Lorne W Tweed

55837662, Dec 10, 1996

Dec 7, 1994

8/350773

Charles W. Birchenough - Morton IL
Kenneth P. Liesener - Peoria IL
Lorne W. Tweed - Peoria IL

Caterpillar Inc. - Peoria IL

B60K 4108

364424

A control system is provided for a vehicle regulating engine speed during shifts so as to reduce driveline torque and shift shock. The control system includes separate microprocessor based engine and transmission controllers which communicate via a data link. When a shift is initiated, the transmission controller delays a first period of time CTSDELAY sufficient for the transmission to disengage the old gear ratio and then produces a CTSSPEED signal. The transmission controller continues to produce the CTSSPEED signal for a second period of time CTSDUR which corresponds to the time required for the transmission to engage the new gear ratio. The engine controller receives the desired engine speed signal and regulates engine speed into correspondence with the desired speed. During upshifts, the CTSSPEED signal is set to a speed which is a predetermined amount above the synchronization speed of the new gear for an upshift. Conversely, during downshifts, the CTSSPEED is set to a speed which is a predetermined amount below the synchronization speed in the new gear.

55946437, Jan 14, 1997

Apr 18, 1995

8/425680

Charles W. Birchenough - Morton IL
Hans P. Dietz - Champaign IL
Dwight S. Holloway - Chillicothe IL
Noel J. Rytter - Dunlap IL
Rolland D. Scholl - Dunlap IL
Lorne W. Tweed - Peoria IL

Caterpillar Inc. - Peoria IL

G06F 1900
F16H 5974

36442408

The present invention provides a sensing system and method for providing information relating to a drivetrain during shifting operations. The drivetrain includes an engine, a torque converter and a transmission. The system includes sensors for detecting the output speed of the engine, the output speed of the torque converter, and the output speed of the transmission. The system detects the starting condition of a shifting operation, responsively determines a set of performance parameters, and produces a set of performance parameter signals.

53458419, Sep 13, 1994

Oct 2, 1992

7/955632

Lorne W. Tweed - Peoria IL
Timothy A. Cross - Metamora IL
William M. McClure - East Peoria IL
Brian T. Rolli - Peoria IL

Caterpillar Inc. - Peoria IL

B60K 4104

477113

The present invention provides a control which automatically elevates engine speed to a preselected value when the vehicle coasting in neutral above a preselected speed. In order to accomplish this objective, the engine controller is adapted to receive an actual gear ratio signal and a vehicle speed signal, If the vehicle is in neutral and engine speed is above a preselected threshold, the controller sets the desired engine speed to a preselected value which has been empirically determined to ensure sufficient transmission cooling and lubrication, Controlling to this speed also reduces transmission wear when the transmission is reengaged at high ground speeds.

53236670, Jun 28, 1994

Oct 2, 1992

7/955640

Lorne W. Tweed - Peoria IL
Michael B. Brennemann - Pekin IL
Kevin D. King - Peoria IL
William M. McClure - Peoria IL
William J. Tate - Peoria IL

Caterpillar Inc. - Peoria IL

B60K 4108

477107

A control system is provided for a vehicle regulating engine speed during shifts so as to reduce driveline torque and shift shock. The control system includes separate microprocessor based engine and transmission controllers which communicate via a data link. When a shift is initiated, the transmission controller delays a period of time sufficient for the transmission to disengage the old gear ratio and then produces a CTSSPEED signal. The transmission controller continues to produce the CTSSPEED signal for a second period of time which corresponds to the time required for the transmission to engage the new gear ratio. The engine controller receives the desired engine speed signal and regulates engine speed into correspondence with the desired speed. During upshifts, the CTSSPEED signal is set to a speed which is a predetermined amount above the synchronization speed of the new gear for an upshift. Conversely, during downshifts, the CTSSPEED is set to a speed which is a predetermined amount below the synchronization speed in the new gear.