# US 8,788,162 B2 · Shifting control for a hybrid vehicle

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- Number: US 8,788,162 B2
- Document ID: US8788162B2
- Status: Granted
- Kind: B2
- Application number: 13/240,081
- Filed: 2011-09-22
- Published: 2012-06-07
- Granted: 2014-07-22
- Earliest claimed: 2010-12-03
- Assignees: Hyundai Motor Company; Kia Motor Corporation
- Applicants: Joonyoung Park
- Inventors: Joonyoung Park
- Web page: https://patentgrep.com/patent/US8788162B2

## CPC

- B60W 20/00: Control systems specially adapted for hybrid vehicles {(hybrid vehicle design, B60K6/00; electric vehicles B60L)}
- B60K 6/365: with the gears having orbital motion
- B60K 6/445: Differential gearing distribution type
- 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 10/105: of electric type
- B60W 10/113: with two input flow paths, e.g. double clutch transmission selection of one of the torque flow paths by the corresponding input clutch
- B60W 30/20: Reducing vibrations in the driveline
- F16H 61/20: Preventing gear creeping {; Transmission control during standstill, e.g. hill hold control}
- F16H 63/50: Signals to an engine or motor
- F16H 3/728: {with means to change ratio in the mechanical gearing}
- F16H 2037/088: {Power-split transmissions with summing differentials, with the input of the CVT connected or connectable to the input shaft}
- F16H 2037/104: {Power-split transmissions with at least one end of a CVT connected or connectable to two or more differentials}
- F16H 2061/6603: {characterised by changing ratio in the mechanical gearing}
- Y02T 10/62: Hybrid 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
- 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
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A system and method for shifting a hybrid vehicle is provided which utilizes one or more controllers to release one or more clutches and brakes when a transmission is shifted into neutral or park and then prevents a rotational element from being rotated by controlling an engine and a motor/generator when the transmission is in neutral or park. Accordingly, shift shock or slip is minimized when a transmission is shifted from a park or a neutral to a drive or a reverse, thus improving a shifting feeling and safety of the vehicle.

## Claims

### Claim 1

A shifting control method of a hybrid vehicle, comprising:
releasing one or more clutches and brakes of a transmission when the transmission is put in a neutral position; and
controlling an engine and motor, by a controller, to prevent a rotational element of the transmission from rotating when the one or more clutches and one or more brakes of the transmission are in the neutral position until the transmission is subsequently shifted into drive or reverse by calculating a target speed of a first motor, wherein a first calculation is used by the controller to calculate the target speed of the motor when a transmission output shaft speed is greater than a predetermined value and a second calculation is used by the controller to calculate the target speed of the motor when a transmission output shaft speed is less than a predetermined value.

### Claim 2 (depends on 1)

The shifting control method of a hybrid vehicle of claim 1, wherein the rotational element is a ring gear of a planetary gear unit.

### Claim 3

A shifting control method of a hybrid vehicle, comprising:
releasing clutches and brakes to place a transmission in a neutral state; and
controlling a speed of a motor by calculating a target speed of a first motor, wherein a first calculation is used by the controller to calculate the target speed of the motor when a transmission output shaft speed is greater than a predetermined value and a second calculation is used by the controller to calculate the target speed of the motor when a transmission output shaft speed is less than a predetermined value,
wherein based on the control the rotational speed of at least two rotational elements of the transmission, which are to be engaged with each other, are equalized when a transmission is subsequently shifted into drive or reverse.

### Claim 4 (depends on 3)

The shifting control method of a hybrid vehicle of claim 3, wherein at least one of the two rotational elements is a ring gear of a planetary gear unit.

### Claim 5

A system for shifting a hybrid vehicle, the system comprising:
an engine operably connected a first carrier of a first planetary gear unit;
a first motor operably connected to a first ring gear of the first planetary gear unit;
a second motor operably connected to a second sun gear of a second planetary gear unit; and
a controller configured to release one or more brakes and clutches when a transmission is shifted into park or neutral, determine whether a second brake for stopping a second ring gear of the second planetary gear unit is to be operated, and whether a first clutch for directly connecting the first carrier with the first ring gear of the first planetary gear unit is to be operated when the transmission is subsequently shifted into drive or reverse to prepare the transmission for shifting into drive or reverse, and prevent the second ring gear from moving by controlling the engine and the first motor, wherein the first motor is speed-controlled by calculating a target speed of a first motor, wherein a first calculation is used by the controller to calculate the target speed of the motor when a transmission output shaft speed is greater than a predetermined value and a second calculation is used by the controller to calculate the target speed of the motor when a transmission output shaft speed is less than a predetermined value.

### Claim 6 (depends on 5)

The system of claim 5, wherein the controller is further configured to control the engine, the first motor, and the second motor so that a rotational speed of the second ring gear is equal to an output speed of the engine, if it is determined that the engine is connected to the second ring gear through the second clutch.

### Claim 7 (depends on 6)

The system of claim 6, wherein the controller is further configured to control the engine, the first motor, and the second motor such that a rotation speed of the second ring gear is equal to an output speed of the engine, if an output speed of the transmission is larger than a predetermined value.

### Claim 8 (depends on 6)

The system of claim 6, wherein a speed of the first motor is feedback controlled.

### Claim 9 (depends on 6)

The system of claim 6, wherein the controller is further configured to control the engine, the first motor, and the second motor such that the second ring gear is not rotated, if an output speed of a transmission is less than a predetermined value.

### Claim 10

A system for shifting a hybrid vehicle, the system comprising;
a first planetary gear unit having a first sun gear, a first planetary gear, a first ring gear, and a first carrier;
a second planetary gear unit having a second sun gear that rotate together with the first sun gear, a second planetary gear, a second ring gear, and a second carrier that transfers a toque to an output shaft;
an engine that is disposed to rotate the first carrier of the first planetary gear unit;
a first motor that is disposed to rotate the first ring gear;
a second motor that is disposed to rotate the second sun gear;
a first brake that is disposed to stop a rotation of the first motor and the first ring gear;
a first clutch that is disposed to connect the first carrier with the first ring gear such that they rotate together;
a second clutch that is disposed to connect the first carrier with the second ring gear such that they rotate together;
a second brake that is disposed to selectively stop a rotation of the second ring gear; and
one or more controllers configured to release the first/second brakes and the first/second clutches, determine whether the first brake is to be operated or the second clutch is to be operated so as to prepare the transmission to be shifted into drive or reverse, and control the engine, the first motor, and the second motor such that the second ring gear is not rotated when the first brake is to be operated,
wherein a speed of the first motor is controlled by calculating a target speed of the first motor, wherein a first calculation is used by the controller to calculate the target speed of the motor when a transmission output shaft speed is greater than a predetermined value and a second calculation is used by the controller to calculate the target speed of the motor when a transmission output shaft speed is less than a predetermined value.

### Claim 11 (depends on 10)

The system of claim 10, wherein the one or more controllers are further configured to control the engine, the first motor, and the second motor such that an output speed of the engine is equal to a rotation speed of the second ring gear, if it is determined that the second clutch is to be operated.