# US 2017/0282701 A1 · Method to control a hybrid powertrain, vehicle comprising such a hybrid powertrain, computer program to control such a hybrid powertrain, and a computer program product comprising program code

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- Number: US 2017/0282701 A1
- Document ID: US20170282701A1
- Status: Published application
- Kind: A1
- Application number: 15/511,589
- Filed: 2015-09-29
- Published: 2017-10-05
- Earliest claimed: 2014-09-29
- Assignees: Scania CV AB
- Applicants: Scania CV AB
- Inventors: Mikael BERGQUIST; Mathias BJÖRKMAN; Johan LINDSTRÖM; Niklas PETTERSSON
- Web page: https://patentgrep.com/patent/US20170282701A1

## CPC

- B60K 6/365: with the gears having orbital motion
- 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 10/111: with separate change-speed gear trains arranged in series
- B60W 20/00: Control systems specially adapted for hybrid vehicles {(hybrid vehicle design, B60K6/00; electric vehicles B60L)}
- 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)}
- 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 30/19: Improvement of gear change, e.g. by synchronisation or smoothing gear shift
- F16H 61/0403: {Synchronisation before shifting}
- F16H 61/686: with orbital gears
- F16H 61/688: with two inputs, e.g. selection of one of two torque-flow paths by clutches
- F16H 61/702: {using electric or electrohydraulic control means}
- F16H 63/502: {for smoothing gear shifts}
- B60W 2710/0644: Engine speed
- B60W 2710/083: Torque
- B60W 2710/1005: Transmission ratio engaged
- F16H 3/728: {with means to change ratio in the mechanical gearing}
- F16H 37/046: {with an additional planetary gear train, e.g. creep gear, overdrive}
- F16H 2003/008: {comprising means for selectively driving countershafts}
- F16H 2037/102: {the input or output shaft of the transmission is connected or connectable to two or more differentials}
- F16H 2061/6602: {with at least two dynamo-electric machines for creating an electric power path inside the transmission device, e.g. using generator and motor for a variable power torque path}
- F16H 2200/201: with three sets of orbital gears
- F16H 2306/44: Removing torque from current gears
- Y02T 10/62: Hybrid vehicles
- 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
- F16H: GEARING
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A method is provided to control a hybrid powertrain comprising an internal combustion engine; a gearbox with input and output shafts; a range gearbox connected to the 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, respectivley connected to the first and second planetary gears; a gear pair connected with the first planetary gear and the output shaft; and a gear pair, connected with the second planetary gear and the output shaft, wherein the internal combustion engine is connected to the input shaft. The method comprises: a) engaging a gear by connecting two rotatable components in the first planetary gear; b) connecting the second or the fourth gear pair; c) connecting a sixth gear pair, arranged between a countershaft and the range gearbox to the countershaft, so that the countershaft is connected with the output shaft via the range gearbox; d) synchronising the rotational speed between two rotatable components in the range gearbox; e) connecting the rotatable components with a shiftable third clutch device; and f) engaging a gear by way of connecting two rotatable components in the second planetary gear.

## Claims

### Claim 1

A method to control a hybrid powertrain, in order to achieve a shift from a low range position to a high range position, wherein the hybrid powertrain comprises an internal combustion engine; a gearbox with an input shaft and an output shaft; a range gearbox connected with the output shaft a first planetary gear 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 gear pair connected with the first planetary gear and the output shaft; and at least one gear pair connected with the second planetary gear and the output shaft wherein the internal combustion engine is connected with the first planetary gear via the input shaft said method comprising:
a) engaging a gear by way of connecting two rotatable components in the first planetary gear;
b) connecting the at least one gear pair connected with the second planetary gear and the output shaft;
c) connecting a sixth gear pair arranged between a countershaft and the range gearbox with the countershaft so that the countershaft is connected with the output shaft via the range gearbox;
d) synchronizing the rotational speed between two rotatable components in the range gearbox with the help of a synchronization device;
e) connecting the rotatable components via a shiftable third clutch device; and
f) engaging a gear by way of connecting two rotatable components in the second planetary gear.

### Claim 2 (depends on 1)

A method according to claim 1, further comprising:
following step e) and before step f):
g) controlling the internal combustion engine, in such a manner that a synchronous rotational speed arises between two rotatable components in the second planetary gear.

### Claim 3 (depends on 1)

A method according to claim 1, wherein in steps d) and e), the two rotatable components in the range gearbox which are connected with the use of the third clutch device consist of a third ring gear and a third planetary wheel carrier in a third planetary gear.

### Claim 4 (depends on 1)

A method according to claim 1 further comprising:
before step a):
h) preventing a rotatable component in the range gearbox from rotating; and
following step c) and before step d):
i) allowing the rotatable component in the range gearbox to rotate.

