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Toyota’s New Hybrid Unit “L4A0”
Technical Paper
2022-01-0656
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Toyota developed a new hybrid unit “L4A0” for the new Tundra, which creates both good drivability and environmental performance. To ensure off-road, towing performance and typical truck driving characteristics, the unit is based on a transmission with a torque converter and a multi-plate lock up clutch, with a motor-generator and K0 clutch installed between the engine and transmission. The motor-generator and K0 clutch are built into a module, making it possible to create new hybrid units by combining the module with various transmissions. The unit features many different motor controls. For example, in the case of step-in acceleration input, in order to achieve the desired output torque, typically a kick-down shift is necessary [1]; however, by utilizing “L4A0” both high response and high power output is achieved even without a kick-down shift. This is accomplished by assisting the engine with the motor-generator even when the engine torque is delayed at low engine speeds. Simultaneously, this contributed to better fuel economy by allowing the engine to work at optimum speeds [1-3]. Another feature is the high-response and shock-less engine start that is achieved by cranking the engine with the motor-generator via the K0 clutch.
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Authors
- Guodong Tan - Toyota Motor Corporation
- Masashi Ikemura - Toyota Motor Corporation
- Yoshio Hasegawa - Toyota Motor Corporation
- Takao Ohki - Toyota Motor Corporation
- Masayuki Baba - Toyota Motor Corporation
- Atsuro Nakamura - Toyota Motor Corporation
- Craig Herring - Toyota Motor North America
- Atsushi Niinomi - AISIN Corporation
- Makoto Hamano - AISIN Corporation
- Yasuhiro Mizoguchi - AISIN Corporation
Citation
Tan, G., Ikemura, M., Hasegawa, Y., Ohki, T. et al., "Toyota’s New Hybrid Unit “L4A0”," SAE Technical Paper 2022-01-0656, 2022, https://doi.org/10.4271/2022-01-0656.Also In
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