Patent Number: 6,253,127

Title: Engine startup control device and control method

Abstract: A hybrid vehicle is provided with an engine (2), a first motor (1) for starting the engine (2), a generator (1) for driving the engine (2), drive wheels (8) connected to the engine (2) via a clutch (3), and a second motor (4) for driving the drive wheels (8). A battery (15) connected to the first motor (1), second motor (4) and generator (1) is further provided. A control device which controls the engine startup by the first motor (1) comprises a sensor (27) which detects a rotation speed of the engine (2), a sensor (26) which detects the charge amount of the battery (15), a power controller (11) which varies the current supplied to the first motor (1) from the battery (15) according to a signal, and a microprocessor (16) which outputs the signal. The microprocessor (16) calculates a target output torque of the first motor (1) according to the charge amount of the battery (15). When the rotation speed of the engine (2) is less than a predetermined target rotation speed, the signal is set so that the output torque of the first motor (1) coincides with a predetermined output torque, and after the rotation speed of the engine (2) reaches the predetermined target rotation speed, the signal is set so that the rotation speed of the engine (2) is maintained at the predetermined target rotation speed.

Inventors: Itoyama; Hiroyuki (Yokohama, JP), Kitajima; Yasuhiko (Kamakura, JP), Deguchi; Yoshitaka (Yokohama, JP)

Assignee: Nissan Motor Co., Ltd.

International Classification: B60K 6/04 (20060101); B60K 6/00 (20060101); B60L 11/12 (20060101); B60L 11/02 (20060101); F02N 11/08 (20060101); G06F 017/00 ()

Expiration Date: 06/26/2018