The invention relates to a method for assisting the driver of vehicle when performing a driving maneuver, such as a parking and pulling in maneuver. To this end, a reference trajectory is determined along which the vehicle should be displaced. During the driving maneuver, a steering wheel position, which is to be set and which guides the vehicle along the reference trajectory, is indicated to the driver. The vehicle longitudinal speed is influenced independent of the driver when there is a difference between the actual steering angle set by the driver and the specified steering angle that corresponds to the required steering wheel position. This enables the driver to be provided with a longer reaction time in order to set the indicated steering wheel position.

Method for assisting a driver when performing driving maneuvers

In a brake system with electromechanical actuation, a test run is carried out when the vehicle is started, in the course of which at least one wheel brake is acted on by a control signal, which corresponds to a predetermined minimum braking action. If this minimum braking action is not reached in any one of the wheel brakes, the parking brake is not unlocked.

Method and apparatus for controlling the brake system of a vehicle

A brake force control apparatus having a pump
(100, 102) for pumping up brake fluid from a fluid pressure
passage (26, 28, 42, 44, 46, 48) connecting a master cylinder
(18) and a wheel cylinder (70, 72, 74, 76) is provided which
can accurately detect an amount of brake operation intended
by a driver during execution of a brake assist control. The
brake assist control is achieved by supplying the brake
fluid delivered by the pump (100, 102) to the wheel cylinder
(70, 72, 74, 76) when an emergency brake operation is
performed by a driver. The brake force control apparatus
has a control signal generator and a fluid pressure
controller. The control signal generator generates a
control signal (P M/C *) by compensating a decrease generated
in the output signal (P M/C ) when the pump (100, 102) pumps
up the brake fluid from the fluid pressure passage (26, 28,
42, 44, 46, 48). The fluid pressure controller performs
the brake assist control by using the control signal (*P M/C ).

Brake force control apparatus

An external control process is disclosed for a braking system, as well as a braking system suitable for applying this process. The invention should enable the braking system to be automatically brought to an appropriate actuation state by means of an appropriate sensor system, largely preventing endangering the driver or accidentally actuating the brakes. For that purpose, not only the surroundings of the brake pedal, but also additional parameters (d, d, vref) are monitored by a sensor device (6, 10, 11). The braking pressure (pnom) is automatically regulated in an appropriate manner depending on the individual evaluated parameters. Advantageous embodiments concern a preliminary actuation of the brakes, a slight actuation of the brakes or the automatic application of a higher braking pressure, depending on the measurement results, and to the extent to which this is made possible by road conditions and the possibility to recognise the driver's wishes.

Automatically actuated braking system

A hydraulic circuit has a rotary type pump comprising a rotor rotating with a driving shaft and a casing which holds the rotor and the driving shaft. The casing further comprises an inlet port through which fluid is introduced to spaces formed by the rotor, an outlet port through which fluid is discharged from the spaces, and a hydraulic path for leading fluid from clearance around said driving shaft to the outside of the casing. A reservoir is provided to store fluid coming through the hydraulic path. A return conduit is disposed between the reservoir and an upstream side conduit connected to the inlet port in order that fluid stored in the reservoir is returned to the upstream side conduit. In the return conduit, a check valve is disposed to prevent the reverse flow of fluid from the upstream side conduit to the reservoir.

Hydraulic circuit having a rotary type pump and brake apparatus for a vehicle provided with the same

The invention relates to a method for determining the start of an automatic braking process. In those instances where the brake pedal is actuated starting from an initially unactuated position, triggering of automatic braking occurs when the actuation speed of the brake pedal remains above a threshold trigger value for automatic braking, and a prescribed pedal travel is exceeded in a specific time interval after the start of the actuation of the brake pedal. Light depression of the brake pedal which takes place only briefly at a high pedal actuation speed does not lead to the automatic braking process being triggered.

Method for determining the start of an automatic braking process

Verfahren
zur Bestimmung eines Ausloseschwellenwertes
fur einen
automatischen Bremsvorgang, wobei wahrend des automatischen Bremsvorgangs ein
Bremsdruck erzeugt wird, der groser ist,
als der Bremsdruck, der der Stellung des, Bremspedals entspricht,
wobei der automatische Bremsvorgang dann ausgelost wird, wenn die Betatigungsgeschwindigkeit
(Vbp) des Bremspedals einen Ausloseschwellenwert
(AS) ubersteigt,
dadurch gekennzeichnet das der
Ab stand (Dist) zum vorausfahrenden Fahrzeug erfast wird,
und der Ausloseschwellenwert (AS)
des automa tischen Bremsvorgangs dann verringert wird, wenn der
Abstand zum vorausfahrenden Fahrzeug einen Grenzwert (G1) unterschreitet.

Verfahren zur Bestimmung eines Auslöseschwellenwertes für einen automatischen Bremsvorgang

A process and device are disclosed for preventing a vehicle from colliding with an obstacle during parking. The object of the invention is therefore to ensure that a collision can be reliably avoided without any additional intervention of the drive. In a device with at least one sensor for generating signals which represent the distance between the vehicle and an obstacle, the signals are processed in an evaluation unit. When at least one distance-representing signal falls below a limit value, a warning signal is generated. This warning signal drives a control valve which generates a pressure difference between the working chamber and the vacuum chamber in a brake booster when the warning signal is generated. This pressure difference causes the braking pressure to rise in the wheel brake cylinder and therefore slows the vehicle down to a standstill.

Preventing the collision of a vehicle with an obstacle

A procedure is provided to end an automatic braking operation such that unwanted ending of the automatic braking operation is prevented. If a switching operation of the switching element takes place within a predetermined time interval after the triggering of the automatic braking operation, the automatic braking operation is not automatically ended. The system monitors whether another switching operation takes place within the time interval. The other switching operation is the reverse of the first switching operation. If another switching operation takes place during the time interval, a second relative motion between the push rod and the component which can be moved within a defined motional play has taken place in this time period. Since the brake pedal is continuing to be actuated, the automatic braking operation is not then ended.

Process for ending an automatic braking operation

The device processes signals from one or more distance sensors, and generates a warning signal if a threshold is exceeded The braking system of the motor vehicle includes an assisted braking unit (4) with a valve controlled by the warning signal to create a higher pressure in the working chamber of the braking unit A method for collision avoidance is also claimed

Alexander Fuchs

Papers

Method for determining the start of an automatic braking process

Verfahren zur Bestimmung eines Auslöseschwellenwertes für einen automatischen Bremsvorgang

Preventing the collision of a vehicle with an obstacle

Process for ending an automatic braking operation

Vehicle collision avoidance device for parking