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Electronic Control of a 4-Speed Automatic Transmission with Lock-Up Clutch
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English
Abstract
The paper describes the electronic control of an automatic 4-speed transmission with lock-up clutch. As compared to purely hydraulically controlled transmissions, this control offers a clearly improved quality of shifting and the possibility of achieving improvements in fuel consumption thanks to a special economy program.
The electronic control unit is a Bosch MOTRONIC which has been expanded to include the functions of transmission control. A special feature is the engine torque control which is implemented by way of retarding the ignition when shifting. This opens up an additional degree of freedom for optimizing a transmission in terms of shift comfort, life of the friction elements and the power which can be transmitted.
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Citation
Schwab, M., "Electronic Control of a 4-Speed Automatic Transmission with Lock-Up Clutch," SAE Technical Paper 840448, 1984, https://doi.org/10.4271/840448.Also In
References
- Taga Yutaka et al Toyota Computer Controlled Four-Speed Automatic Transmission SAE 820740
- Renault Car to Get Computer Transmission WARD'S Engine Update 8 7 1982
- Dach H. The Development of ZF's 4 HP 22 Four-Speed Automatic Transmission ATZ Automobiltechnische Zeitschrift 85 1983 6
- Lorenz K. Larisch R. Application of the 4 HP 22 Four-Speed Automatic Transmission with Electronic/Hydraulic Control ATZ Automobiltechnische Zeitschrift 85 1983 6
- Gorille I. Digital Engine Control for European Cars SAE 80165