# US 2014/0207349 A1 · Method for the Approximate Determination of the Torque Which is Actually Transmitted by a Clutch of a Drive Train of a Vehicle

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- Number: US 2014/0207349 A1
- Document ID: US20140207349A1
- Status: Published application
- Kind: A1
- Application number: 14/221,956
- Filed: 2014-03-21
- Published: 2014-07-24
- Earliest claimed: 2011-10-20
- Assignees: Bayerische Motoren Werke Aktiengesellschaft
- Applicants: Bayerische Motoren Werke Aktiengesellschaft
- Inventors: Thomas CHRIST; Felix LINS
- Web page: https://patentgrep.com/patent/US20140207349A1

## CPC

- 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)}
- B60W 10/02: including control of driveline clutches
- 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)}
- F16D 48/06: Control by electric or electronic means, e.g. of fluid pressure
- F16D 48/066: {Control of fluid pressure, e.g. using an accumulator (F16D48/062, F16D48/068 take precedence)}
- B60W 2510/0275: Clutch torque
- F16D 2500/1066: Hybrid
- F16D 2500/30425: Estimation of the transmitted clutch torque, e.g. applying dynamic torque balance equation
- F16D 2500/708: Mathematical model
- F16H 2061/0093: {using models to estimate the state of the controlled object}
- F16H 2342/044: Torque transmitting capability
- B60W: CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16H: GEARING

## Abstract

A method for approximately determining the torque actually transmitted by a clutch of a drive train of a vehicle, includes the steps of: setting a closed state of the clutch and transmitting a torque by way of the drive train, providing a state space model showing the drive train, particularly a Kalman filter, determining a torque which can theoretically be transmitted or is transmitted by the clutch in the closed state, and approximately determining the torque actually transmitted by the clutch, by adding the theoretically transmittable or transmitted torque and a disturbance torque determined by calculation, wherein the disturbance torque is determined on the basis of the state space model and actual rotational speeds of individual drive train components and/or of actual torques transmitted by individual drive train components.

## Claims

### Claim 1

A method for approximately determining a torque actually transmitted by a clutch of a drive train of a vehicle, the method comprising the acts of:
setting the clutch in a closed state and transmitting a torque by way of the drive train of the vehicle;
providing a state space model which models the drive train of the vehicle;
determining a torque theoretically transmittable or which is transmitted by the clutch in the closed state;
calculating a disturbance torque, wherein the disturbance torque is determined based on: (i) the state space model and a Kalman filter, and (ii) actual rotational speeds of individual components of the drive train and/or actual torques transmitted by the individual components;
adding the theoretically transmittable or transmitted torque and the calculated disturbance torque to approximately determine the torque actually transmitted by the clutch of the drive train of the vehicle.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the torque theoretically transmittable or transmitted by the clutch in the closed state is determined by calculation based on a predefined physical model of the clutch and of the set closed state of the clutch.

### Claim 3 (depends on 2)

The method according to claim 2, wherein the setting of the closed state of the clutch is carried out by a closing hydraulic system.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the setting of the closed state of the clutch is carried out by a closing hydraulic system.

### Claim 5

A method for controlling torque transmitted by a drive train of a vehicle to driven wheels of the vehicle corresponding to a desired torque, the method comprising the acts of:
setting the clutch in a closed state and transmitting a torque by way of the drive train of the vehicle;
providing a state space model which models the drive train of the vehicle;
determining a torque theoretically transmittable or which is transmitted by the clutch in the closed state;
calculating a disturbance torque, wherein the disturbance torque is determined based on: (i) the state space model and a Kalman filter, and (ii) actual rotational speeds of individual components of the drive train and/or actual torques transmitted by the individual components;
adding the theoretically transmittable or transmitted torque and the calculated disturbance torque to approximately determine the torque actually transmitted by the clutch of the drive train of the vehicle; and
compensating the disturbance torque observed at the clutch by impressing a compensation torque via an electric machine on a rotating component of the drive train and/or by changing the closed state of the clutch.

### Claim 6 (depends on 4)

The method according to claim 4, wherein an internal-combustion engine drives the drive train, and further wherein the disturbance torque observed at the clutch and to be compensated is caused by an additional start of the internal-combustion engine.