Development of Shift Control System for Multi Stage Hybrid Transmission

Paper #:
  • 2017-01-1150

Published:
  • 2017-03-28
Abstract:
Toyota Motor Corporation has developed Multi Stage Hybrid System for Lexus flagship coupe LC500h, which is designed to achieve an excellent balance between fuel economy and acceleration performance. Multi Stage Hybrid Transmission has four-stage shift device straight after power split device with generator and motor. Compared with the existing Hybrid System, fuel economy is improved by reducing electric loss in optimal gears depending on driving range, and acceleration performance is improved by increasing driving force at low and medium vehicle speed in lower gears. In addition, the wider range of power split device cooperated with four-stage shift device enables not only continuously variable transmission mode but also ten-speed automatic transmission mode. At middle and high load operation, direct shift feeling improves driving pleasure as hybrid vehicle. However, it is very difficult to control the multi degrees of freedom system which is composed of engine, generator, motor and four-stage shift device during shifting by a conventional way of calibration because each component interacts each other. In addition, hybrid’s particular constrains, such as battery limitation, may have effects on shift performance. This paper describes the shift control system for Multi Stage Hybrid Transmission to resolves the issues described above.
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