This study examines a system and related control method for suspending engine idling when a vehicle is at rest with the CVT in the Drive range and the driver is depressing the brake pedal. The application of this non-idling system to a CVT equipped vehicle gives rise to three principal problems. The first is the requirement to generate creep torque without any feeling of delay in response to the driver's demand when the brake pedal is released. The second is to absorb the torque shock that occurs immediately after the engine resumes firing. The third is the requirement to provide acceleration performance without giving the driver any unnatural feeling, if the accelerator is depressed immediately after the engine restart. With an automatic transmission or a CVT, it is necessary to start the engine and generate creep torque without any sensation of delay (first issue). After the engine is started by the motor, the intake manifold pressure is near atmospheric air pressure and large engine torque is produced once the engine begins firing again. Moreover, if the driver depresses the accelerator during this interval, the vehicle must accelerate in response to the driver's demand (second and third issues). The objective of this research was to resolve these three issues with just one motor so as to provide fully natural acceleration performance from a non-idling state with the engine turned off while the vehicle is at rest. This paper describes the measures examined to solve these issues, thereby enabling the vehicle to provide start-off and acceleration performance that feels completely natural regardless of the driver's accelerator input after the engine is restarted. This report introduces a solution method for these issues. As a result, the vehicle can provide start-off and acceleration performance that feels completely natural regardless of the driver's accelerator input after the engine is restarted.
Non-idling system for a CVT-equipped car
Antriebssystem ohne Leerlauf für ein Fahrzeug mit stufenlosem Getriebe
1999
9 Seiten, 15 Bilder, 1 Tabelle, 2 Quellen
Aufsatz (Konferenz)
Englisch