摘要:
A method and an apparatus for controlling a braking system, the control unit of which controls the wheel brakes receiving reference variables for control purposes. If these reference variables are not available, the control unit produces, on the basis of a predefined braking force distribution between the front and rear axles and in the context of an emergency mode, reference variables which it sets at the wheel brakes.
摘要:
A hydraulic vehicle brake system in which normal service brake operation can be carried out by using external hydraulic energy, and in the event of a lack of external hydraulic energy, auxiliary brake operation by muscle power is possible, with a hydraulic transmission that comes from a master cylinder that can be actuated by means of the brake pedal. The external hydraulic energy is stored, for example, in an accumulator with a gas buffer, which can lead to a gas content in the hydraulic fluid for the service brake operation. The system includes a dual-circuit master cylinder associated with those wheel brakes of a vehicle axle that make a higher contribution to the vehicle deceleration and at the same time, cylinder/piston devices are installed between these wheel brakes and their associated service brake valves for the purpose of preventing hydraulic fluid from getting into these wheel brakes from the external energy source. The advantage is that neither gas nor air is carried into the wheel brakes where it could lead to the formation of bubbles in the event of a pressure drop and would be disadvantageous for an auxiliary brake operation by the master cylinder. The cylinder/piston devices increase the operational safety of the vehicle brake system when braking by muscle power.
摘要:
An electrohydraulic brake system as well as a method and a device for controlling the electrohydraulic brake system, in which a hydraulic fluid can be injected from an accumulator into corresponding wheel brake cylinders by valve means, where the hydraulic fluid can be delivered to the accumulator by a pump, whereby means are provided for measuring the temperature of the electrohydraulic brake system, in particular the temperature of the hydraulic fluid, as well as means for taking into account the measured temperature for open- and closed-loop control of the electrohydraulic brake system.
摘要:
A method and a device for controlling and/or regulating an electric motor. Such electric motors are used for example in motor vehicles in the form of pump motors. In general, the electric motor is supplied with electrical energy from a battery and/or using a generator. The controlling and regulation take place using a high-frequency pulse width modulation (PWM). When the electric motor is started, the PWM is used to continuously increase the motor current required for the operation of the electric motor, e.g. beginning from 0.
摘要:
A method and a device for compensating for an accumulator pressure in an electrohydraulic braking system of a motor vehicle, in which a valve arrangement controls an input of a hydraulic fluid from a pressure accumulator into wheel brake cylinders, the hydraulic fluid being deliverable by a pump into the pressure accumulator, in which a variable is defined that corresponds to a driving situation and/or a driver's command and that represents a setpoint wheel pressure with which at least one wheel brake cylinder is chargeable to achieve an optimal braking action, the variable is compared to another variable representing an accumulator pressure in the pressure accumulator to provide a comparison result, and the accumulator pressure is increased in response to the comparison result falling below a predefinable minimal difference between the variable representing the setpoint wheel pressure and the another variable representing the accumulator pressure.
摘要:
A method of controlling a pump in a brake system of a motor vehicle, in particular an electrohydraulic brake system, is described, where the pump can be controlled by a pump motor either uncycled or continuously and cycled, where the period of uncycled control and/or an initial pulse-pulse pause ratio at the start of cycled control can be varied as a function of a voltage applied to the pump motor before and/or at the start of and/or during uncycled control and/or as a function of an on-board voltage of the motor vehicle determined before and/or at the start of and/or during uncycled control.
摘要:
A method and a device for controlling and/or regulating an electric motor. Such electric motors are used for example in motor vehicles in the form of pump motors. In general, the electric motor is supplied with electrical energy from a battery and/or using a generator. The controlling and regulation take place using a high-frequency pulse width modulation (PWM). When the electric motor is started, the PWM is used to continuously increase the motor current required for the operation of the electric motor, e.g. beginning from 0.
摘要:
A control device for a reservoir charging pump of a braking system of a vehicle includes: an actuating device designed to actuate the reservoir charging pump into at least one normal mode having a normal rotational speed, and a receiving device designed to receive a variable provided by a vehicle-specific component with respect to a supply voltage provided to the reservoir charging pump. The actuating device is additionally designed to ascertain whether the variable received lies outside a normal value range that is specified for the normal mode, and, if necessary, to actuate the reservoir charging pump from the normal mode into at least one deviation mode having at least one setpoint rotational speed deviating from the normal rotational speed.
摘要:
A method and a device for the open- and/or closed-loop control of a generator or a dynamo in a vehicle. The generator supplies, at least part of the time, an electric motor located in a braking system, e.g., a pump motor, with electrical power. A main feature is that the generator is activated as a function of the pressure in the brake master cylinder, it being activated as soon as the pressure in the brake master cylinder exceeds an initial threshold value.
摘要:
A method for determining the rotary speed of an electrical machine, especially of a direct current motor, which is controlled in PWM operation, the tracking voltage of the electrical machine being measured and the rotary speed being ascertained from that. The rotary speed fluctuations are able to be substantially reduced if the electrical machine is controlled using a control signal which has a PWM phase, in which the electrical machine is periodically switched on and off using a prespecified pulse duty factor, and which has a measuring phase in which the electrical machine is switched off. The rotary speed is measured in the measuring phases, in this instance, and is calculated in the PWM phases based on a model.