Drivetrain for a motor vehicle

• US 20030102173A1
• Filed: 10/19/2001
• Published: 06/05/2003
• Est. Priority Date: 02/22/2000
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Ahner, Peter, Tschentscher, Harald, Ackermann, Manfred, Koelle, Gerhard
• Granted Patent: US 6,830,118 B2
• Time in Patent Office: Days
• US Class Current: 180/65.2
• CPC Class Codes: B60K 2006/268 Electric drive motor starts the engine, i.e. used as starter motor
• CPC Class Codes: B60K 6/26 characterised by the motors or the generators
• CPC Class Codes: B60K 6/485 Motor-assist type
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60W 10/02 including control of driveline clutches
• 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 20/40 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 30/18027 Drive off, accelerating from standstill
• CPC Class Codes: B60W 30/18118 Hill holding
• CPC Class Codes: F02N 11/0814 comprising means for controlling automatic idle-start-stop
• CPC Class Codes: Y02T 10/40 Engine management systems
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y10S 903/906 Motor or generator
• CPC Class Codes: Y10S 903/946 Characterized by control of driveline clutch

Abstract

The invention relates to a drive train for a motor vehicle, having an internal combustion engine 1, having an electric machine 2, which upon starting of the engine 1 generates a torque, and having a clutch 3, which is disposed between the engine 1 and a gear train 4 by way of which a torque generated by the engine 1 can be transmitted to at least one vehicle drive wheel.

According to the invention means 5, 6 are provided, which upon starting of the engine can actuate the clutch 3 in such a way that a first part of the torque generated upon starting of the engine by the electric machine 2 is transmitted to the at least one vehicle drive wheel, and a second part of the torque generated by the electric machine and sufficient for starting the engine is transmitted to the engine 1.

Claims

1. A drive train for a motor vehicle, having an internal combustion engine (1), having an electric machine (2), which upon starting of the engine (1) generates a torque, and having a clutch (3), which is disposed between the engine (1) and a gear train (4) by way of which a torque generated by the engine (1) can be transmitted to at least one vehicle drive wheel, characterized in that means (5, 6) are provided, which upon starting of the engine can actuate the clutch (3) in such a way that a first part of the torque generated upon starting of the engine by the electric machine (2) is transmitted to the at least one vehicle drive wheel, and a second part of the torque generated by the electric machine (2) and sufficient for starting the engine (1) is transmitted to the engine (1).

2. The drive train of claim 1, characterized in that the means include a control device (5).

3. The drive train of one of the foregoing claims, characterized in that for the control device (5), temperature- and/or rpm-dependent performance graphs for the drive torque of the engine (1) and/or for the starting torque and/or for the clutch engagement moment, which is predominantly dependent on the clutch engagement travel, are used.

4. The drive train of one of the foregoing claims, characterized in that the performance graphs are varied adaptively.

5. The drive train of one of the foregoing claims, characterized in that the means include a regulating device (5).

6. The drive train of one of the foregoing claims, characterized in that the regulating device regulates the torque, transmitted upon starting of the engine (1) by the electric machine (2) to the at least one vehicle drive wheel, in such a way that rotational irregularities of the engine (1) upon starting of the engine (1) are decoupled from the at least one vehicle drive wheel.

7. The drive train of one of the foregoing claims, characterized in that the decoupling of the rotational irregularities is effected at least until such time as the engine (1) has reached an rpm at which it is capable of outputting power.

8. The drive train of one of the foregoing claims, characterized in that the regulating device regulates the torque, transmitted upon starting of the engine (1) by the electric machine (2) to the at least one vehicle drive wheel, in such a way that the motor vehicle is kept at a stop until the engine (1) has reached an rpm at which it can output power.

9. The drive train of one of the foregoing claims, characterized in that the sensors are provided, which detect an exceptional state in which the motor vehicle, because of external forces, would undesirably put itself into motion, because the torque transmitted upon starting of the electric machine to the at least one vehicle drive wheel is too low to prevent the unwanted motion of the motor vehicle.

10. The drive train of one of the foregoing claims, characterized in that the exceptional state detected by the sensors is indicated to the driver.

11. The drive train of one of the foregoing claims, characterized in that a vehicle brake is provided, which is actuated automatically upon the occurrence of the exceptional state.

12. The drive train of one of the foregoing claims, characterized in that the vehicle brake is automatically released when the engine (1) has reached an rpm at which it can output power.

13. The drive train of one of the foregoing claims, characterized in that the regulating device regulates the torque, transmitted upon starting of the engine (1) by the electric machine (2) to the at least one vehicle drive wheel, in such a way that the motor vehicle puts itself in motion, before the engine (1) has reached an rpm at which it can output power.

14. The drive train of one of the foregoing claims, characterized in that the means include an automatic clutch (6), which actuates the clutch (3).

15. The drive train of one of the foregoing claims, characterized in that the regulating device (5) triggers the automatic clutch (6).

16. The drive train of one of the foregoing claims, characterized in that an automatic start-stop control is provided, which can stop the engine when the motor vehicle is stopped and re-start it for driving on again.

17. The drive train of one of the foregoing claims, characterized in that only in stop and go operation of the motor vehicle, but not the first time an engine is started on a given trip, the first part of the torque generated upon starting by the electric machine (2) is transmitted to the at least one drive wheel.

18. The drive train of one of the foregoing claims, characterized in that the electric machine (2) is a starter.

19. The drive train of one of the foregoing claims, characterized in that the electric machine (2) is a starter-generator.