Method for regulating rotational speed

• US 9,908,521 B2
• Filed: 10/16/2009
• Issued: 03/06/2018
• Est. Priority Date: 11/21/2008
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Seel, Andreas
• Primary Examiner(s): Badii, Behrang
• Application Number:
  US13/130,500
• Publication Number:
  US 20110301798A1
• Time in Patent Office: 3,063 Days
• Field of Search: 701 22
• CPC Class Codes: B60K 6/00 Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units arrangement or mounting in vehicles of electrical gearing, in which an electrical machine serves only as reduction gearing and not as the prime mover and in which no electrical storing means are used B60K17/12; control and regulation of purely electrical prime movers B60L; prime-movers comprising electrical and internal combustion motors in a common engine block or housing per se F02B65/00; electric motors or motor-generators used for starting the combustion engine F02N11/04; electric motors for synchronising gearing F16H3/12 Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
• CPC Class Codes: B60K 6/365 with the gears having orbital motion
• CPC Class Codes: B60K 6/383 One-way clutches or freewheel devices
• CPC Class Codes: B60K 6/442 Series-parallel switching type
• CPC Class Codes: B60K 6/48 Parallel type
• CPC Class Codes: B60K 6/485 Motor-assist type
• CPC Class Codes: B60L 2240/421 Speed
• CPC Class Codes: B60L 2240/441 Speed
• CPC Class Codes: B60L 50/15 with additional electric power supply with capacitors charged by engine-driven generators B60L50/40; with batteries charged by engine-driven generators B60L50/61
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• 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 20/11 using model predictive control [MPC] strategies, i.e. control methods based on models predicting performance utilising navigation and traffic information in the control strategy B60W20/12
• CPC Class Codes: B60W 2510/0638 Engine speed
• CPC Class Codes: B60W 2510/0695 Inertia
• CPC Class Codes: B60W 2510/081 Speed
• CPC Class Codes: B60W 2710/0644 Engine speed
• CPC Class Codes: B60W 2710/081 Speed
• CPC Class Codes: B60W 30/20 Reducing vibrations in the driveline
• CPC Class Codes: F02D 41/04 Introducing corrections for particular operating conditions F02D41/14 takes precedence
• CPC Class Codes: F02D 41/047 Taking into account fuel evaporation or wall wetting; special correction after fuel cut-off F02D41/126
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles
• CPC Class Codes: Y02T 10/64 : Electric machine technologies in electromobility

Abstract

A method is provided for regulating the rotational speed in a hybrid drive of a vehicle having a first drive source, in particular an internal combustion engine, and a second drive source, in particular an electric motor. A rotational speed variable which is a function of a rotational speed of the first drive source and of a rotational speed of the second drive source is determined. The rotational speed of the first drive source or of the second drive source is regulated based on the rotational speed variable for oscillation reduction. The rotational speed variable used is preferably a mean value of the two rotational speeds. The two rotational speeds may be weighted on the basis of inertia in order to form the mean value as well.

Claims

1. A method for regulating rotational speed in a hybrid drive of a vehicle having a first drive source and a second drive source, the method comprising:

computing, by a control unit, a rotational speed variable as a function of (a) a rotational speed of the first drive source and (b) a rotational speed of the second drive source, wherein the rotational speed variable is an arithmetic or weighted mean of the rotational speed of the first drive source and the rotational speed of the second drive source; and

regulating the rotational speed of the first drive source or the rotational speed of the second drive source based on the rotational speed variable in order to reduce oscillation.

2. The method of claim 1, wherein at least one of the first or second drive sources of the vehicle is an internal combustion engine.

3. The method of claim 1, wherein at least one of the first or second drive sources of the vehicle is an electric motor.

4. The method of claim 1, wherein the regulation of the rotational speed is carried out based on the rotational speed variable during engagement of the first drive source to a drive train of the vehicle driven by the second drive source.

5. The method of claim 1, wherein the regulation of the rotational speed is carried out based on the rotational speed variable during engagement, with the aid of a separating clutch, of the first drive source to a drive train of the vehicle driven by the second drive source.

