Method for determining a characteristic curve of a hybrid separating clutch of a hybrid vehicle without a test stand

• US 10,399,560 B2
• Filed: 01/20/2016
• Issued: 09/03/2019
• Est. Priority Date: 02/04/2015
• Status: Active Grant

• Current Assignee: Schaeffler Technologies AG & Co.KG (INA-Holding Schaeffler GmbH & Co. KG)
• Original Assignee: Schaeffler Technologies AG & Co.KG (INA-Holding Schaeffler GmbH & Co. KG)
• Inventors: Schmitt, Werner
• Primary Examiner(s): Pang, Roger L
• Application Number:
  US15/539,895
• Publication Number:
  US 20180001886A1
• Time in Patent Office: 1,322 Days
• Field of Search: 701 68
• CPC Class Codes: B60K 6/387 Actuated clutches, i.e. clutches engaged or disengaged by electric, hydraulic or mechanical actuating means
• 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 10/196 acting within the driveline, e.g. retarders
• 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 2510/0275 Clutch torque
• CPC Class Codes: B60W 2510/0657 Engine torque
• CPC Class Codes: B60W 2710/027 Clutch torque
• CPC Class Codes: B60W 2710/065 Idle condition
• CPC Class Codes: B60W 2710/0666 Engine torque
• CPC Class Codes: B60Y 2200/92 Hybrid vehicles
• CPC Class Codes: B60Y 2300/42 Control of clutches
• CPC Class Codes: B60Y 2300/43 Control of engines
• CPC Class Codes: B60Y 2300/44 Control of engine at idle speed
• CPC Class Codes: B60Y 2300/60 Control of electric machines, e.g. problems related to electric motors or generators
• CPC Class Codes: F16D 2500/10412 Transmission line of a vehicle
• CPC Class Codes: F16D 2500/106 Engine
• CPC Class Codes: F16D 2500/1066 Hybrid
• CPC Class Codes: F16D 2500/1107 Vehicles
• CPC Class Codes: F16D 2500/30412 : Torque of the input shaft
• CPC Class Codes: F16D 2500/30421 : Torque of the output shaft
• CPC Class Codes: F16D 2500/3065 : Torque of the engine
• CPC Class Codes: F16D 2500/50236 : Adaptations of the clutch characteristics, e.g. curve clutch capacity torque - clutch actuator displacement
• CPC Class Codes: F16D 2500/50251 : During operation
• CPC Class Codes: F16D 2500/50281 : Transmitted torque
• CPC Class Codes: F16D 2500/70252 : Clutch torque
• CPC Class Codes: F16D 2500/70264 : Stroke
• CPC Class Codes: F16D 2500/70605 : Adaptive correction; Modifying control system parameters, e.g. gains, constants, look-up tables
• CPC Class Codes: F16D 48/06 : Control by electric or electronic means, e.g. of fluid pressure
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles
• CPC Class Codes: Y10S 903/914 : Actuated, e.g. engaged or disengaged by electrical, hydraulic or mechanical means
• CPC Class Codes: Y10S 903/93 : Conjoint control of different elements

Abstract

The invention relates to a method for determining a characteristic curve of a hybrid separating clutch of a hybrid vehicle without a test stand, wherein the hybrid separating clutch separates or connects an internal combustion engine and an electric motor and the hybrid separating clutch is slowly actuated on the basis of a position which the hybrid separating clutch assumes in an unactuated state, and a clutch characteristic curve is determined as a function of a clutch torque over a path of the hybrid separating clutch. In a method by which a characteristic curve of the hybrid separating clutch can be reliably defined without a test stand, a clutch torque which underlies the characteristic curve of the hybrid separating clutch is determined from the torque of the internal combustion engine in the case of a running internal combustion engine and a motion state of the electric motor which brakes the internal combustion engine while the hybrid separating clutch is moving.

Claims

1. A method for determination of a characteristic curve of a hybrid separating clutch of a hybrid vehicle without a test stand, with the hybrid separating clutch connecting or disconnecting an internal combustion engine and an electric motor, the method comprising:

actuating the hybrid separating clutch, starting from a position assumed thereby in an unactuated state, and determining a clutch characteristic curve as a function of a clutch torque over a path of the hybrid separating clutch, and with the internal combustion engine running and an operating state of the electric motor that brakes the internal combustion engine with the hybrid separating clutch moving, determining a clutch torque from a torque of the internal combustion engine underlying the clutch characteristic curve of the hybrid separating clutch while operating the electric motor in a rotational direction opposite from a rotational direction of the internal combustion engine.

2. The method according to claim 1, further comprising:

keeping the internal combustion engine at a predetermined idling speed by control measures, and increasing the torque of the internal combustion engine by a braking effect of the electric motor and determining the clutch torque by a difference of the torque under an influence of the braking electric motor and the torque without the influence of the electric motor.

3. The method according to claim 1, further comprising:

closing a second clutch of a transmission, connected to the electric motor and driving drive wheels to block the electric motor and subsequently moving the hybrid separating clutch from an opened state into a closed one, with the torque of the internal combustion engine being evaluated.

4. The method according to claim 3, further comprising:

before closing the second clutch, at least one of engaging a gear or blocking the hybrid vehicle with a brake.

5. The method according to claim 1, further comprising:

adjusting a saved default characteristic curve to the clutch characteristic curve deducted from an actually given torque of the internal combustion engine.

6. A method for determination of a characteristic curve of a hybrid separating clutch of a hybrid vehicle without a test stand, with the hybrid separating clutch connecting or disconnecting an internal combustion engine and an electric motor, the method comprising:

actuating the hybrid separating clutch, starting from a position assumed thereby in an unactuated state, and determining a clutch characteristic curve as a function of a clutch torque over a path of the hybrid separating clutch,

with the internal combustion engine running and an operating state of the electric motor that brakes the internal combustion engine with the hybrid separating clutch moving, determining a clutch torque from a torque of the internal combustion engine underlying the clutch characteristic curve of the hybrid separating clutch, and

with an opened second clutch, operating the electric motor in a direction of rotation opposite from a rotational direction of the internal combustion engine and moving the hybrid separating clutch from an opened state into a closed state, with the clutch characteristic curve of the hybrid separating clutch being determined as a function of the torque of the internal combustion engine.

7. The method according to claim 6, further comprising:

increasing an idling speed of the internal combustion engine.