# US 10,767,759 B2 · System and method for calibrating a transmission

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- Number: US 10,767,759 B2
- Document ID: US10767759B2
- Status: Granted
- Kind: B2
- Application number: 16/140,717
- Filed: 2018-09-25
- Published: 2019-01-24
- Granted: 2020-09-08
- Earliest claimed: 2016-09-26
- Assignees: Baumann Electronic Controls, LLC
- Applicants: Baumann Electronic Controls, LLC
- Inventors: Karl William Baumann
- Web page: https://patentgrep.com/patent/US10767759B2

## CPC

- F16H 61/0204: {for gearshift control, e.g. control functions for performing shifting or generation of shift signal}
- B60K 17/02: characterised by arrangement, location, or kind of clutch
- B60K 17/08: of mechanical type
- B60K 23/00: Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for
- B60K 23/02: for main transmission clutches
- F16H 59/36: Inputs being a function of speed
- F16H 59/44: dependent on machine speed {, e.g. the vehicle speed} (F16H59/46 takes precedence)
- F16H 61/0021: {Generation or control of line pressure}
- F16D 2500/70217: Pressure
- F16H 2059/446: {Detecting vehicle stop, i.e. the vehicle is at stand still, e.g. for engaging parking lock}
- F16H 2061/0062: {Modifying an existing transmission control from a manufacturer for improvement or adaptation, e.g. by replacing a valve or an electric part}
- F16H 2061/064: {for calibration of pressure levels for friction members, e.g. by monitoring the speed change of transmission shafts}
- F16H 2342/04: Calibrating engagement of friction elements
- 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
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES

## Abstract

A method of adjusting and using operating parameters of a transmission of a vehicle may include accessing a stored list of clutch parameters, performing a dynamic condition procedure while the vehicle is driven to revise minimum on-coming apply pressure for each friction element based on a sensed performance of an element within the vehicle powertrain, storing the modified minimum on-coming apply pressures, and operating the vehicle. A related transmission control device operates a transmission using parameters obtained during a dynamic condition procedure.

## Claims

### Claim 1

A transmission control device for a vehicle having a powertrain including an engine, a transmission with a plurality of solenoid actuated friction elements, and sensors, the device comprising:
at least one connection for transmitting signals to and from the engine, the transmission, and the sensors within the vehicle; and
a memory for storing a program for adjusting and controlling the transmission and data including friction element apply pressure data, the program storing a minimum on-coming apply pressure for each of the friction elements in the memory as initial optimized values, the program directing the powertrain to perform a dynamic condition procedure while the vehicle is being driven to determine a modified minimum on-coming apply pressure for each of the friction elements based on a sensed performance of an element within the powertrain, the program storing the modified minimum on-coming apply pressures in the memory as further optimized values, after completion of the dynamic condition procedure, the program controlling the transmission during operation of the vehicle using the further optimized values.

### Claim 2 (depends on 1)

The device of claim 1, wherein the sensed performance is a ratio slip RPM ramp rate.

### Claim 3 (depends on 1)

The device of claim 1, further including a housing in which the memory is mounted and to which the at least one connection is connected.

### Claim 4 (depends on 3)

The device of claim 3, further including a user input device separate from and in communication with the housing, the user input device having a display and at least one input element.

### Claim 5 (depends on 1)

The device of claim 1, wherein the data includes a plurality of lookup tables with transmission control data stored in the memory.

### Claim 6 (depends on 1)

The device of claim 1, wherein the program directs the transmission to operate with a short-duration, high-pressure pulse to each friction element at the beginning of a shift.

### Claim 7 (depends on 1)

The device of claim 1, wherein the program directs the powertrain to perform a static condition procedure while the vehicle is stationary by incrementally increasing the on-coming apply pressure for each of the friction elements sequentially until a minimum on-coming apply pressure is determined for each of the friction elements based on a sensed friction element performance, the program storing the determined minimum on-coming apply pressures in the memory as the initial optimized values, wherein the static condition procedure is performed incrementally with increments, wherein each successive increment is no more than about 10% higher than at a respective preceding increment.

### Claim 8 (depends on 7)

The device of claim 7, wherein each successive increment is no more than about 5% higher than at a respective preceding increment.

### Claim 9 (depends on 7)

The device of claim 7, wherein during the static condition procedure, after the initial optimized values are determined using a first increment, the program again directs the powertrain to perform the static condition procedure incrementally using a second increment smaller than the first increment to determine the minimum on-coming apply pressures to be stored in the memory as the initial optimized values.

### Claim 10 (depends on 9)

The device of claim 9, wherein the first increment is about 5% higher than at a respective preceding first increment and the second increment is about 2% higher than at a respective preceding second increment.

