Vehicle and method for controlling vehicle
First Claim
1. A system for controlling a vehicle, comprising:
- a front wheel drive device that drives front wheels, a rear wheel drive device that drives rear wheels separately and independently from the front wheel drive device, and a drive state control device that controls the front wheel drive device and the rear wheel drive device to control a drive state of the front wheels and the rear wheels;
wherein the drive state control device performs a first switch to switch between a front wheel independent drive state that drives only the front wheels and a combined drive state that drives both the front wheels and the rear wheels, and a second switch to switch between a rear wheel independent drive state that drives only the rear wheels and the combined drive state; and
furthermore wherein;
the drive state control device prohibits the first switch and the second switch when a lateral acceleration related value related to a lateral acceleration acting on the vehicle exceeds a first threshold value; and
the drive state control device sets the first threshold value as a reference for a divergence reference value for whichever value of a first lateral acceleration related value and a second lateral acceleration related value is smaller, when a first correlation is defined as a correlation between the lateral acceleration related value and a turning characteristic related value in the front wheel independent drive state, a second correlation is defined as a correlation between the lateral acceleration related value and the turning characteristic related value in the rear wheel independent drive state, a third correlation is defined as a correlation between the lateral acceleration related value and the turning characteristic related value in the combined drive state, while at the same time, the first lateral acceleration related value is defined as the lateral acceleration related value when the turning characteristic related value in the first correlation and the turning characteristic related value in the third correlation diverge by a first predetermined value or greater, and the second lateral acceleration related value is defined as the lateral acceleration related value when the turning characteristic related value in the second correlation and the turning characteristic related value in the third correlation diverge by a second predetermined value or greater.
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Accused Products
Abstract
A vehicle in which a drive state can be favorably selected in a configuration that separately and independently drives front and rear wheels and a method for controlling the vehicle. In the vehicle and control method thereof, a drive state control device prohibits operation of a first switch between front wheel drive (FWD) and all wheel drive (AWD) and a second switch between rear wheel drive (RWD) and AWD when a lateral acceleration related value of the vehicle exceeds a first threshold value G1. The first threshold value G1 is set with a divergence reference value Gref as a reference. The Gref value is determined considering factors such as lateral acceleration, turning characteristics and the drive state of the vehicle.
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Citations
19 Claims
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1. A system for controlling a vehicle, comprising:
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a front wheel drive device that drives front wheels, a rear wheel drive device that drives rear wheels separately and independently from the front wheel drive device, and a drive state control device that controls the front wheel drive device and the rear wheel drive device to control a drive state of the front wheels and the rear wheels; wherein the drive state control device performs a first switch to switch between a front wheel independent drive state that drives only the front wheels and a combined drive state that drives both the front wheels and the rear wheels, and a second switch to switch between a rear wheel independent drive state that drives only the rear wheels and the combined drive state; and
furthermore wherein;the drive state control device prohibits the first switch and the second switch when a lateral acceleration related value related to a lateral acceleration acting on the vehicle exceeds a first threshold value; and the drive state control device sets the first threshold value as a reference for a divergence reference value for whichever value of a first lateral acceleration related value and a second lateral acceleration related value is smaller, when a first correlation is defined as a correlation between the lateral acceleration related value and a turning characteristic related value in the front wheel independent drive state, a second correlation is defined as a correlation between the lateral acceleration related value and the turning characteristic related value in the rear wheel independent drive state, a third correlation is defined as a correlation between the lateral acceleration related value and the turning characteristic related value in the combined drive state, while at the same time, the first lateral acceleration related value is defined as the lateral acceleration related value when the turning characteristic related value in the first correlation and the turning characteristic related value in the third correlation diverge by a first predetermined value or greater, and the second lateral acceleration related value is defined as the lateral acceleration related value when the turning characteristic related value in the second correlation and the turning characteristic related value in the third correlation diverge by a second predetermined value or greater. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for controlling a vehicle, comprising:
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a front wheel drive device that drives front wheels, a rear wheel drive device that drives rear wheels separately and independently from the front wheel drive device, and a drive state control device that controls the front wheel drive device and the rear wheel drive device to control a drive state of the front wheels and the rear wheels; wherein the drive state control device performs a first switch to switch between a front wheel independent drive state that drives only the front wheels and a combined drive state that drives both the front wheels and the rear wheels, and a second switch to switch between a rear wheel independent drive state that drives only the rear wheels and the combined drive state, and furthermore wherein; the drive state control device prohibits the first switch and the second switch when a lateral acceleration related value related to as lateral acceleration, acting on the vehicle exceeds a first threshold value; and wherein the first threshold value is determined considering the lateral acceleration acting on the vehicle, a turning characteristic related value, and the drive state of the front wheels and the rear wheels. - View Dependent Claims (11, 12, 13, 14)
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15. A method for controlling a vehicle, the vehicle including as front wheel, drive device that drives front wheels, a rear wheel drive device that drives rear wheels separately and independently from the front wheel drive device, and a drive state control device that controls the front wheel drive device and the rear wheel drive device to control a drive state of the front wheels and the rear wheels between a front wheel independent drive state that drives only the front wheels, a rear wheel independent drive state that drives only the rear wheels and a combined drive state that drives both the front wheels and the rear wheels;
- the method comprising;
allowing the drive state control device to switch between the front wheel independent drive state, the rear wheel independent drive state and the combined drive state; prohibiting the drive state control device from switching the drive state when a lateral acceleration related value exceeds a first threshold; and setting the first threshold based on a lateral acceleration acting on the vehicle, a turning characteristic related value, and the drive state of the front wheels and the rear wheels. - View Dependent Claims (16, 17, 18, 19)
- the method comprising;
Specification