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
  • B60T10/00—Control or regulation for continuous braking making use of fluid or powdered medium, e.g. for use when descending a long slope
  • B60T10/02—Control or regulation for continuous braking making use of fluid or powdered medium, e.g. for use when descending a long slope with hydrodynamic brake
• • 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
  • B60T1/00—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles
  • B60T1/02—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels
  • B60T1/08—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels using fluid or powdered medium
  • B60T1/087—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels using fluid or powdered medium in hydrodynamic, i.e. non-positive displacement, retarders

Definitions

• the invention relates to a method for filling a retarder with operating medium by means of valve devices which are connected to a storage container with a storage air pressure P v and convey operating medium with a control pressure P ⁇ into the retarder, with T being switched on for a first time interval after the retarder has been switched on the overshoot control pressure P Y (Ü), which is above the nominal pressure P Y NENN for the nominal braking torque to be set, and the overshoot control pressure P Y (Ü) is reduced to the nominal pressure P Y NENN in a second time period T 2 .
• valve devices which are connected to a storage container with a storage air pressure P v and convey operating medium with a control pressure P ⁇ into the retarder, with T being switched on for a first time interval after the retarder has been switched on the overshoot control pressure P Y (Ü), which is above the nominal pressure P Y NENN for the nominal braking torque to be set, and the overshoot control pressure P Y (Ü) is
• the invention also provides a control device for carrying out the method according to claim 10.
• the braking torque of a hydrodynamic retarder is built up on request by, for example, the driver of a vehicle in that the working space is filled with working medium or operating medium, preferably oil or water.
• Retarders corresponds to the operating medium in the work area.
• a control device, as described above, for a retarder has become known, for example, from DE-A-41 13 539.
• the control device for a retarder according to DE-A-41 13 539 comprises a collecting tank, which is in fluid communication with the retarder, and a pressure adjustment component, which can be in atmospheric communication with the collecting tank, around the compressed air flowing into the collecting tank a predetermined restriction to be imposed in accordance with the respective fixed pressure level generated in the retarder.
• the object of the invention is to overcome the disadvantages of the prior art described above.
• Brake fluid level can be set.
• the retarder speed is taken into account by decreasing the height P Y (Ü) and the duration 7 ⁇ and T 2 of the overshoot pressure with increasing retard speed or vehicle speed.
• the preceding braking requirements for example the duration of the braking / pause intervals or the retarder braking stage and the retarder braking stage actuation speed, can also influence the build-up of the retarder braking torque.
• Another size that the preceding braking requirements for example the duration of the braking / pause intervals or the retarder braking stage and the retarder braking stage actuation speed, can also influence the build-up of the retarder braking torque.
• the behavior of the retarder when it is switched on is influenced by the level of the equipment, ie the level of working fluid, for example that of the oil in the reservoir.
• the level of the equipment ie the level of working fluid, for example that of the oil in the reservoir.
• the duration of the oversteer and the height is specified, the height P Y (Ü) and the duration T, and T 2 with decreasing
• the invention also provides a retarder control unit for carrying out the method; said computer unit, a control pressure setting device and sensor devices for detecting at least one of the following variables
• the retarder control unit is characterized in that the computer unit controls the control pressure setting device as a function of the detected signals such that an overshoot control pressure of a predetermined level or size and duration is set.
• Fig. 1 An example of the basic course of the control pressure P ⁇ as
• the formwork behavior of the retarder is now determined by the level of overriding of the nominal pressure, which is a maximum of up to the supply pressure of the
• Storage air can reach, as well as the duration of the override and the duration of the back regulation from the override to the nominal pressure determined. In order to optimize the switch-on behavior, these variables are dependent on vehicle status signals, such as the supply pressure, the temperature of the operating medium or else the
• the parameters for determining the temporal course of the control pressure are particularly preferably determined with the aid of a computer unit or an electronic control unit, specifically as a function of the physical variables ascertained with the aid of sensors, as stated above.
• the supply pressure P v of the vehicle which can be determined with the aid of a separate pressure sensor, may be mentioned here only as an example of the variables influencing the temporal pressure profile. In this way, it is possible to accommodate operational pressure fluctuations as well as various
• the retarder speeds that can be derived from the tachograph signal are only mentioned here, whereby at high speed and thus high retarder speeds only small overshoot pressure curves are necessary, in contrast to low retarder speeds that require high overshoot pressure curves for fast switching on.

Landscapes

• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Transportation (AREA)
• Mechanical Engineering (AREA)
• Transmission Of Braking Force In Braking Systems (AREA)
• Regulating Braking Force (AREA)
• Braking Arrangements (AREA)
• Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)

Priority Applications (6)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7885204

Family Applications (1)

Country Status (7)

Cited By (1)

Families Citing this family (8)

Citations (3)

Family Cites Families (3)

• 1998
  • 1998-10-22 DE DE19848546A patent/DE19848546C1/de not_active Expired - Fee Related
• 1999
  • 1999-09-29 JP JP2000578200A patent/JP3947655B2/ja not_active Expired - Fee Related
  • 1999-09-29 US US09/830,133 patent/US6601925B1/en not_active Expired - Fee Related
  • 1999-09-29 DE DE59905948T patent/DE59905948D1/de not_active Expired - Lifetime
  • 1999-09-29 EP EP99948898A patent/EP1121282B1/de not_active Expired - Lifetime
  • 1999-09-29 WO PCT/EP1999/007220 patent/WO2000024621A1/de not_active Ceased
  • 1999-09-29 AT AT99948898T patent/ATE242709T1/de not_active IP Right Cessation
  • 1999-09-29 BR BR9915157-0A patent/BR9915157A/pt not_active IP Right Cessation

Patent Citations (3)

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