# US 10,479,350 B2 · Method for controlling a hybrid vehicle driveline

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- Number: US 10,479,350 B2
- Document ID: US10479350B2
- Status: Granted
- Kind: B2
- Application number: 15/124,854
- Filed: 2015-03-17
- Published: 2017-01-19
- Granted: 2019-11-19
- Earliest claimed: 2014-03-20
- Assignees: Scania CV AB
- Applicants: Scania CV AB
- Inventors: Mathias Björkman; Niklas Pettersson; Johan Lindström; Mikael Bergquist
- Web page: https://patentgrep.com/patent/US10479350B2

## CPC

- B60W 20/30: Control strategies involving selection of transmission gear ratio {(control of change speed gearings, together with other vehicle sub-units B60W10/10; HEV transmission gearing B60K6/36; gearings and control thereof F16H)}
- B60K 1/02: comprising more than one electric motor
- B60K 6/365: with the gears having orbital motion
- B60K 6/387: Actuated clutches, i.e. clutches engaged or disengaged by electric, hydraulic or mechanical actuating means
- B60K 6/405: Housings
- B60K 6/44: Series-parallel type
- B60K 6/445: Differential gearing distribution type
- B60K 6/547: the transmission being a stepped gearing
- B60W 10/02: including control of driveline clutches
- B60W 10/06: including control of combustion engines
- B60W 10/08: including control of electric propulsion units, e.g. motors or generators
- B60W 10/11: Stepped gearings
- B60W 10/111: with separate change-speed gear trains arranged in series
- 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)}
- F16H 3/728: {with means to change ratio in the mechanical gearing}
- F16H 37/042: {change gear transmissions in group arrangement}
- F16H 61/0403: {Synchronisation before shifting}
- F16H 61/682: with interruption of drive
- F16H 61/686: with orbital gears
- F16H 63/502: {for smoothing gear shifts}
- B60W 20/00: Control systems specially adapted for hybrid vehicles {(hybrid vehicle design, B60K6/00; electric vehicles B60L)}
- B60W 2710/0644: Engine speed
- B60W 2710/083: Torque
- B60Y 2200/92: Hybrid vehicles
- B60Y 2300/42: Control of clutches
- B60Y 2300/70: Control of gearings
- F16H 2200/2007: with two sets of orbital gears
- Y02T 10/62: Hybrid vehicles
- Y10S 903/911: with two or more gear sets
- Y10S 903/945: Characterized by control of gearing, e.g. control of transmission ratio
- Y10S 903/946: Characterized by control of driveline clutch
- 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
- F16H: GEARING
- 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 is provided to control a hybrid powertrain, comprising a combustion engine; a gearbox with an input shaft connected to the combustion engine and an output shaft; a first planetary gear connected to the input shaft a second planetary gear connected to the first planetary gear; first and second electrical machines respectively connected to the first and second planetary gears; first gear pair connected with the first planetary gear and the output shaft; and second gear pair connected with the second planetary gear and the output shaft. The method comprises: a) engaging gears corresponding to the first gear pair and to the second gear pair; and b) connecting a second sun wheel, arranged in the second planetary gear and a second planetary wheel carrier with each other, with the use of a second coupling device.

## Claims

### Claim 1

A method to control a hybrid powertrain, comprising a combustion engine; a gearbox with an input shaft and an output shaft, which combustion engine is connected to the input shaft; a first planetary gear, which is connected to the input shaft; a second planetary gear, connected to the first planetary gear; a first electrical machine, connected to the first planetary gear; a second electrical machine, connected to the second planetary gear; at least one first gear pair, connected with the first planetary gear and the output shaft; and at least one second gear pair, connected with the second planetary gear and the output shaft, said method comprising the steps:
a) engaging gears in the gearbox corresponding to the at least one first gear pair, which is connected with the first planetary gear, and the at least one second gear pair, which is connected with the second planetary gear and the output shaft; and
b) connecting two rotatable components in the second planetary gear with a second coupling device.

### Claim 2 (depends on 1)

A method according to claim 1, further comprising, after step a) and before step b), a step c) wherein at least one third gear pair is connected with the countershaft and the output shaft.

### Claim 3 (depends on 2)

A method according to claim 2, wherein the at least one third gear pair connected with a countershaft and the output shaft comprises a fifth and sixth cogwheel in engagement with each other, which fifth cogwheel is arranged so that it may be connected with and disconnected from the countershaft with a fifth coupling element, wherein the fifth cogwheel is connected to the countershaft in step c).

### Claim 4 (depends on 1)

A method according to claim 1, wherein step b) comprises controlling the combustion engine in such a way that a synchronous rotational speed is achieved between the two rotatable components of the second planetary gear, following which the second coupling device is shifted, and locks the two rotatable components in the second planetary gear with each other.

### Claim 5 (depends on 1)

A method according to claim 1, wherein the at least one first gear pair, which is connected with the first planetary gear and the output shaft, comprises:
a first pinion gear and a first cogwheel in engagement with each other, which first pinion gear is fixedly connected with the first planetary gear and which first cogwheel is arranged so that it may be connected with and disconnected from a countershaft; and
a third pinion gear and a third cogwheel engaged with each other, which third pinion gear is fixedly arranged with the first planetary gear and which third cogwheel is arranged so that it may be connected with or disconnected from the countershaft,
wherein in step a) the first or the third cogwheel is connected to the countershaft.

