# US 11,027,739 B2 · Method and control device for operating a power takeoff

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- Number: US 11,027,739 B2
- Document ID: US11027739B2
- Status: Granted
- Kind: B2
- Application number: 16/650,040
- Filed: 2018-08-29
- Published: 2020-07-23
- Granted: 2021-06-08
- Earliest claimed: 2017-09-28
- Assignees: ZF Friedrichshafen AG
- Applicants: ZF Friedrichshafen AG
- Inventors: Anton Waibel; Dieter Strak; Wolfgang Schmid
- Web page: https://patentgrep.com/patent/US11027739B2

## CPC

- B60W 30/184: Preventing damage resulting from overload or excessive wear of the driveline
- B60W 30/1888: {Control of power take off [PTO]}
- B60K 17/28: characterised by arrangement, location, or type of power take-off
- B60K 25/06: from the transmission power take-off
- B60W 10/11: Stepped gearings
- B60W 10/30: including control of auxiliary equipment, e.g. air-conditioning compressors or oil pumps
- B60W 2710/1005: Transmission ratio engaged
- 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
- B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES

## Abstract

A method for operating an auxiliary power take-off (5) in a drive-train of a motor vehicle with at least a drive aggregate (1) and with a transmission (2) connected between the drive aggregate (1) and an axle drive (4). To operate the power take-off (5,) a transmission gear is engaged in the transmission (2). During an uninterrupted operation of the power take-off (5), after lapse of a defined time period, an automatic shift to a protective gear is carried out in the transmission (2).

## Claims

### Claim 1

A method for operating an auxiliary power take-off in a drive-train of a motor vehicle having at least a drive aggregate and an axle drive , and a transmission connected between the drive aggregate and the axle drive, the method comprising:
engaging an initial transmission gear in the transmission to operate the power take-off; and
during uninterrupted operation of the power take-off in the initial transmission gear in the transmission, after a lapse of a defined time period, automatically shifting to a protective gear in the transmission.

### Claim 2 (depends on 1)

The method according to claim 1, further comprising only shifting the transmission to the protective gear for a specifiable time, and, after lapse of the specifiable time, automatically re-engaging the initial transmission gear.

### Claim 3 (depends on 1)

The method according to claim 1, further comprising interrupting operation of the power take-off with the protective gear engaged in the transmission by a torque demand of an operator of the vehicle.

### Claim 4 (depends on 1)

The method according to claim 1, further comprising carrying out the automatic shift to the protective gear, before the lapse of the defined time period, if an auxiliary unit driven by the power take-off is operated under reduced power.

### Claim 5 (depends on 4)

The method according to claim 4, further comprising re-engaging the initial transmission gear in the transmission, if a higher torque from the drive aggregate, for operating the power take-off, is requested by an operator of the vehicle.

### Claim 6 (depends on 1)

The method according to claim 1, further comprising informing an operator of the vehicle about the automatic shift into the protective gear.

### Claim 7 (depends on 1)

The method according to claim 1, further comprising operating the drive aggregate in such manner that a rotational speed of a power take-off shaft, when the protective gear is engaged in the transmission, corresponds to a rotational speed of the power take-off shaft before the automatic shift to the protective gear.

### Claim 8

A control device for operating an power take-off in a drive-train of a motor vehicle with at least a drive aggregate and a transmission connected between the drive aggregate and an axle drive, the control device comprises at least a receiving interface designed to receive input signals from drive-train components; an evaluation unit for evaluating the input signals received; and a sender interface for emitting control signals to drive-train components;
for the operation of the power take-off, the control device controlling an actuator system by which an initial transmission gear is engaged in the transmission, and, after lapse of a defined time period of uninterrupted power take-off operation, the control device activating the actuator system by which a protective gear is engaged in the transmission.

### Claim 9 (depends on 8)

The control device according to claim 8, wherein the control device carries out, by control means, engaging an initial transmission gear in the transmission to operate the power take-off; and during uninterrupted operation of the power take-off in the initial transmission gear in the transmission, automatically shifting to the protective gear in the transmission after the lapse of the defined time period.

### Claim 10 (depends on 8)

A computer program product with program code means which is stored on a computer-readable data carrier and which is run on a control device according to claim 8 such that when the computer program product is run on the control device for operating of the power take-off, the control device controls the actuator system by which the initial transmission gear is engaged in the transmission, and after lapse of the defined time period of uninterrupted power take-off operation, the control device activates the actuator system by which the protective gear is engaged in the transmission.

### Claim 11

A computer program product with program code means which is stored on a computer-readable data carrier and which is run on a control device for operating an power take-off in a drive-train of a motor vehicle with at least a drive aggregate and a transmission connected between the drive aggregate and an axle drive, the control device having at least a receiving interface designed to receive input signals from drive-train components; an evaluation unit for evaluating the input signals received; and a sender interface for emitting control signals to drive-train components;
such that when the computer program product is run on the control device for operating of the power take-off, the control device controls an actuator system by which an initial transmission gear is engaged in the transmission, and after lapse of a defined time period of uninterrupted power take-off operation, the control device activates the actuator system by which a protective gear is engaged in the transmission.