### Claim 5 (depends on 4)

A method according to claim 4, wherein in step h) connecting the first planetary gear with an input shaft to the range gearbox via a clutch mechanism, and in step i) disconnecting, with the use of the clutch mechanism, the first planetary gear from the input shaft to the range gearbox.

### Claim 6 (depends on 4)

A method according to claim 4, wherein during steps i) and d), the internal combustion engine and the first and/or second electrical machine are controlled in such a way that a torque free state is achieved between the first planetary gear and the input shaft to the range gearbox, following which the first planetary gear is disconnected from the input shaft to the range gearbox via the clutch mechanism.

### Claim 7 (depends on 6)

A method according to claim 6, wherein during steps i) and d), the first electrical machine generates electric power, which operates the second electrical machine, which does not generate electric power.

### Claim 8 (depends on 4)

A method according to claim 4, during steps i) and d), a torque is generated via the second electrical machine.

### Claim 9 (depends on 1)

A method according to claim 1, wherein in step c) the sixth gear pair is connected to the countershaft by way of a synchronous rotational speed being generated between the countershaft and a seventh cogwheel arranged in the sixth gear pair on the countershaft with the second electrical machine.

### Claim 10 (depends on 1)

A method according to claim 1, wherein the at least one gear pair, which is connected with the first planetary gear, comprises a pinion gear and a cogwheel in engagement with each other, which pinion gear is fixedly arranged with the first planetary gear and which cogwheel is arranged on a countershaft in such a way that it may be connected and disconnected, and wherein at step b) the cogwheel is disconnected from the countershaft.

### Claim 11 (depends on 1)

A method according to claim 1, wherein characterised in that the at least one gear pair, which is connected with the second planetary gear comprises a pinion gear and a cogwheel in engagement with each other, which pinion gear is fixedly arranged with the second planetary gear and which cogwheel is arranged on a countershaft in such a way that it may be connected and disconnected, and wherein in step b) the cogwheel is connected to the countershaft.

### Claim 12 (depends on 1)

A method according to claim 1 further comprising a fifth gear pair, which comprises a fifth and sixth cogwheel in engagement with each other, which fifth cogwheel is arranged to be connected and disconnected on the countershaft with the use of a fifth clutch element, wherein, in step b), the fifth cogwheel is disconnected from the countershaft.

### Claim 13 (depends on 1)

A method according to claim 1, wherein the output shaft of the internal combustion engine is connected with a planetary wheel carrier arranged in the first planetary gear.

### Claim 14

A vehicle with a hybrid powertrain, comprising an internal combustion engine; a gearbox with an input shaft and an output shaft; a range gearbox, connected to the output shaft; a first planetary gear 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 gear pair connected with the first planetary gear and the output shaft; and at least one gear pair connected with the second planetary gear and the output shaft, wherein the internal combustion engine is connected with the first planetary gear via the input shaft, wherein the hybrid powertrain is controlled according to a method comprising:
a) engaging a gear by way of connecting two rotatable components in the first planetary gear;
b) connecting the at least one gear pair connected with the second planetary gear and the output shaft;
c) connecting a sixth gear pair arranged between a countershaft and the range with the countershaft, so that the countershaft is connected with the output shaft via the range gearbox;
d) synchronizing the rotational speed between two rotatable components in the range gearbox with the help of a synchronization device;
e) connecting the rotatable components via a shiftable third clutch device; and
f) engaging a gear by way of connecting two rotatable components in the second planetary gear.

### Claim 15

(canceled)

### Claim 16

A computer program product comprising program code stored in a non-transitory computer-readable medium readable by a computer, said computer program product used to control a hybrid powertrain, in order to achieve a shift from a low range position to a high range position, wherein the hybrid powertrain comprises an internal combustion engine; a gearbox with an input shaft and an output shaft; a range gearbox connected with the output shaft a first planetary gear 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 gear pair connected with the first planetary gear and the output shaft; and at least one gear pair connected with the second planetary gear and the output shaft wherein the internal combustion engine is connected with the first planetary gear via the input shaft, said computer program code comprising computer instructions to cause one or more computer processors to perform the operations of:
a) engaging a gear by way of connecting two rotatable components in the first planetary gear;
b) connecting the at least one gear pair connected with the second planetary gear and the output shaft;
c) connecting a sixth gear pair arranged between a countershaft and the range gearbox with the countershaft so that the countershaft is connected with the output shaft via the range gearbox;
d) synchronizing the rotational speed between two rotatable components in the range gearbox with the help of a synchronization device;
e) connecting the rotatable components via a shiftable third clutch device; and
f) engaging a gear by way of connecting two rotatable components in the second planetary gear.