# US 10,479,182 B2 · Shift control system for vehicle

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,479,182 B2
- Document ID: US10479182B2
- Status: Granted
- Kind: B2
- Application number: 15/902,546
- Filed: 2018-02-22
- Published: 2018-08-30
- Granted: 2019-11-19
- Earliest claimed: 2017-02-24
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Junichi Shiozaki
- Web page: https://patentgrep.com/patent/US10479182B2

## CPC

- B60K 6/387: Actuated clutches, i.e. clutches engaged or disengaged by electric, hydraulic or mechanical actuating means
- B60K 6/445: Differential gearing distribution type
- B60W 10/06: including control of combustion engines
- B60W 20/19: for achieving enhanced acceleration
- B60W 30/19: Improvement of gear change, e.g. by synchronisation or smoothing gear shift
- B60W 30/20: Reducing vibrations in the driveline
- F02D 41/023: {in relation with the gear ratio shifting (conjoint control for improving gear change B60W30/19)}
- F02P 5/1504: {with particular means during a transient phase, e.g. acceleration, deceleration, gear change (during starting F02P5/1506)}
- F16H 3/666: {with intermeshing orbital gears (F16H3/663 takes precedence)}
- F16H 61/061: {using electric control means}
- B60W 2050/0014: {Adaptive controllers}
- B60W 2510/0604: Throttle position
- B60W 2510/1025: Input torque
- B60Y 2300/20: Reducing vibrations in the driveline
- F16D 2500/3065: Torque of the engine
- F16D 2500/3109: Vehicle acceleration
- F16D 2500/50293: Reduction of vibrations
- F16H 2061/0462: {by controlling slip rate during gear shift transition}
- 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
- F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W)
- F02P: IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES ({anti-pollution means for internal-combustion engines F02B17/00}; specially adapted for rotary-piston or oscillating-piston engines F02B53/12; {ignition of gas turbine plants F02C7/26; ignition of jet propulsion plants F02K9/95; starting of combustion engines F02N9/00}; ignition of combustion apparatus in general, glowing plugs F23Q; measuring of physical variables in general G01; controlling in general G05; data processing in general G06; electrical components in general see Section H; {ignition coils H01F38/12}; sparking plugs H01T13/00)
- F16H: GEARING
- B60Y: INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES

## Abstract

A shift control system includes a controller that controls a transmission and a hydraulic controller. During an inertia phase where an input speed of the transmission changes toward a synchronous speed in a gear stage after a shift, the controller sets an oil pressure of a specific frictional engagement of a plurality of frictional engagement devices to an oil pressure that, at a time of the shift, exceeds a first oil pressure to set a transmission torque capacity equal to a first drive torque applied to the specific frictional engagement device of a drive torque outputted from a prime mover, but is less than a second oil pressure to set a transmission torque capacity equal to a second drive torque which is the first drive torque to which has been added an inertia torque generated by inertia on a prime mover side accompanying a change in speed ratio.

## Claims

### Claim 1

A shift control system for vehicle, comprising:
a plurality of engagement devices set to torque capacities based on oil pressures supplied;
a geared transmission coupled to an output shaft of a prime mover and including the plurality of engagement devices;
a hydraulic controller that controls the oil pressures with respect to the plurality of engagement devices in order to shift a gear stage of the transmission to another gear stage having a different speed ratio; and
a controller that controls the transmission,
wherein the controller is configured so that, during a shift of the transmission, in an inertia phase where an input speed of the transmission changes toward a synchronous speed in a gear stage after the shift, the controller controls an oil pressure of a predetermined engagement device to be engaged to establish the gear stage after the shift, and
in the inertia phase, the oil pressure of the predetermined engagement device is set to an oil pressure which is higher than a first oil pressure to set a torque capacity for transmitting from the prime mover a first drive torque acting on the predetermined engagement device, but lower than a second oil pressure to set a torque capacity for transmitting a second drive torque which is a total of an inertia torque caused by a change in speed of the prime mover and the first drive torque.

### Claim 2 (depends on 1)

The shift control system for vehicle according to claim 1, wherein
the predetermined engagement device is maintained in an engaged state before and after the shift.

### Claim 3 (depends on 1)

The shift control system for vehicle according to claim 1, wherein
the predetermined engagement device is completely engaged by having an engagement oil pressure of the predetermined engagement device boosted earliest of the engagement devices to be engaged after the shift.

### Claim 4 (depends on 1)

The shift control system for vehicle according to claim 1, wherein
the first oil pressure includes a theoretical value found based on a torque acting on the predetermined engagement device, and
the second oil pressure includes an oil pressure to set a torque capacity for transmitting a torque calculated by multiplying the theoretical value by a predetermined safety factor.

### Claim 5 (depends on 1)

The shift control system for vehicle according to claim 1, further comprising:
a detector that detects a speed difference between an input member by which a drive torque is transmitted from the prime mover in the predetermined engagement device and an output member engaged with the input member,
wherein the inertia phase includes a synchronous phase where the speed difference will be in a range exceeding a first threshold value, but being less than a second threshold value that has a larger value than the first threshold value.

### Claim 6 (depends on 1)

The shift control system for vehicle according to claim 1, further comprising:
a torque converter provided on an input side of the transmission,
wherein the torque converter includes a lockup clutch that, by engaging, transmits unchanged to the transmission a torque of the prime mover, and
the controller is configured to engage the lockup clutch in the inertia phase.