### Claim 6 (depends on 1)

A method according to claim 1, wherein the at least one second gear pair, which is connected with the second planetary gear and the output shaft, comprises:
a second pinion gear and a second cogwheel in engagement with each other, which second pinion gear is fixedly arranged with the second planetary gear and which second cogwheel is arranged so that it may be connected with and disconnected from a countershaft; and
a fourth pinion gear and a fourth cogwheel engaged with each other, which fourth pinion gear is fixedly arranged with the second planetary gear and which fourth cogwheel is arranged so that it may be connected with or disconnected from the countershaft,
wherein said method comprises a step d) occurring after step a) and before step b, wherein in said step d) the second or the fourth cogwheel is connected to the countershaft.

### Claim 7 (depends on 6)

A method according to claim 6, further comprising, after step b), the following steps are performed:
e) activating the first electrical machine, so that the first electrical machine generates a propulsion torque on the output shaft, via the at least one first gear pair, which is connected with the first planetary gear and the output shaft, and via the at least one third gear pair, which is connected with the countershaft and the output shaft;
f) disconnecting the at least one second gear pair, which is connected with the second planetary gear and the output shaft, from the countershaft which said second gear pair was connected in step d), by controlling the second electrical machine and the combustion engine, connected with the first planetary gear, in such a way that a substantially zero torque state is achieved between the at least one second gear pair, which is connected on the countershaft and which is connected with the second planetary gear and the output shaft, and the countershaft;
g) connecting the at least one second gear pair, which is connected with the second planetary gear and the output shaft which said second gear pair was not connected in step d), to the countershaft, by controlling the combustion engine in such a way that a synchronous engine speed is achieved between the at least one second gear pair, which is connected with the second planetary gear and the output shaft which said second gear pair was not connected in step d), and the countershaft; and
h) activating the combustion engine and/or the second electrical machine, so that the combustion engine and/or the second electrical machine generates a propulsion torque on the output shaft, via the at least one second gear pair, which is connected with the second planetary gear and the output shaft, and which said gear pair was not connected to the countershaft in step d).

### Claim 8 (depends on 7)

A method according to claim 7, further comprising the additional steps:
i) engaging gears corresponding to the at least one first gear pair, which is connected with the first planetary gear in the gearbox, and the at least one second gear pair, which is connected with the second planetary gear and the output shaft;
j) locking a coupling mechanism, which is arranged between the first planetary gear and the output shaft, by controlling the combustion engine, in such a way that a synchronous rotational speed is achieved between the first planetary gear and the output shaft;
k) activating the first electrical machine, so that the first electrical machine generates a propulsion torque on the output shaft via the coupling mechanism;
l) disconnecting the at least one first gear pair, which is connected with the first planetary gear and the output shaft, from the countershaft which said first gear pair was connected in step i), by controlling the second electrical machine and a combustion engine, connected with the first planetary gear, in such a way that a substantially zero torque state is achieved between the at least one first gear pair, which is connected on the countershaft and which is connected with the first planetary gear and the output shaft, and the countershaft;
m) connecting the at least one first gear pair, which is connected with the first planetary gear and the output shaft which said first gear pair was not connected in step i), with the countershaft, by controlling the combustion engine, in such a way that a synchronous rotational speed is achieved between the at least one first gear pair, which is connected with the first planetary gear and the output shaft which said first gear pair was not connected in step i), and the countershaft; and
n) controlling the second electrical machine and the combustion engine, connected with the first planetary gear, to generate a propulsion torque on the output shaft.

### Claim 9 (depends on 1)

A method according to claim 1, wherein the combustion engine is connected with the first planetary wheel carrier in the first planetary gear, which is connected with a second sun wheel, arranged in the second planetary gear.

### Claim 10 (depends on 1)

A method according to claim 1, wherein in step b) the two rotatable components in the second planetary gear comprise a second sun wheel and a second planetary wheel carrier.

### Claim 11

A vehicle with a hybrid powertrain, said hybrid powertrain comprising:
a combustion engine;
a gearbox with an input shaft and an output shaft, which combustion engine is connected to the input shaft;
a first planetary gear, which is connected to the input shaft;
a second planetary gear, connected to the first planetary gear;
a first electrical machine, connected to the first planetary gear;
a second electrical machine, connected to the second planetary gear;
at least one first gear pair, connected with the first planetary gear and the output shaft;
at least one second gear pair, connected with the second planetary gear and the output shaft; and
an electric control device configured to:
a) engage gears in the gearbox corresponding to the at least one first gear pair, which is connected with the first planetary gear, and the at least one second gear pair, which is connected with the second planetary gear and the output shaft; and
b) connect two rotatable components in the second planetary gear with a second coupling device.

### Claim 12

A computer program product comprising computer program code stored on a non-transitory computer readable medium readable by a computer, said computer program product used to control a hybrid powertrain comprising a combustion engine; a gearbox with an input shaft and an output shaft, which combustion engine is connected to the input shaft; a first planetary gear, which is connected to the input shaft; a second planetary gear, connected to the first planetary gear; a first electrical machine, connected to the first planetary gear; a second electrical machine, connected to the second planetary gear; at least one first gear pair, connected with the first planetary gear and the output shaft; and at least one second gear pair, connected with the second planetary gear and the output shaft,
said computer program code comprising computer instructions to cause one or more computer processors to perform the operations of:
a) engaging gears in the gearbox corresponding to the at least one first gear pair, which is connected with the first planetary gear, and the at least one second gear pair, which is connected with the second planetary gear and the output shaft; and
b) connecting two rotatable components in the second planetary gear with a second coupling device.