Abstract:
A method for controlling the air pressure in tires able to be mounted on two powered axles of a motor vehicle, as a function of a driving situation, an engine torque being distributable to the two axles by a distributor clutch, and a plurality of input values being converted in a processing unit into an air pressure value describing the air pressure in each tire, a clutch friction value, which represents the clutch status, being processed into a control value in the processing unit as well. Also, a device which includes means for implementing such a method.
Abstract:
A traction control system having a braking intervention in particular for motor vehicles in which a slipping wheel is braked by a braking intervention on exceeding a slippage threshold. To improve the stability and steerability of the vehicle on slopes having different adhesive friction values between the right and left sides of the vehicle (&mgr;-split), the slippage threshold of the slipping low-&mgr; wheel is adjusted as a function of the slope, the slippage threshold of the slipping wheel being increased with an increase in slope in the case of a front-wheel drive vehicle and is decreased with an increase in slope in the case of a rear-wheel drive vehicle.
Abstract:
A device and method for determining values and/or generating signals, which can be used for closed-loop or open-loop controlling of the driving behavior of a vehicle equipped with a sensor system that detects wheel contact forces, includes determining the vehicle mass via the wheel contact forces that are detected, and further includes at least one of determining shifts in the wheel contact forces, and determining the required drive torque.
Abstract:
An arrangement for determining the temperature of valves in the brake circuit of a vehicle is described. The arrangement includes an arrangement to measure a longitudinal wheel force, an arrangement to determine a wheel braking pressure using the measured longitudinal wheel force, an arrangement to determine a pressure drop across a valve using the wheel braking pressure, an arrangement to determine a valve solenoid current using the pressure drop, an arrangement to determine the resistance of the valve solenoid from the valve solenoid current and an applied valve solenoid voltage, and an arrangement to determine the valve solenoid temperature using the temperature-dependence of the valve solenoid resistance. Moreover, a method for determining the temperature of valves in the brake circuit of a vehicle is provided.
Abstract:
A process and a device for controlling the brake system of a vehicle, in which in traction control and at the beginning of the control, a braking force build-up independent on the slippage takes place, which is stopped when a sizable braking effect is detected on the spinning wheel. Alternatively or in addition to this system, it is provided that, when the vehicle decelerates in active traction control, the braking force build-up pulses and/or the braking force decrease pulses are determined as a function of the measured slippage of at least one wheel, while outside these areas the pulses are determined so that the increase in braking force takes place in steps with the same change in the braking force.
Abstract:
In a method for monitoring the tire condition in a vehicle, the vertical acceleration is measured at one axle of the vehicle, a reference stiffness value is determined from the vertical acceleration, and a tire pressure is assigned to the reference stiffness value. In the case of a detected tire pressure loss, the tire pressure is assigned to the tire of the wheel having the pressure loss.
Abstract:
A method and device for monitoring the tire state at the driven wheels of a motor vehicle, in which angular motions of the driven wheels are measured and variables, which are a function of measured angular motions, are generated. The generated variables are combined with each other. The monitoring takes place as a function of the operation result. The drive torque acting on the driven wheels is taken into consideration in the monitoring. For different kinds of tires, the rolling circumference changes as a function of the drive torque in such a sharply varying manner, that a change in the rolling circumference caused by a loss of pressure may be offset and is not detected. If the effect of the drive torque is now considered in detecting a loss of tire pressure, then, even in such cases, the loss of pressure may be detected reliably and without detection errors.
Abstract:
In a brake system with a controllable hydraulic pump in a hydraulic circuit, and with at least one solenoid valve, the operating state of the valve is changed in response to a control signal. As a result of the change in the operating state of the solenoid valve, the flow resistance in the hydraulic circuit is changed. Monitoring structure is provided which, in the presence of certain operating conditions, monitor the run-down behavior of the hydraulic pump in different operating states of the solenoid valve and actuate a display device to display a malfunction of the brake system when a malfunction is detected. Additionally, or alternatively, the automatic brake control can be turned off in reaction to the detection of a malfunction. It is possible for the control unit and the hydraulic unit to be replaced separately and for the installation to be tested for proper functioning.
Abstract:
The invention relates to a safety system for a motor vehicle equipped with at least one braking system corresponding to a wheel unit. Furthermore, an automatic transmission system is provided which changes its ratio automatically based on specific shift criteria. A safety-relevant signal is generated in dependence upon a detection unit which detects states critical to safety of the brake system of the motor vehicle. According to the invention, the temperature of at least one brake system is applied for generating the signal relevant to safety. The shift criteria for the automatic transmission are changed in dependence upon this safety-relevant signal.
Abstract:
A method for controlling the air pressure in tires able to be mounted on two powered axles of a motor vehicle, as a function of a driving situation, an engine torque being distributable to the two axles by a distributor clutch, and a plurality of input values being converted in a processing unit into an air pressure value describing the air pressure in each tire, a clutch friction value, which represents the clutch status, being processed into a control value in the processing unit as well. Also, a device which includes means for implementing such a method.