摘要:
Method and device for calculating chassis height of a vehicle that has at least three air-suspended wheel axles (2, 3, 4). The device includes a control unit and two level sensors (9, 10). The control unit detects the chassis height at the front axle (2) via a first level sensor (9) and at the forward rear axle (3) via a second level sensor (10), and the control unit calculates the chassis height at the rearmost wheel axle (4). An object of the disclosure is to protect the rear axle installation with as few level sensors as possible.
摘要:
A method and system for controlling a vehicle suspension system switchable between two modes of operation, including a first mode for when the vehicle is experiencing an on-road driving condition and a second mode for when the vehicle is experiencing an off-road driving condition, includes a vehicle speed sensor for sensing a speed of the vehicle and generating a vehicle speed signal, which may be an inherent part of the vehicle required for other vehicle functions, such as ABS, speed, or other control. The system also includes a controller for detecting an off-road driving condition and comparing the vehicle speed signal to a predetermined speed threshold. The controller then controls the suspension system to switch to the second mode of operation upon detecting the off-road driving condition and the vehicle speed signal being less than the predetermined speed threshold.
摘要:
A height-adjusting system includes a rough road detecting means for detecting whether a vehicle is being driven on a rough road. When, in a condition where there has been no substantial variation in a load on a vehicle, a variation of vehicle information that varies while the vehicle is being driven, exceeds a threshold value, the rough road detecting means detects that a rough road condition is satisfied.
摘要:
An adaptive active suspension system for a wheeled vehicle in which a powered actuator supplies a force between an unsprung wheel assembly and the vehicle body. The actuator is controlled by a signal from a feedback control system whose dynamic properties are determined by control gain values stored in a memory. The stored control gain values are calculated to simultaneously reduce vehicle body acceleration, tire deflection and suspension displacement (stroke). A road profile estimator provides an indication of predicted road roughness and, as road roughness varies, the effective stiffness of the suspension system is adaptively altered while maintaining a substantially constant ratio between tire deflection and suspension stroke. To reduce the computational burden on the system, the control gains are pre-computed for a range of varying road conditions and stored in memory. The current control gains in effect may be updated on a substantially continuous basis or, to further reduce the amount of computing required, may be altered only when the current estimate of road roughness departs from a predetermined range of values.
摘要:
A method and apparatus for dynamically leveling the attitude of a vehicle using a low power fully active suspension system. The suspension system includes a hydraulic actuator operably connected at each corner of the vehicle between sprung and unsprung portions thereof, sensors for detecting movement of the sprung and unsprung portions of the motor vehicle and for deriving a force signal for each actuator in response thereto, and a valving arrangement for causing the hydraulic actuator to generate a desired output force in response to the force signal. The valving arrangement has a first valving that is operable for generating the output force by selectively varying the damping characteristics of the hydraulic actuator when the force signal is within a predetermined range. The valving arrangement also includes second valving for selectively controlling the supply and discharge of hydraulic fluid between the hydraulic actuator and a fluid pressure source for generating the output force when the force signal is outside of the predetermined range. Thus, the lower power fully active suspension system is adapted to produce the desired output force through selective actuation of the first and second valvings for limiting the duty cycle and power requirements of the fluid pressure source.
摘要:
An actively controlled suspension system comprises a hydraulic cylinder disposed between a vehicle body and a suspension member rotatably supporting a vehicular wheel, the hydraulic cylinder defining therein a working chamber, a pressure source including a pump associated with an automotive internal combustion engine to be driven by the output of the engine, a pressure control valve having a first port connected to the working chamber, a second port connected to the pressure source via a supply line and a third port connected to the pressure source via a drain line, the pressure control valve being variable of valve position for selectively establishing and blocking fluid communication between the first port and the second port and between the first port and the third port for adjusting fluid pressure in the working chamber for controlling suspension characteristics, a vertical acceleration sensor for monitoring vertical acceleration exerted on the vehicular body to produce a vertical acceleration indicative signal, first circuit for arithmetically deriving a vertical stroke speed of the vehicular body on the basis of the vertical acceleration indicative signal, second circuit for detecting initiation of arithmetic operation of the first circuit for setting data for use in derivation of the vertical speed in a value for cancelling offset contained in the vertical acceleration indicative signal.
摘要:
A suspension pressure control system applies a pressure which is proportional to a current level supplied to a solenoid of a pressure control valve to a shock absorber associated with a suspension from the valve. When a pressure in a high pressure line which feeds a high pressure to the pressure control valve falls (rises), the pressure applied to the suspension is decreased (increased). Accordingly, the pressure in the high pressure line is detected by a sensor, and if it is low (high), the current level of the pressure control valve is corrected to a high value (low value). In order to prevent an abnormal pressure rise in the suspension which may be caused by an excessive pressure rise in the high pressure line during an idling operation of an engine, a correction which responds to the pressure of the high pressure line is chosen large when a vehicle speed is equal to zero or very low. In order to prevent an abnormality from occurring in the correction of the pressure which is attributable to an errorneous detected value during a failure of operation of sensor, such detected value is determined to be faulty, and in the event a fault occurred, the correction is modified to a given volume (0) which is allocated to a standard pressure in the high pressure line.
摘要:
In a system for controlling the US-OS characteristic of a vehicle having front and rear suspensions, a device for changing the US-OS characteristic is provided which is adapted to alter the roll stiffness distribution between the front and the rear suspensions. A turning state quantity is detected and the changing rate of a turning state quantity is determined. A control device is further provided which is adapted to respond to the turning state quantity and the changing rate of the turning state quantity, and to control the US-OS characteristic changing device so that the higher the changing rate of the turning state quantity is, the more the US-OS characteristic may be shifted toward higher over-steer, and for the same changing rate the higher the turning state quantity is, the more the US-OS characteristic may be shifted toward higher under-steer.
摘要:
Deflection detection pick-ups are arranged at the wheels or wheel suspensions of the vehicle, from the signals of which pick-ups a computer determines an averaged pitch angle. These averaged actual values are compared with predetermined or predeterminable set values. the correction of the supporting forces of the support assemblies effected thereupon by the computer is dependent on the extent to which the vehicle body has to execute pure lifting movements, pure rolling movements and/or pure pitching movements to approximate the actual values to the set values and in which proportions the forces necessary for the damping of rolling or pitching movements are to be applied by the support assemblies of the front or rear wheels. In this case, the forces serving for the compensation of rolling movements can be distributed over the front and rear wheels in such a way that a desired control tendency of the vehicle, in particular a tendency toward under-controlling, is obtained.
摘要:
A control system for an adjustable automotive vehicle suspension unit calculates the instantaneous angular rate of a steering handwheel associated with the vehicle and compares the calculated rate with an initiation value. If the calculated angular rate exceeds the initiation value, the excursion angle of the steering handwheel will be measured during a predetermined time period and in the event that such excursion angle exceeds a critical value during the time period or a threshold value at the conclusion of the time period, the adjustable suspension unit will be adjusted accordingly.