METHOD FOR OPERATING A DRIVE SYSTEM, DRIVE SYSTEM, AND MOTOR VEHICLE

• US 20190308607A1
• Filed: 06/24/2019
• Published: 10/10/2019
• Est. Priority Date: 12/23/2016
• Status: Active Grant

• Current Assignee: Volkswagen AG
• Original Assignee: Volkswagen AG
• Inventors: EBUS, Feitse, HENTSCHEL, Lars
• Granted Patent: US 11,142,180 B2
• Time in Patent Office: Days
• CPC Class Codes: B60K 6/20 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
• CPC Class Codes: B60K 6/485 Motor-assist type
• CPC Class Codes: B60W 10/02 including control of driveline clutches
• 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 20/00 Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• 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 20/12 using control strategies taking into account route information estimation or calculation of non-directly measurable driving parameters B60W40/00
• CPC Class Codes: B60W 20/19 for achieving enhanced acceleration
• CPC Class Codes: B60W 2510/0657 Engine torque
• CPC Class Codes: B60W 2510/244 Charge state
• 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 2552/20 Road profile, i.e. the change in elevation or curvature of a plurality of continuous road segments
• CPC Class Codes: B60W 2556/50 of positioning data, e.g. GPS [Global Positioning System] data
• CPC Class Codes: B60W 2710/0666 Engine torque
• CPC Class Codes: B60W 2710/083 Torque
• CPC Class Codes: B60W 30/1882 characterised by the working point of the engine, e.g. by using engine output chart
• CPC Class Codes: B60Y 2200/92 : Hybrid vehicles
• CPC Class Codes: F02D 41/0087 : Selective cylinder activation, i.e. partial cylinder operation deceleration cut-off F02D41/123
• 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

Abstract

A method for operating a drive system for a motor vehicle having an internal combustion engine and having an electric motor. The internal combustion engine can be operated in a partial operating state as well as in a full operating state. A first threshold is defined for a target drive torque to be applied by the drive system for a switchover from the partial to the full operating state. After the first threshold is exceeded, a switchover is delayed for a defined period of time. A difference between the target drive torque and the actual drive torque of the internal combustion engine is compensated for by the electric motor. After the period of time has elapsed, a switchover from the partial operating state into the full operating state takes place if the first threshold value continues to be exceeded or a compensating operation of the electric motor is ended.

Claims

1. A method for operating a drive system for a motor vehicle having an internal combustion engine and having an electric motor in drive connection with the internal combustion engine, wherein the internal combustion engine is operatable in a partial operating state as well as in a full operating state, the method comprising:

defining a first threshold for a target drive torque to be applied by the drive system for a switchover from the partial operating state into the full operating state;

delaying a switchover, after the first threshold is exceeded, for a defined period of time;

compensating a difference between a target drive torque and an actual drive torque of the internal combustion engine for the electric motor; and

switching-over, after the period of time has elapsed, from the partial operating state to the full operating state if the first threshold value continues to be exceeded or ending a compensating operation of the electric motor if the torque has fallen below the first threshold again after the period of time has elapsed or as soon as this occurs during the period of time.

2. The method according to claim 1, wherein the defined period of time is a maximum of 10 seconds.

3. The method according to claim 1, wherein a switchover is delayed only if, or only as long as, the target drive torque that exceeds the first threshold is below a second threshold.

4. The method according to claim 1, wherein the first threshold and/or the second threshold and/or the defined period of time is variably chosen as a function of a current and/or future operating state of the drive system that corresponds to a current or future driving condition of the motor vehicle.

5. The method according to claim 1, wherein the first threshold and/or the second threshold and/or the defined period of time is variably chosen as a function of the charge state of an electrical energy storage device associated with the electric motor.

6. The method according to claim 1, wherein the actual drive torque produced by the internal combustion engine is increased during the delay of the switchover.

7. The method according to claim 1, wherein the electric motor is only utilized to support generation of a drive torque.

8. A drive system comprising:

an internal combustion engine operable in a partial operating state as well as in a full operating state; and

an electric motor in drive connection with the internal combustion engine,

a control device configured to perform the method according to claim 1.

9. A motor vehicle comprising a drive system according to claim 8.