Patent ID: 6328671
Filing Date: 2001-12-11
Classification: B60K,B60L,B60W,F16H,Y02T,Y10S,Y10T

Abstract:
A drive force control device for hybrid vehicle having an engine which is controlled to reach a target engine torque (t.sub.TE), a motor/generator which is controlled to reach a target motor/generator torque (t.sub.TMG) and which is connected to a battery, and a continuously variable transmission which is controlled to reach a target speed ratio (t.sub.RI/O) and which is connected to the engine and the motor/generator, comprising:a sensor for detecting a depression amount (APO) of an accelerator pedal;a sensor for detecting a vehicle speed (VSP);a sensor for detecting an input rotation speed (NI) of the continuously variable transmission;a sensor for detecting a battery charge amount (SOC) of the battery; anda microprocessor programmed to:set a target drive power (t.sub.PO) based on the depression amount of the accelerator pedal (APO) and the vehicle speed (VSP);set a battery power (PB) based on the battery charge amount (SOC);set a target engine power (t.sub.PE) based on the target drive power (t.sub.PO) and the battery power (PB);set a limited target engine power (t.sub.PELMT) to zero when the target engine power (t.sub.PE) is less than a predetermined value, and set the limited target engine power (t.sub.PELMT) equal to the target engine power (t.sub.PE) when the target engine power (t.sub.PE) is larger than the predetermined value;set the target engine torque (t.sub.TE) and a target engine rotation speed (t.sub.NE) based on the limited target engine power (t.sub.PELMT);set the target motor/generator torque (t.sub.TMG) based on a target motor/generator power (t.sub.PMG) and the input rotation speed (NI); andset the target speed ratio (t.sub.RI/O) based on the target engine rotation speed (NI and the vehicle speed (VSP).