Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
  • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
  • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
  • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
  • B60T8/36—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition including a pilot valve responding to an electromagnetic force
  • B60T8/3615—Electromagnetic valves specially adapted for anti-lock brake and traction control systems
  • B60T8/3655—Continuously controlled electromagnetic valves
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
  • B60T7/00—Brake-action initiating means
  • B60T7/12—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger
  • B60T7/122—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger for locking of reverse movement
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
  • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
  • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
  • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
  • B60T8/48—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition connecting the brake actuator to an alternative or additional source of fluid pressure, e.g. traction control systems
  • B60T8/4809—Traction control, stability control, using both the wheel brakes and other automatic braking systems
  • B60T8/4827—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems
  • B60T8/4863—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems closed systems
  • B60T8/4872—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems closed systems pump-back systems
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
  • B60T2201/00—Particular use of vehicle brake systems; Special systems using also the brakes; Special software modules within the brake system controller
  • B60T2201/06—Hill holder; Start aid systems on inclined road

Definitions

• HHC Hillhold Control function
• the invention relates to a method for controlling the changeover valve of a brake circuit designed for driver-independent brake pressure build-up in the context of a vehicle standstill function, in which
• the switching valve is driven with a first, different from zero, current and
• the change-over valve is activated with a second, different current value, different from zero and second current intensity
• the second current is selected so that the switching valve is securely closed at this current.
• the switching valve is a normally open valve
• An advantageous embodiment of the invention is characterized in that the transition to the second phase takes place when the driver reduces the intensity of the brake application.
• An advantageous embodiment of the invention is characterized in that the first current intensity is selected so that the changeover valve just closes at a predetermined pressure difference applied thereto.
• An advantageous embodiment of the invention is characterized in that it is a small pressure difference at the predetermined pressure difference.
• An advantageous embodiment of the invention is characterized in that it is at the predetermined pressure difference to a pressure difference between 2 and 8 bar, in particular 5 bar, is.
• An advantageous embodiment of the invention is characterized in that the brake circuit is a hydraulic brake circuit.
• the invention further relates to a device for controlling the switching valve of a brake circuit designed for driver-independent brake pressure build-up as part of a vehicle standstill function, comprising Standstill detection means by means of which the stoppage of the vehicle is detected,
• Brake actuation detection means by means of which the actuation of the brake is detected by the driver; energizing means, by means of which the changeover valve is supplied with current, the energizing means being designed so that, as long as the driver actuates the brake during standstill,
• the changeover valve is activated with a first, non-zero, current intensity, and during a subsequent second phase the changeover valve is actuated with a second, different current power from the second and second current intensity,
• the drawing comprises the figures 1 to 5.
• FIG. 1 shows the topological structure of a hillhold function
• Figure 2 shows the time course of different sizes in a first embodiment for the control of the changeover valve (UPS).
• UPS changeover valve
• FIG. 3 shows the variation with time of various variables in a second embodiment for the control of the changeover valve (UPS).
• UPS changeover valve
• FIG. 4 shows the variation with time of various variables in a third embodiment for the control of the changeover valve (UPS).
• FIG. 5 shows in a flow chart the sequence of the method according to the invention.
• Fig. 1 is a schematic manner, the brake system one with a
• brake circuit 1 is the left branch in Fig. 1 (also referred to as the swim circle) which is the right branch
• Brake circuit 2 (also referred to as a bar circle).
• the brake circuit 1 extends over the rear wheels and the brake circuit 2 extends over the front wheels.
• This division is also referred to as Il-division.
• HSVl high-pressure switching valve of brake circuit 1
• EVHL intake valve at rear left, i.e. at brake of left rear wheel
• HSV2 high pressure switching valve of brake circuit 2
• RFP2 return pump of brake circuit 2
• Brake pressure control device 300 This is a branch to the high-pressure switching valves 302 and 305 and to the switching valves 303 and 304.
• the high-pressure switching valve 302 is connected to the outlet valves 309 and 310 and the suction side of the return pump 306.
• the switching valve 303 is connected to the intake valves 308 and 311 and the delivery side of the return pump
• the output side of the intake valve 308 and the input side of the exhaust valve 309 are connected to the wheel brake 316, as are the intake valve 311 and the exhaust valve 310 with the wheel brake 317.
• the high-pressure switching valve 305 is connected to the exhaust valves 313 and 314 and the suction side of the recirculation pump 307.
• the switching valve 304 is connected to the intake valves 312 and 315 and the delivery side of the return pump
• the output side of the intake valve 312 and the input side of the exhaust valve 313 are connected to the wheel brake 318, as are the intake valve 315 and the exhaust valve 314 with the wheel brake 319.
• the return pump 306 is located between the switching valve 303 (discharge side) and the discharge valve 310 (suction side), the return pump 307 is located between the switching valve 304 (delivery side) and the discharge valve 313 (suction side).
• the changeover valves 303 and 304 are closed with the required setpoint current as soon as the vehicle is at a standstill and the driver actuates the brake pedal.
• the UPS is energized only with a minimum current iUSVl, so that the UPS is closed without pressure.
• the minimum current can be chosen so that the valve, e.g. is barely closed against a differential pressure of 5 bar. This is sufficient because there is no pressure drop across the UPS in the "driver braking at standstill" state. "" Only when the driver decelerates will the current be forced to the required command current iUSV2 to maintain pressure.
• a query is made in block 501 as to whether the driver is applying the brake. This can be done, for example, by checking whether the brake pressure in the master cylinder exceeds a threshold value. If the answer is "no" (always marked “n” in FIG. 5), then branch back to block 500.
• a query is made as to whether the vehicle is at a standstill. If the answer is "no", then branch back to block 500. If the answer is yes, then in block 503 the switching valve is then actuated with a first current value iUSV1.
• a query is made as to whether the driver is reducing the intensity of the brake pedal actuation. This can for example be done by checking whether a negative change in the brake pressure in
• the change-over valve is then actuated with a second current iUSV2 in block 505.
• the second current intensity is selected such that the UPS closes stronger or more securely here than at the first current intensity inventive method.

Applications Claiming Priority (2)

Publications (1)

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ID=40456691

Family Applications (1)

Country Status (6)

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Family Cites Families (10)

• 2008
  • 2008-03-03 DE DE102008012353A patent/DE102008012353A1/de active Pending
  • 2008-12-16 CN CN2008801277866A patent/CN101965283A/zh active Pending
  • 2008-12-16 EP EP08873109A patent/EP2252488A1/de not_active Withdrawn
  • 2008-12-16 WO PCT/EP2008/067618 patent/WO2009109254A1/de active Application Filing
  • 2008-12-16 KR KR1020107019571A patent/KR20100123706A/ko not_active Application Discontinuation
  • 2008-12-16 US US12/736,047 patent/US20110148186A1/en not_active Abandoned

Non-Patent Citations (1)

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