China
Africa
Explore chapters and articles related to this topic
Semiautomatic and Automatic Transmission
Published in G. K. Awari, V. S. Kumbhar, R. B. Tirpude, Automotive Systems, 2021
G. K. Awari, V. S. Kumbhar, R. B. Tirpude
In an AMT or automatic transmission, gear shifting and clutch/gears actuation is done automatically without the involvement of the driver. The actuation of the gear shift and the clutch depends on the engine load and vehicle speed. The control of clutch and gear assemblies is achieved with electrohydraulic or electric actuators controlled by dedicated electronic control modules (ECM) for transmission control system. The electrohydraulic module consists of a pump (with electric motor), hydraulic pressure accumulator, fluid reservoir, a solenoid valves block, gear selection and engagement position sensors and the fluid pressure sensor.
Mode switching analysis and control for a parallel hydraulic hybrid vehicle
Published in Vehicle System Dynamics, 2021
Shilei Zhou, Paul Walker, Yang Tian, Nong Zhang
The structure of the PHHV is shown in Figure 1 [2]. A hydraulic driving system is added on a traditional internal combustion engine powertrain. In the conventional engine powertrain, the engine output torque is transferred to wheels through the clutch, automated manual transmission (AMT), driveshaft, differential and halfshafts. The hydraulic driving system consists of a high-pressure accumulator, a low-pressure accumulator, a HPM and a control valve. Energy is stored in the high-pressure accumulator by compressing the inert gas. The swashplate in HPM is used to control the HPM working mode. The value of the HPM output torque is controlled through changing the swashplate angle. When the HPM works as a motor, the high-pressure oil flows from the high-pressure accumulator to the low-pressure accumulator and drives the driveshaft. Under braking conditions, the HPM switches to the pump mode. Oil is pumped from the low-pressure accumulator to the high-pressure accumulator so that the vehicle kinetic energy is recovered and stored in the high-pressure accumulator. To match the speeds of the HPM and vehicle drive shaft, an HPM gear is adopted. The HPM clutch is used to disengage the HPM from driveline under high vehicle speed to avoid the HPM overspeed.