Abstract:
A drive force distribution control apparatus in which if a relay output voltage (Vah) detected by relay-output-voltage detecting means (30) is lower than a first threshold, the relay is repeatedly and successively turned on and off multiple times, and then if the relay output voltage (Vah) detected later by the relay-output-voltage detecting means (30) while an engine speed (Er) is higher than a second threshold and an ignition switch (IG) is on is still lower than the first threshold, it is determined that there is an abnormality that keeps the relay stuck open, and then control for switching the drive mode from a four-wheel-drive mode to a two-wheel-drive mode is executed.
Abstract:
An on-demand-type drive state control apparatus for a vehicle is provided. In the case where acceleration slippage occurs at drive wheels (rear wheels) of a vehicle when a drive system is in a two-wheel drive state, the drive system is switched from the two-wheel drive state to a four-wheel drive state. That is, the maximum transmittable torque of a multi-disc clutch mechanism increases from “0” to a predetermined value. In the four-wheel drive state, the maximum transmittable torque decreases stepwise from the present value by a predetermined value every time the vehicle travels over a predetermined distance in a state in which none of the wheels cause acceleration slippages. That is the clutch drive current supplied to the multi-disc clutch mechanism decreases gradually (stepwise or in a plurality of steps), and the drive torque distributed to the front wheels (rear wheels) decreases (increases) gradually.
Abstract:
The invention provides a traction control device capable of preventing a reduction in acceleration. A fraction control device of the invention includes a braking mechanism controller that controls a braking mechanism. The braking mechanism controller includes: a target brake torque calculating section that calculates a target brake torque to each of wheels based on the rotation speed of the wheel and an estimated vehicle speed; a target brake torque determining section that determines whether or not the target brake torque reaches or exceeds a per-stored threshold; a reference wheel determining section that selects a reference wheel used as a reference for controlling the braking mechanism based on the target brake torque to each of the wheels; and a target brake torque reducing section that reduces the target brake torque in accordance with a difference between the target brake torque to the reference wheel and the threshold when the target brake torque to one of the wheels reaches or exceeds the threshold.
Abstract:
In response to a driver's braking request operation, for example, the driver's depression of a brake pedal 85, a hybrid vehicle 20 sets a fraction of a regenerative braking torque by a motor MG2 and a fraction of a braking torque by a brake unit 90 relative to a preset braking torque demand Tr* according to the setting of a speed change ratio in a transmission 60 (steps S280, S290, S310, S320, S390, and S400). The hybrid vehicle 20 controls the motor MG2 to output the regenerative braking torque based on the preset braking torque demand Tr* and the set fraction of the regenerative braking torque, while controlling the brake unit 90 to enable the braking torque based on the preset braking force demand Tr* and the regenerative braking torque by the motor MG2 to be applied in a distributive manner at a preset front-rear braking torque distribution ratio ‘d’ to front wheels 39a and 39b and to rear wheels 39c and 39d.
Abstract:
A turning control apparatus for a vehicle to improve turning ability and to avoid degradation of acceleration ability is provided. The turning control apparatus comprises a first yaw controller for adjusting at least one of driving torque of a left wheel and a right wheel; a second yaw controller for adjusting a speeds difference between a front wheel and a rear wheel; and an integrated yaw controller for controlling yaw momentum of the vehicle by managing the first and second yaw controller, wherein when the yaw of the vehicle should be reduced, the integrated yaw controller controls the first yaw controller so as to decrease the driving torque of a inside wheel, which is one of the right and left wheel and is near to a center axis of turning, and the second yaw controller so as to decrease the speeds difference between the front and rear wheel.
Abstract:
An electronic traction optimization system includes a control unit adapted to produce a corner speed estimate signal for each wheel of a machine, produce an ideal target speed signal for each wheel having a value at least partially responsive to the corner speed estimate signals, produces a practical target speed signal for each wheel, generates an actual target speed signal having a value responsive to a comparison of the ideal target speed signal and the practical target speed signal for each wheel. The control unit compares each actual target speed signal to an associated wheel speed signal to obtain a wheel speed error signal for each wheel and converts each wheel speed error signal to a clutch control signal, wherein each differential clutch actuator is responsive to an associated clutch control signal.
Abstract:
A center-of-gravity-position lateral acceleration acquisition apparatus of the invention is applied to a vehicle equipped with a lateral acceleration sensor which is installed at a position remote from the center of gravity of the vehicle and which detects lateral acceleration of the vehicle at that position. The apparatus acquires lateral acceleration of the vehicle at the center of gravity of the vehicle by correcting the detected lateral acceleration by making use of two relationships; i.e., a first relationship which holds among yaw rate of the vehicle, the lateral acceleration of the vehicle at the center of gravity of the vehicle, and the detected lateral acceleration, and a second relationship which holds between the yaw rate of the vehicle and the lateral acceleration of the vehicle at the center of gravity of the vehicle during a predetermined stable travel.
Abstract:
In a braking/driving force control apparatus according to the present invention, a vehicle target braking/driving force Fvn and a vehicle target yaw moment Mvn through the control of braking/driving forces of wheels are calculated (Step 20), and when the target braking/driving force Fvn and the target yaw moment Mvn cannot be achieved through the control of the braking/driving forces of the wheels (Step 40), it is determined which one of the braking/driving force and the yaw moment should take priority on the basis of the target braking/driving force Fvn and the target yaw moment Mvn. When it is determined that the braking/driving force should take priority, the braking/driving forces of the wheels are controlled so as to attain the target braking/driving force Fvn as much as possible, and when it is determined that the yaw moment should take priority, the braking/driving forces of the wheels are controlled so as to attain the target yaw moment Mvn as much as possible (Steps 60 to 220).
Abstract:
A method of controlling an advanced chassis control system of a vehicle such as an anti-lock brake system, traction control system, vehicle stability control system, or roll control system affecting the vehicle dynamic performance and safety is disclosed. A control unit controls the operation of the advanced chassis control system based at least in part upon predictions of force generating characteristics of tires of the vehicle and driver input signals. The advanced chassis control system of the vehicle is controlled in one manner if the tire is determined to be inflated, controlled in another, different manner if the tire is determined to be deflated. During normal driving, the chassis control systems can operate to control the vehicle according to the desires of the driver while accounting for at least one tire being deflated. During braking the controller can act to distribute braking forces in order to divert forces from the deflated tire to the inflated tires.
Abstract:
A driver assistance system 1 includes at least driver assistance functions such as LDW (lane departure warning) and LKS (lane keeping support). The activation and deactivation of the driver assistance functions (LDW, LKS) are a function of a confidence level V.