Hybrid electrical vehicle and method for controlling the same

• US 10,077,039 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): Sweeney, Brian P
• Application Number:
  US14/917,887
• Publication Number:
  US 20170036662A1
• Time in Patent Office: 1,476 Days
• Field of Search: 701 22
• 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 20/12 using control strategies taking into account route information estimation or calculation of non-directly measurable driving parameters B60W40/00
• 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 20/40 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 2510/1005 Transmission ratio engaged
• CPC Class Codes: B60W 2510/244 Charge state
• CPC Class Codes: B60W 2520/10 Longitudinal speed
• 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 2710/086 Power
• 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: B60W 50/082 Selecting or switching between different modes of propelling
• CPC Class Codes: B60Y 2200/92 Hybrid vehicles
• CPC Class Codes: B60Y 2300/188 Controlling power parameters of the driveline, e.g. determining the required power
• 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 work 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 work in a first manner.

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 connected with the engine power subsystem and the motor power subsystem, wherein the control module is 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 detected by the hybrid electrical vehicle 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.

2. The control system of the hybrid electrical vehicle according to claim 1, wherein if the hybrid electrical vehicle is operating in the first manner and is in a non-P gear,

the control module is configured to control an engine of the engine power subsystem to output a torque with a predetermined torque upper limit curve and to control an electric motor of the electric motor of the motor power subsystem to complement the torque if a torque requirement of the hybrid electrical vehicle exceeds the predetermined torque upper limit curve of the engine;

the control module is configured to control the engine to output a torque with a predetermined torque lower limit curve and to control the electric motor to generate power if the torque requirement of the hybrid electrical vehicle is below the predetermined torque lower limit curve of the engine; and

the control module is configured to control the engine to output a torque satisfying the torque requirement of the hybrid electrical vehicle and to control the electric motor to generate power if 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.

3. The control system of the hybrid electrical vehicle according to claim 1, wherein if the hybrid electrical vehicle is operating in the first manner and is in a P gear, the control module is configured to control the hybrid electrical vehicle to enter an idle stop-start mode.

4. The control system of the hybrid electrical vehicle according to claim 3, wherein if the hybrid electrical vehicle is operating in the idle stop-start mode, the control module is configured to determine whether idle stop-start conditions are satisfied, and if the idle stop-start conditions are satisfied, the control module is configured to control an engine of the engine power subsystem to be stalled.

5. The control system of the hybrid electrical vehicle according to claim 4, wherein the idle stop-start conditions comprise:

a current speed of the hybrid electrical vehicle is less than a first speed threshold;

the hybrid electrical vehicle is in the P gear; and

the current electric quantity of the power battery of the motor power subsystem is greater than or equal to the first electric quantity threshold.

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 when the hybrid electrical vehicle is running;

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 of the hybrid electrical vehicle is less than or equal to a minimum slope and the current electric quantity of the power battery is less than or equal to a first electric quantity threshold or the current slope of the hybrid electrical vehicle is less than or equal to the minimum slope and the maximum allowable discharge power of the power battery of the motor power subsystem is less than or equal to a first power threshold.

7. The control method for the hybrid electrical vehicle according to claim 6, wherein if the hybrid electrical vehicle is operating in the first manner and is in a non-P gear the control method further comprises:

controlling an engine of the engine power subsystem to output a torque with a predetermined torque upper limit curve and controlling an electric motor of the motor power subsystem to complement the torque if a torque requirement of the hybrid electrical vehicle exceeds the predetermined torque upper limit curve of the engine;

controlling the engine to output a torque with a predetermined torque lower limit curve and controlling the electric motor to generate power if 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 torque satisfying the torque requirement of the hybrid electrical vehicle and controlling the electric motor to generate power if 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.

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

controlling the hybrid electrical vehicle to enter an idle stop-start mode if the hybrid electrical vehicle is operating in the first manner and is in a P gear.

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

determining whether idle stop-start conditions are satisfied if the hybrid electrical vehicle is operating in the idle stop-start mode; and

controlling an engine of the engine power subsystem to be stalled if the idle stop-start conditions are satisfied.

10. The control method for the hybrid electrical vehicle according to claim 9, wherein the idle stop-start conditions comprise:

a current speed of the hybrid electrical vehicle is less than a first speed threshold;

the hybrid electrical vehicle is in the P gear; and

the current electric quantity of the power battery of the motor power subsystem is greater than or equal to the first electric quantity threshold.