### Claim 11 (depends on 7)

The device of claim 7, wherein the static condition procedure further includes adjusting a maximum off-going apply pressure for each of the friction elements sequentially until a maximum off-going apply pressure is determined for each of the friction elements based on a sensed slippage for each of the friction elements, and storing the determined maximum off-going apply pressures in the memory as initial optimized off-going values.

### Claim 12 (depends on 1)

The device of claim 1, wherein the dynamic condition procedure is performed incrementally with each successive increment of minimum on-coming apply pressure being no more than about 2% higher than at a respective preceding increment.

### Claim 13 (depends on 1)

The device of claim 1, wherein the dynamic condition procedure further includes determining a modified maximum off-going apply pressure for each of the friction elements based on a sensed slippage for each of the friction elements, storing the determined modified maximum off-going apply pressures in the memory as further optimized off-going values, the program controlling the transmission during operation of the vehicle using the further optimized off-going values.

### Claim 14 (depends on 1)

The device of claim 1, wherein the program dictates a fail-safe mode of parameters for disabling operation of the transmission in case of at least one of out of parameter adjustment and detection of a critical fault.

### Claim 15

A method of adjusting and using operating parameters of a transmission of a vehicle, the transmission having a plurality of friction elements, the method comprising:
accessing a stored list of clutch parameters including; a minimum on-coming apply pressure for each of the friction elements as initial optimized values in a list of clutch parameters;
performing a dynamic condition procedure while the vehicle is driven to revise the clutch parameters, the dynamic condition procedure including determining a modified minimum on-coming apply pressure for each of the friction elements based on a sensed performance of an element within the powertrain;
storing the modified minimum on-coming apply pressure as further optimized values in a revised list of clutch parameters; and
operating the vehicle using the revised list of clutch parameters.

### Claim 16 (depends on 15)

The method of claim 15, wherein the additionally adjusting step adjusts a ratio slip RPM ramp rate.

### Claim 17 (depends on 15)

The method of claim 15, further including performing a static condition procedure while the vehicle is stationary to revise the clutch parameters before performing the dynamic condition procedure, the static condition procedure including incrementally increasing the on-coming apply pressure for each of the friction elements in the transmission until the minimum on-coming apply pressure is obtained for each of the friction elements and storing the determined minimum on-coming apply pressures as the initial optimized values, wherein the static condition procedure is performed incrementally with each successive increment of minimum on-coming apply pressure being no more than about 10% higher than at a respective preceding increment.

### Claim 18 (depends on 17)

The method of claim 17, wherein each successive increment is no more than about 5% higher than at a respective preceding increment.

### Claim 19 (depends on 17)

The method of claim 17, wherein during the static condition procedure, after the initial optimized values are determined using a first increment, a second static condition procedure is performed incrementally using a second increment smaller than the first increment to determine the minimum on-coming apply pressures to be stored in the memory as the initial optimized values.

### Claim 20 (depends on 19)

The method of claim 19, wherein the first increment is about 5% higher than at a respective preceding first increment and the second increment is about 2% higher than at a respective preceding second increment.

### Claim 21 (depends on 17)

The method of claim 17, wherein the static condition procedure further includes adjusting a maximum off-going apply pressure for each of the friction elements sequentially until a maximum off-going apply pressure is determined for each of the friction elements based on a sensed slippage for each of the friction elements, the method further including storing the determined maximum off-going apply pressures as initial optimized off-going values in the revised list of clutch parameters.

### Claim 22 (depends on 15)

The method of claim 15, wherein the dynamic condition procedure is performed incrementally with each successive increment of minimum on-coming apply pressure being no more than about 2% higher than at a respective preceding increment.

### Claim 23 (depends on 15)

The method of claim 15, wherein the dynamic condition procedure further includes determining a modified maximum off-going apply pressure for each of the friction elements based on a sensed slippage for each of the friction elements, the method further including storing the determined modified maximum off-going apply pressures as further optimized off-going values in the further revised list of clutch parameters.

### Claim 24 (depends on 15)

The method of claim 15, further including dictating a fail-safe mode of parameters for disabling operation of the transmission in case of at least one of out of parameter adjustment and detection of a critical fault.

### Claim 25 (depends on 15)

The method of claim 15, further including adjusting in a real-time, closed-loop manner a pressure ramp rate during the execution of a shift.

### Claim 26 (depends on 15)

The method of claim 15, further including controlling the transmission so as to selectively start in a gear other than a lowest forward gear.

### Claim 27 (depends on 15)

The method of claim 15, further including adjusting the transmission so as to lock the transmission while the vehicle is stopped by applying a plurality of the friction elements.

### Claim 28 (depends on 15)

The method of claim 15, wherein the clutch parameters include a maximum off-going apply pressure for each of the friction elements.

### Claim 29 (depends on 15)

The method of claim 15, the method also including additionally adjusting the clutch parameters after the dynamic condition procedure based on shift feel.