摘要:
To enhance the reliability of a brake system with electronic control of the brake force distribution, a short pressure reduction pulse, which is negligible for the braking process, is applied to the front wheels (VR, VL) during a braking operation, and the reaction of the front wheels to the pressure reduction pulse is sensed. If imbalance of the front-wheel brakes or a defect is concluded from the reaction, the limitation of the pressure rise in the wheel brakes of the rear wheels (HR, HL), which is an effect of the brake force distribution control, is minimized or eliminated. Thus, the rear wheels provide an increased contribution to the braking process in this situation.
摘要:
A circuit configuration for an anti-lock brake system, including a master cylinder (1) with a travel switch (27, 27') and an electromotively (31, 31') driven hydraulic pump (32, 32'), disposes of a "pump control" (45) which switches on the drive motor (31, 31') of the hydraulic pump (32, 32') in dependence on the vehicle deceleration and on the pressure fluid requirement during an anti-lock controlled braking operation, or on corresponding criteria and test results.
摘要:
For controlling a traction slip control system with brake and motor management, motor regulating signals (m) are derived from electrical signals indicative of the brake pressure or which influence the brake pressure. Preferably, a brake pressure pattern (p[t]) is formed taking into account the pressure build-up and pressure decrease characterics of the wheel brakes or of the entire system as a basis for computing the motor regulating signals (m).
摘要:
A circuit configuration for a brake system including an anti-locking control system, wherein a balanced pressure course is attained in the rear wheel brakes through control according to the "select-low" principle. The circuit configuration is furnished with a supplemental circuit (8) comparing the rotating pattern of the rear wheels during the control and, upon detection of a brake moment difference (.DELTA.M) causes a brake moment correction. This correction can be achieved, for example, by prolongating (T.sub.p, T'.sub.p) of the pressure build-up pulses controlling the rise in pressure in the wheel exhibiting a lower brake moment.
摘要:
A method for controlling an anti-lock brake system for automotive vehicles with all-wheel drive. Electric signals representative of the rotational behavior of the wheels are generated and logically combined. Upon the occurrence of a tendency to lock, the braking pressure is modulated wherein the instantaneous wheel slip, wheel acceleration and wheel deceleration are evaluated as control criteria and the individual wheel speed (v.sub.R) is compared in each case with a vehicle reference speed (v.sub.REF) which serves as a reference value for the modulation of braking pressure. In the event of a wheel rotational behavior that is typical of spinning and that shows in the rise of the vehicle reference speed (v.sub.REF) in excess of the actual vehicle speed (v.sub.FZG), the control concept is modified until a specific point of time by deleting the instantaneous wheel slip as a control criterion for this phase of spinning and by the brake slip control becoming dependent on solely wheel acceleration or wheel deceleration.
摘要:
A system and method for operating a hydraulic braking system) for motor vehicles with an electrically controllable pressure provision device), a high-pressure accumulator, which can be connected to the pressure provision device via a hydraulic connection), in which an electrically controllable shutoff valve is arranged, wheel brakes, which can be supplied with pressure medium by means of the pressure provision device and/or the high-pressure accumulator. An electronic control and regulating unit is provided for actuating the electrically controllable pressure provision device and/or the electrically controllable shutoff valve so as to regulate the hydraulic pressure which is provided by the pressure provision device and the high-pressure accumulator If a pressure buildup is carried out by activation of the pressure provision device, the high-pressure accumulator is connected only temporarily by at least partial opening of the shutoff valve.
摘要:
Method for monitoring an electrohydraulic braking system. The volume uptake is determined by the elasticity within the wheel brake that is subjected to certain fluctuations, on the one hand, and to a much greater degree by the clearance that is present, on the other hand. To make a reliable statement relating to the air charge, an estimation of the current clearance is first made, taking three ranges into consideration. If there is a normal clearance, a top evaluation threshold is taken as a basis, which assumes the clearance lies at the upper end of the normal range. When said evaluation threshold is exceeded, an alarm is triggered. If the clearance is assumed to lie at the bottom limit of the normal range, a bottom evaluation threshold applies, however, an alarm is only triggered in this case this situation has occurred several times in succession.
摘要:
To improve the control behavior of an ABS system in an off-road travel situation, a special control mode is activated as soon as such an off-road travel situation is identified. To this end, braking pressure reduction on the wheel of a vehicle axle which is the first to exceed the normal control thresholds is prevented, different from the normal control mode, and the braking pressure on this wheel is maintained constant until reacceleration of this wheel commences. Starting from this time, braking pressure increase is allowed in the wheel brake of this wheel until the normal control thresholds are reached and the special control mode is terminated. The normal control mode applies to the second wheel of the axle concerned as long as the special control mode applies to the first wheel. Subsequently, the special control mode can pass on to the second wheel of the axle, and the first wheel will then ensure that steerability and/or driving stability is maintained.
摘要:
The present invention discloses a method for use in automotive vehicles with an electronically controlled brake system (for example, ABS), wherein for controlling the braking pressure (re)increase during a control operation the rotational behavior of the individual wheels is measured and evaluated to determine braking pressure control signals, and wherein during a braking pressure control operation the braking pressure reduction in the previous cycle (26) is taken into account for the control of the braking pressure reincrease (27). According to the present invention, a braking pressure rise gradient (G) is calculated on the basis of the braking pressure increase in the preceding braking pressure increase phase (25), and the braking pressure increase or the variation of the braking pressure increase is calculated and predetermined on the basis of the rise gradient (G) and the calculated wheel cylinder pressure (P2) at the commencement of the current braking pressure increase phase (27) and on the basis of the current calculated locking pressure level (N3).
摘要:
To retain a vehicle on an inclined roadway and when starting uphill, the vehicle speed, the brake pedal application, the drive torque, the operating condition of the vehicle engine, the application of a parking brake, and the activation of the retaining system is determined. When the retaining system is activated and the vehicle speed lies below a limit value, the brake force or the braking pressure is maintained when the brake pedal is applied and no drive torque is sensed; the brake force is increased when the driving engine is switched off and neither the brake pedal nor the parking brake is activated, or when the engine is switched on and neither brake pedal application nor drive torque is sensed. The brake force is reduced when the parking brake is applied, with the engine switched off and the brake pedal not applied, or a drive torque is sensed with the engine switched on. The retaining system is deactivated when the vehicle speed threshold is exceeded and/or when the off-switch is activated.A warning signal can be triggered by a door contact and/or a seat contact.