Drive force control device

Details Drive force control device Drive force control device

2000-05-17

2001-12-11

Marmor, Charles A (Department: 3681)

Interrelated power delivery controls, including engine control

Transmission control

Continuously variable friction transmission

C477S003000, C477S015000, C180S065510

Reexamination Certificate

active

06328671

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to a drive torque control of a so-called parallel hybrid vehicle which transmits the power of an engine and a motor/generator to drive wheels via a continuously variable transmission.
BACKGROUND OF THE INVENTION
Tokkai Hei 8-251708 published by the Japanese Patent Office in 1996 discloses a parallel hybrid drive system for a vehicle wherein an engine and motor/generator are connected to drive wheels via a V-belt continuously variable transmission.
A motor/generator is a device equipped with the functions of both a motor and a generator so that a rotor is rotated according to the energizing of the coil of a stator, and the coil of the stator generates a current according to the rotation input to the rotor.
Tokkai Sho 62-110536 published by the Japanese Patent Office in 1987 discloses a drive force controller for a vehicle equipped with an electronic throttle and a continuously variable transmission. A target vehicle drive torque is calculated based on the depression amount of an accelerator pedal and the vehicle speed, and a target rotation speed of the input shaft of the continuously variable transmission is calculated from the target vehicle drive torque and vehicle speed, and a target speed ratio of the continuously variable transmission is set to achieve the target rotation speed. Also, a target engine torque is calculated from the target speed ratio and target vehicle drive torque. The speed ratio of the continuously variable transmission is controlled to the target speed ratio, and the degree of opening of the electronic throttle is controlled to obtain the target engine torque. The torque required by a driver is thereby obtained.
SUMMARY OF THE INVENTION
In the above-mentioned hybrid drive system, the proportion of the output torque of the engine and motor/generator varies depending on the running state. For this reason, the above-mentioned drive force controller is not applicable to the hybrid drive system.
It is therefore an object of this invention to correctly control the drive force of a parallel hybrid vehicle which transmits the drive torque of the engine and motor/generator to the drive wheels via the continuously variable transmission.
In order to achieve the above object, this invention provides a drive force control device for such a hybrid vehicle that has an engine which is controlled to reach a target engine torque (t
TE
), a motor/generator which is controlled to reach a target motor/generator torque (t
TMG
) and which is connected to a battery, and a continuously variable transmission which is controlled to reach a target speed ratio (t
RI/O
) and which is connected to the engine and the motor/generator.
The device comprises 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, and a microprocessor.
The microprocessor is programmed to set a target drive power (t
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
PE
) based on the target drive power (t
PO
) and the battery power (PB), set a limited target engine power (t
PELMT
) to zero when the target engine power (t
PE
) is less than a predetermined value, and set the limited target engine power (t
PELMT
) equal to the target engine power (t
PE
) when the target engine power (t
PE
) is larger than the predetermined value, set the target engine torque (t
TE
) and a target engine rotation speed (t
NE
) based on the limited target engine power (t
PELMT
), set the target motor/generator torque (t
TMG
) based on a target motor/generator power (t
PMG
) and the input rotation speed (NI), and set the target speed ratio (t
RI/O
) based on the target engine rotation speed (NI) and the vehicle speed (VSP).
The details as well as other features and advantages of this invention are set forth in the remainder of the specification and are shown in the accompanying drawings.


REFERENCES:
patent: 5789881 (1998-08-01), Egami et al.
patent: 5846155 (1998-12-01), Taniguchi et al.
patent: 5873426 (1999-02-01), Tabata et al.
patent: 5939848 (1999-08-01), Yano et al.
patent: 5959420 (1999-09-01), Boberg et al.
patent: 6166499 (2000-12-01), Kanamori et al.
patent: 3338548 (1985-05-01), None
patent: 4124479 (1993-01-01), None
patent: 410448 (1991-01-01), None
patent: 743208 (1996-11-01), None
patent: 0 781 680 (1997-07-01), None
patent: 0 788 914 (1997-08-01), None
patent: 62-110536 (1987-05-01), None
patent: 8-251708 (1996-09-01), None

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