Drive force distribution apparatus for hybrid vehicle
First Claim
1. A drive force distribution apparatus for a hybrid vehicle having an engine for driving a pair of first drive wheels and an electric motor for driving a pair of second drive wheels, comprising:
- a first clutch interposed between said electric motor and one of said second drive wheels;
a second clutch interposed between said electric motor and the other of said second drive wheels;
a battery for supplying electric energy to said electric motor and storing electric energy regenerated by said electric motor;
a vehicle speed sensor for detecting a vehicle speed;
an accelerator opening sensor for detecting an accelerator opening;
a brake depression force sensor for detecting a brake depression force;
a steering angle sensor for detecting a steering angle of a steering wheel;
a yaw rate sensor for detecting a yaw rate;
first means for deciding the distribution between a drive force for driving said first drive wheels and a drive force for driving said second drive wheels according to said vehicle speed detected, said accelerator opening detected, said brake depression force detected, a state of said battery, and a weight distribution of said vehicle;
second means for deciding the distribution between a drive force for driving one of said second drive wheels and a drive force for driving the other of said second drive wheels according to said vehicle speed detected, said steering angle detected, and said yaw rate detected; and
clutch control means for controlling a degree of engagement of each of said first and second clutches according to the distribution decided by said second means.
1 Assignment
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Accused Products
Abstract
A drive force distribution apparatus for a hybrid vehicle having an engine for driving a pair of first drive wheels and an electric motor for driving a pair of second drive wheels. The drive force distribution apparatus includes a first clutch, a second clutch, and a battery. The apparatus further includes a first unit for deciding the distribution between a drive for driving the first drive wheels and a drive force for driving the second drive wheels, a second unit for deciding the distribution between a drive force for driving one of the second drive wheels and a drive force for driving the other of the second drive wheels according to a detected vehicle speed, steering angle, and yaw rate, and a clutch control unit for controlling a degree of engagement of each of the first and second clutches according to the distribution decided by the second unit.
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Citations
4 Claims
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1. A drive force distribution apparatus for a hybrid vehicle having an engine for driving a pair of first drive wheels and an electric motor for driving a pair of second drive wheels, comprising:
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a first clutch interposed between said electric motor and one of said second drive wheels;
a second clutch interposed between said electric motor and the other of said second drive wheels;
a battery for supplying electric energy to said electric motor and storing electric energy regenerated by said electric motor;
a vehicle speed sensor for detecting a vehicle speed;
an accelerator opening sensor for detecting an accelerator opening;
a brake depression force sensor for detecting a brake depression force;
a steering angle sensor for detecting a steering angle of a steering wheel;
a yaw rate sensor for detecting a yaw rate;
first means for deciding the distribution between a drive force for driving said first drive wheels and a drive force for driving said second drive wheels according to said vehicle speed detected, said accelerator opening detected, said brake depression force detected, a state of said battery, and a weight distribution of said vehicle;
second means for deciding the distribution between a drive force for driving one of said second drive wheels and a drive force for driving the other of said second drive wheels according to said vehicle speed detected, said steering angle detected, and said yaw rate detected; and
clutch control means for controlling a degree of engagement of each of said first and second clutches according to the distribution decided by said second means. - View Dependent Claims (2, 3, 4)
means for deciding a calculated lateral G from said vehicle speed and said steering angle;
means for deciding a lateral distribution coefficient KLR from said calculated lateral G and said vehicle speed;
means for calculating a steering angle yaw rate and a lateral G yaw rate;
means for calculating a corrected torque value KTQ according to said steering angle yaw rate calculated and said lateral G yaw rate calculated; and
means for calculating the drive forces for driving said second drive wheels according to said lateral distribution coefficient KLR and said corrected torque value KTQ.
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3. A drive force distribution apparatus according to claim 2, wherein when the sign of said drive force calculated on one of said second drive wheels is different from the sign of said drive force calculated on the other of said second drive wheels, either of said drive forces is set to 0.
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4. A drive force distribution apparatus according to claim 1, further comprising:
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a G sensor for detecting a lateral G;
said second means deciding the distribution between said drive forces for driving said second drive wheels according to said vehicle speed detected, said steering angle detected, said yaw rate detected, and said lateral G detected.
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Specification