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In previous studies(1)(2), the acceleration performance of vehicles equipped with torque converter has been analysed with the assumption that the converter characteristic was under continued steady-state. However, in case of sharp acceleration of the fluid flow in the converter from inactive flow condition, which would occur at wide-open throttle starting, it is not possible to accurately analyse the vehicle performance at immediately after starting if the converter characteristic is assumed to remain under steady-state condition. In this paper, the transient phenomenon in the converter is verified by applying the theory of angular momentum and the concept of energy balance through the converter elements providing with a dynamic-model for the driveline. The present study has clarified the effect of the transient converter characteristic, at sharp starting, on the acceleration performance.

Mitsubishi Motors has developed the INVECS-H 4-speed (F4A4 model) and 5-speed (F5A5 model) automatic transaxles with electronic control for FWD passenger cars These transaxles feature simplified construction and lighter weight by employing clutch-to-clutch shifting, where the release clutch is directly changed over to the apply clutch during shifting Moreover, an innovative shift-schedule control has been incorporated in the transaxles so that the gear selection can be properly achieved in response to driving conditions and driving habits of individual drivers In addition, the transaxles have an additional feature of “SPORTY MODE”, in which the driver can choose a dynamic drive feel as is available in a manual transmission vehicle

This paper refers to the results of a study on the usefulness of simulation techniques based on both modeling and experiments of electro-hydraulic systems using an on-off solenoid valve controlled by pulse width modulation for an automatic transmission. By this simulation, the pressure dynamics in a hydraulic circuit and the movement of a clutch piston were analyzed assuming the flow of the hydraulic circuit to be a one-dimensional compressible flow, and considering the non-linear spring characteristics of a clutch. As a result, in comparison with the experiments, the validity of this calculation has been confirmed.