摘要:
Disclosed herein are stability display apparatus and methods. One apparatus comprises a driving state detection unit configured to detect a driving state of a vehicle in operation; a controller comprising an instability estimation unit configured to estimate an instability index indicating driving instability of the vehicle based on the driving state of the vehicle detected by the driving state detection unit and configured to determine changes in the instability index; and a display unit configured to display the instability index estimated by the instability estimation unit in a display region within a range less than or equal to an upper limit that is a limit of display and configured to display in the display region a representation of the changes of the instability index when the instability index is beyond the upper limit.
摘要:
A vehicle behavior control system comprises a controller for determining a sensed steering angle from a steering amount signal and a neutral detection signal from a steering angle sensor, and performs a behavior control operation to reduce a deviation of a sensed actual motion variable such as a vehicle yaw rate from a target motion variable determined from the sensed steering angle. When the neutral detection signal is not available just after a start of the engine, the controller determines the target motion variable from an estimated steering angle instead of the sensed steering angle, and immediately starts controlling the vehicle behavior without delay by, for example, controlling the braking forces of the individual wheels.
摘要:
A system and method for independently controlling the braking force applied to each wheel of an automobile based on the lesser of two target braking force calculations intended to produce a desired vehicular motion. The first target braking force is based upon steering angle and vehicle sped, and is calculated so as to achieve a target value of a preselected motion variable, such as yaw rate, corresponding to the desired vehicular motion. The second target braking force is based upon individual wheel speed and is intended to maintain within a predetermined slip rate at least one wheel of the vehicle.
摘要:
A vehicle dynamic characteristic is controlled using a first unit for controlling braking forces to be applied to left and right wheels of at least one of the wheel pairs, a second unit for controlling a steering angle of one of the wheel pairs, and a third unit for controlling the first and second units. In the absence of vehicle braking, the third unit calculates a first target value for a first parameter related to a first motion of the vehicle based upon vehicle operating conditions and controls the second unit to bring the first parameter to the first target value. The third unit calculates a value of a second parameter related to a second motion of the vehicle provided when the first parameter is controlled to the first target value in the absence of vehicle braking. In the presence of vehicle braking, the third unit calculates changes in cornering powers of the respective wheel pairs and modifies the first target value based upon the calculated cornering power changes. The third unit controls the second unit to bring the first parameter to the modified first target value and controls the first unit to bring the second parameter to the calculated value.
摘要:
A braking force control apparatus for use with an automotive vehicle. The braking forces applied to the left and right wheels of the vehicle are controlled to provide a target yaw rate calculated based upon a sensed steering angle and a sensed vehicle speed. For this control, a target difference between the braking forces applied to the left and right wheels is calculated from a vehicle model specifying a target braking force difference as a function or functions of target yaw rate, steering angle and vehicle speed. The vehicle model is obtained from equations of motions of the vehicle. The calculated braking force difference is used to set the braking forces to be applied to the left and right wheels.
摘要:
A control system for a wheeled vehicle, comprises a brake actuator for controlling a behavior of the vehicle during braking by producing a braking force difference between a left wheel braking force and a right wheel braking force in response to a control signal, a sensor for sensing an actual vehicle motion variable such as a yaw rate, and a controller for controlling the vehicle motion by producing the control signal. The controller determines an estimated vehicle motion variable from a driver's steering command by using one or more predetermined estimator transfer characteristics, compares the sensed and estimated vehicle motion variables to determine a deviation therebetween, and determines the magnitude of the control signal so as to reduce the deviation by using a predetermined compensator transfer characteristic and a predetermined filter transfer characteristic for filtering the deviation.
摘要:
Automotive brake control is performed by controlling brake pressure at front and rear wheels independently. The braking force at each of the front and rear wheels is controlled in accordance with monitored vehicle driving conditions so that the steering characteristics of the vehicle are held to predetermined characteristics even when vehicular brakes are applied during cornering. The braking pressure at front wheels is decreased when understeer characteristics increases due to braking. On the other hand, the braking pressure at the rear wheel is decreased when oversteer characteristics increases due to braking.
摘要:
An anti-skid brake control system for an automotive vehicle, is able to achieve both of satisfactory braking characteristics and cornering stability. The anti-skid brake control system is variable of wheel slippage criteria depending upon a magnitude of transverse force exerts on the vehicle for achieving both of the desired level of braking performance and sufficient cornering stability for suppressing undesirable vehicle behavior in transverse direction. Therefore, the an anti-skid brake control system, according to the present invention, controls application and release of an automotive brake system by comparing wheel speed with a wheel slippage criteria. The system is also detective of transverse force exerting on the vehicle body for varying the wheel slippage criteria so that wheel slippage criteria is set in a level assuring sufficient level of cornering force against the transverse force for satisfactory level of the cornering stability of the vehicle.
摘要:
A vehicle steering control system is provided with a steering angle ratio varying mechanism, a variable power assisted steering mechanism and a steering angle ratio controller. The steering angle ratio varying mechanism varies the steering angle ratio, which is the ratio of the turning angle of the front wheels with respect to the steering angle of the steering wheel. The variable power assisted steering mechanism outputs an auxiliary steering force that supplements the steering force of the driver to the steering mechanism for turning the front wheels. The steering angle ratio controller increases the steering angle ratio in a steering angle range in the vicinity of the steering angle center point, and reduces the steering angle ratio in the steering angle range in the vicinity of the rack stopper position, regardless of the steering angular speed of the steering wheel.
摘要:
A vehicle dynamic characteristic control apparatus for use with an automotive vehicle supported on a pair of front wheels and a pair of rear wheels. The apparatus comprises a first unit for controlling a steering angle of one of the wheel pairs, a second unit for controlling braking forces to be applied to left and right wheels of at least one of the wheel pairs, and a third unit coupled to the sensor means for controlling the first and second units. The third unit calculates a target value for a dynamic parameter related to a motion of the vehicle based upon the sensed vehicle operating conditions. The third unit controls the first unit to bring the dynamic parameter to the target value. In the presence of vehicle braking, the third unit calculates changes in cornering powers of the respective wheel pairs and controls the second unit to provide a difference between the braking force applied to the left wheel and the braking force applied to the right wheel so as to cancel an influence of the cornering power changes on the dynamic parameter.