6. The method of claim 1, wherein the regulation of the rotational speed is carried out based on the rotational speed variable during engagement of the first drive source to a drive train of the vehicle driven by the second drive source.

7. The method of claim 1, wherein, in the determination of the rotational speed variable, (a) the rotational speed of the first drive source is linked with a rotational inertia of the first drive source, or (b) the rotational speed of the second drive source is linked with a rotational inertia of the second drive source.

8. The method of claim 1, wherein, in the determination of the rotational speed variable, (a) the rotational speed of the first drive source is weighted with a rotational inertia of the first drive source, or (b) the rotational speed of the second drive source is weighted with a rotational inertia of the second drive source.

9. The method of claim 1, further comprising:

activating the regulation of the rotational speed when the rotational speed of the first drive source is above or below the rotational speed of the second drive source.

10. The method of claim 1, further comprising:

after completion of the regulation of the rotational speed based on the rotational speed variable, regulating the rotational speed based on (a) the rotational speed of the first drive source or (b) the rotational speed of the second drive source.

11. The method of claim 1, wherein the regulation of the rotational speed based on the rotational speed variable is performed up to a predetermined number of occurrences of the rotational speed of the first drive source exceeding and/or falling below the rotational speed of the second drive source.

12. The method of claim 1, further comprising:

determining, for the regulation of the rotational speed, a difference between the rotational speed variable and a setpoint rotational speed.

13. The method of claim 1, further comprising:

detecting, for activating the regulation based on the rotational speed variable, (a) an oscillation of the rotational speed of the first drive source or (b) an oscillation of the rotational speed of the second drive source.

14. The method of claim 1, further comprising:

detecting, for activating the regulation based on the rotational speed variable, a first occurrence of the rotational speed of the first drive source exceeding or falling below the rotational speed of the second drive source.

18. The method of claim 1, further comprising:

providing the rotational speed variable as an input to a switching unit of a regulation device.

20. The method of claim 1, further comprising:

detecting an intersection of a value of the rotational speed of the first drive source with a value of the rotational speed of the second drive source;

wherein the regulating of the rotational speed of the first drive source or the rotational speed of the second drive source based on the rotational speed variable is performed in response to the detecting.

21. The method of claim 20, further comprising:

detecting a predetermined number of intersections of the value of the rotational speed of the first drive source with the value of the rotational speed of the second drive source; and

stopping the regulating of the rotational speed of the first drive source or the rotational speed of the second drive source based on the rotational speed variable in response to the detecting.

22. The method of claim 1, further comprising:

detecting a predetermined number of intersections of a value of the rotational speed of the first drive source with a value of the rotational speed of the second drive source;

wherein the regulating of the rotational speed of the first drive source or the rotational speed of the second drive source based on the rotational speed variable is performed in response to the detecting.

23. The method of claim 1, wherein the computing computes the rotational speed variable as a function of a rotational inertia of the first drive source.

24. The method of claim 23, wherein the computing computes the rotational speed variable as a function of a rotational inertia of the second drive source.

25. The method of claim 1, wherein the regulating regulates the rotational speed of the first drive source or the rotational speed of the second drive source to a rotational speed equal to the computed rotational speed variable.

15. A vehicle control device, comprising:

a processor; and

a non-transitory computer-readable storage medium having a computer program, which is executable by the processor for regulating rotational speed in a hybrid drive of a vehicle having a first drive source and a second drive source, by performing the following;

computing a rotational speed variable as a function of (a) a rotational speed of the first drive source and (b) a rotational speed of the second drive source, wherein the rotational speed variable is an arithmetic or weighted mean of the rotational speed of the first drive source and the rotational speed of the second drive source; and

regulating the rotational speed of the first drive source or the rotational speed of the second drive source based on the rotational speed variable in order to reduce oscillation.

16. The vehicle control device of claim 15, wherein at least one of the first or second drive sources of the vehicle is an internal combustion engine.

17. The vehicle control device of claim 15, wherein at least one of the first or second drive sources of the vehicle is an electric motor.

19. The vehicle control device of claim 15, wherein the rotational speed variable is provided as an input to a switching unit of a regulation device.