output a third torque satisfying the torque requirement of the hybrid electrical vehicle and control the electric motor to generate power based on the torque requirement of the hybrid electrical vehicle exceeding the predetermined torque lower limit curve of the engine and being below the predetermined torque upper limit curve of the engine.

5. The control system of the hybrid electrical vehicle according to claim 2, wherein based on the hybrid electrical vehicle operating in the second manner and being in a P gear, the control module is configured to control the hybrid electrical vehicle to enter an idle stop-start mode.

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

controlling the hybrid electrical vehicle to operate in a hybrid electrical-economical mode by controlling an engine power subsystem and a motor power subsystem;

detecting a current electric quantity of a power battery of the motor power subsystem, a maximum allowable discharge power of the power battery, and a current slope of the hybrid electrical vehicle; and

controlling the hybrid electrical vehicle to operate in a first manner based on determining that the current slope detected by the hybrid electrical vehicle is less than or equal to a minimum slope, the current electric quantity of the power battery is greater than or equal to a first electric quantity threshold, and the maximum allowable discharge power of the power battery is greater than or equal to a first power threshold,

wherein based on determining that the hybrid electrical vehicle operates in the first manner and a speed of the hybrid electrical vehicle is greater than or equal to a second speed threshold, the control method further comprising;

controlling an engine to output a first torque with a predetermined torque upper limit curve and controlling an electric motor to complement the torque based on determining that a torque requirement of the hybrid electrical vehicle exceeds the predetermined torque upper limit curve of the engine;

controlling the engine to output a second torque with a predetermined torque lower limit curve and controlling the electric motor to generate power based on determining that the torque requirement of the hybrid electrical vehicle is below the predetermined torque lower limit curve of the engine; and

controlling the engine to output a third torque satisfying the torque requirement of the hybrid electrical vehicle and controlling the electric motor to generate power based on determining that the torque requirement of the hybrid electrical vehicle exceeds the predetermined torque lower limit curve of the engine and is below the predetermined torque upper limit curve of the engine.

7. The control method for the hybrid electrical vehicle according to claim 6, further comprising:

controlling the hybrid electrical vehicle to operate in a second manner based on determining that;

the slope detected by the hybrid electrical vehicle is less than or equal to the minimum slope and the current electric quantity of the power battery is less than or equal to a second electric quantity threshold, or

the current slope detected by the hybrid electrical vehicle is less than or equal to the minimum slope and the maximum allowable discharge power of the power battery is less than or equal to a second power threshold,

wherein the second electric quantity threshold is greater than the first electric quantity threshold, and the first power threshold is greater than the second power threshold.

8. The control method for the hybrid electrical vehicle according to claim 6, further comprising:

controlling an engine of the engine power subsystem to stop and controlling an electric motor of the motor power subsystem to operate based on determining that the hybrid electrical vehicle operates in the first manner and a speed of the hybrid electrical vehicle is less than or equal to a first speed threshold.

9. The control method for the hybrid electrical vehicle according to claim 7, wherein based on determining that the hybrid electrical vehicle operates in the second manner and is in a non-P gear, the control method further comprising:

controlling an engine to output a first torque with a predetermined torque upper limit curve and controlling the electric motor to complement the first torque based on determining that a torque requirement of the hybrid electrical vehicle exceeds the predetermined torque upper limit curve of the engine;

controlling the engine to output a second torque with a predetermined torque lower limit curve and controlling the electric motor to generate power based on determining that the torque requirement of the hybrid electrical vehicle is below the predetermined torque lower limit curve of the engine;

or

controlling the engine to output a third torque satisfying the torque requirement of the hybrid electrical vehicle and controlling the electric motor to generate power based on determining that the torque requirement of the hybrid electrical vehicle exceeds the predetermined torque lower limit curve of the engine and is below the predetermined torque upper limit curve of the engine.

10. The control method for the hybrid electrical vehicle according to claim 7, further comprising controlling the hybrid electrical vehicle to enter an idle stop-start mode based on determining that the hybrid electrical vehicle operates in the second manner and is in a P gear.