This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Smooth Gear Shift Control System Using Estimated Torque
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 01, 1994 by SAE International in United States
Annotation ability available
An automotive powertrain total control system using estimated output shaft torque has been investigated in order to enhance drivability and improve fuel economy. The system provides efficient control for both the engine and transmission which leads to an enhancement in drivability by reducing shocks during gear shifts.
This paper describes a new smooth gear shift control method using the total control system. By use of the estimated output shaft torque, it is possible to detect accurately the fluctuation condition and the start time of the inertia phase, which are important factors affecting shock occurrence. Torque feedback, got from estimated torque, was applied to the control of engine output shaft torque during shifts. The optimum hydraulic pressure, also got from estimated torque, was applied to the clutch of the transmission during shifts. The estimated output shaft torque of a hydraulic torque converter was calculated using the input/output shaft speed signal of the hydraulic torque converter and the hydraulic torque converter characteristics.
A test vehicle utilizing an electronically controlled throttle valve was developed to verify the new smooth gear shift control method. The total control system reduced shock during 1-2 upshift by nearly 35%.
|Technical Paper||Development of Smooth Shift Control System with Output Torque Estimation|
|Technical Paper||Electronic Control of a 4-Speed Automatic Transmission with Lock-Up Clutch|
|Technical Paper||Torque Converter Clutch Slip Control System|
CitationMinowa, T., Kimura, H., Ishii, J., Morinaga, S. et al., "Smooth Gear Shift Control System Using Estimated Torque," SAE Technical Paper 941013, 1994, https://doi.org/10.4271/941013.
- Lorenz K. et al. Interactive Engine and Transmission Control International Congress on Transportation Electronics 1988
- Hiramatsu T. et al. Shift Quality Control of Electronically Controlled Four Speed Automatic Transmission XXI FISITA 2 1986
- Hojo Y. et al. Toyota Five-Speed Automatic Transmission with Application Modern Control Theory SAE Paper 920610 1992
- Holzinger O. Leonhard R. Automotive Electronics - Integration and Partitioning Convergence '92 International Congress Transportation Electronics 92c028 1992
- Nakamura H. et al. An Axle Torque Control Scheme Using a Model Matching Control Method Nissan Technical Paper 1990
- Minowa T. et al. Improvement in Torque Response during Acceleration by Using a Control System with Intake Manifold Models JSAE Review Vol 13 1 1992
- Society of Automotive Engineers of Japan Foundation and Theory 91 93 1990