# US 10,309,529 B2 · Method for operating a drivetrain of a motor vehicle, and drivetrain module of motor vehicle of said type

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- Number: US 10,309,529 B2
- Document ID: US10309529B2
- Status: Granted
- Kind: B2
- Application number: 15/492,576
- Filed: 2017-04-20
- Published: 2017-10-26
- Granted: 2019-06-04
- Earliest claimed: 2016-04-21
- Assignees: ZF Friedrichshafen AG
- Applicants: ZF Friedrichshafen AG
- Inventors: Felix Bühle; Falko Platzer; Thomas Lemp
- Web page: https://patentgrep.com/patent/US10309529B2

## CPC

- F16H 61/143: {using electric control means}
- B60K 6/48: Parallel type
- B60K 25/02: directly from an engine shaft
- B60W 10/026: {of lock-up clutches}
- B60W 10/06: including control of combustion engines
- B60W 10/30: including control of auxiliary equipment, e.g. air-conditioning compressors or oil pumps
- B60W 20/00: Control systems specially adapted for hybrid vehicles {(hybrid vehicle design, B60K6/00; electric vehicles B60L)}
- B60W 20/15: Control strategies specially adapted for achieving a particular effect
- B60W 30/18027: {Drive off, accelerating from standstill}
- F16H 61/0031: {using auxiliary pumps, e.g. pump driven by a different power source than the engine}
- B60K 2006/4825: {Electric machine connected or connectable to gearbox input shaft}
- B60K 2025/005: {driven by electric motors forming part of the propulsion unit}
- B60K 2025/022: {by a mechanical transmission}
- B60W 2710/021: Clutch engagement state
- B60W 2710/1083: pressure of control fluid
- B60W 2710/305: target power to auxiliaries
- B60Y 2200/92: Hybrid vehicles
- B60Y 2300/18025: Drive off, accelerating from standstill
- B60Y 2300/421: Control of lock-up type clutches, e.g. in a torque converter
- Y02T 10/62: Hybrid vehicles
- Y10S 903/946: Characterized by control of driveline clutch
- F16H: GEARING
- 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
- 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
- B60Y: INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A method for operating a drivetrain of a motor vehicle, includes, when the motor vehicle is at a standstill and upon demand for a drive torque of the motor vehicle, increasing power (25p) supplied to a separate electric pump drive (25) such that a pressure chamber whose pressurization effects a complete closure or lock-up of a launch element (3) is fast charged with hydraulic pressure from a pump (24). The method also includes performing a launch process of the motor vehicle with the drive source (1) and with a closed or locked-up launch element (3) and reducing the power (25p) supplied to the separate electric pump drive (25) after fast charging the pressure chamber. A related drive train module is also provided.

## Claims

### Claim 1

A method for operating a drivetrain of a motor vehicle, the drivetrain comprising at least one transmission (2) for providing different transmission ratios between a drive shaft (21) and an output shaft (22) of the transmission (2), a drive source (1) in the form of an electric motor, a launch element (3) which is hydraulically actuatable or lockable and which is situated in power flow between the drive source (1) and the output shaft (22), and a pump (24) which is operable independently of the drive source (1) by a separate electric pump drive (25) and is configured for hydraulic pressure supply to the transmission (2), the method comprising:
when the motor vehicle is at a standstill, and upon demand for a drive torque of the motor vehicle, increasing power (25p) supplied to the separate electric pump drive (25) such that a pressure chamber, whose pressurization effects a complete closure or lock-up of the launch element (3), is fast charged with hydraulic pressure from the pump (24);
performing a launch process of the motor vehicle with the drive source (1) and with a closed or locked-up launch element (3); and
during the launch process, reducing the power (25p) supplied to the separate electric pump drive (25) after fast charging the pressure chamber,
wherein an internal combustion engine (9) of the motor vehicle is off during the launch process.

### Claim 2 (depends on 1)

The method of claim 1, wherein reducing the power (25p) supplied to the separate electric pump drive (25) comprises reducing the power (25p) supplied to the pump drive (25) to a value which is dependent on a setpoint drive torque.

### Claim 3 (depends on 2)

The method of claim 2, wherein reducing the power (25p) supplied to the pump drive (25) comprises reducing the power (25p) supplied to the separate electric pump drive (25) in a continuous manner or a stepped manner.

### Claim 4 (depends on 1)

The method of claim 1, wherein reducing the power (25p) supplied to the separate electric pump drive (25) comprises reducing the power (25p) supplied to the separate electric pump drive (25) after reaching or overshooting a predetermined rotational speed value (1nt) of the drive source (1).

### Claim 5 (depends on 4)

The method of claim 4, wherein the predetermined rotational speed value (1nt) of the drive source (1) is temperature-dependent.

### Claim 6

A drivetrain module of a motor vehicle, comprising:
at least one drive source (1) in the form of an electric machine;
an interface to an internal combustion engine (9) of the motor vehicle;
a control unit;
a transmission (2) for providing different transmission ratios between a drive shaft (21) and an output shaft (22) of the transmission (2);
a launch element (3) which is hydraulically actuatable or lockable and which is situated in power flow between the drive source (1) and the output shaft (22); and
a pump (24) which is operable independently of the drive source (1) by a separate electric pump drive (25) and is configured for hydraulic pressure supply to the transmission (2),
wherein the control unit is programmed for
when the motor vehicle is at a standstill, and upon demand for a drive torque of the motor vehicle, increasing power (25p) supplied to the separate electric pump drive (25) such that a pressure chamber, whose pressurization effects a complete closure or lock-up of the launch element (3), is fast charged with hydraulic pressure from the pump (24),
performing a launch process of the motor vehicle with the drive source (1) and with a closed or locked-up launch element (3), and
during the launch process, reducing the power (25p) supplied to the separate electric pump drive (25) after fast charging the pressure chamber,
wherein the control unit is programmed such that the internal combustion engine (9) of the motor vehicle is off during the launch process.