US 11,851,043 B2
Method for determining a start time for a recharging procedure for a plunger device of an electronically slip-controllable power brake system, and electronically slip-controllable power brake system having a plunger device
Stefan Zahariev, Ilsfeld (DE); Bertram Foitzik, Ilsfeld (DE); and Jens Wagner, Untergruppenbach (DE)
Assigned to ROBERT BOSCH GMBH, Stuttgart (DE)
Appl. No. 17/267,705
Filed by Robert Bosch GmbH, Stuttgart (DE)
PCT Filed Jul. 11, 2019, PCT No. PCT/EP2019/068741
§ 371(c)(1), (2) Date Feb. 10, 2021,
PCT Pub. No. WO2020/043383, PCT Pub. Date Mar. 5, 2020.
Claims priority of application No. 102018214820.1 (DE), filed on Aug. 31, 2018.
Prior Publication US 2021/0316703 A1, Oct. 14, 2021
Int. Cl. B60T 8/40 (2006.01); B60T 8/172 (2006.01)
CPC B60T 8/4072 (2013.01) [B60T 8/172 (2013.01); B60T 2250/03 (2013.01); B60Y 2400/81 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A method for determining a start time for a recharging procedure of a plunger device of an electronically slip-controllable power brake system, the plunger device having a plunger cylinder, a plunger piston which is movably accommodated in the plunger cylinder, and a plunger working space enclosed between the plunger cylinder and the plunger piston, the plunger device being operable by an actuable drive motor in a pressure buildup direction or in an oppositely directed pressure dissipation direction, and an operating range of the plunger device extending between a first end stop at which the plunger working space has a maximum volume, and a second end stop at which the plunger working space has a minimum value, the method comprising:
specifying, within the operating range of the plunger device, a working range restricted by a first range limit and a second range limit that is closer to the second end stop than the first range limit; and
based on the specified working range, ascertaining a start time for an operation of the plunger device for carrying out the recharging procedure as a function of characteristic values that describe a driving state of a vehicle equipped with the power brake system, and/or an operating state of the plunger device, such that the start time occurs when an actual position of the plunger piston of the plunger device lies within the working range;
wherein the specifying is performed to depend the second range limit on a nearness of a brake pressure present in a brake circuit of the power brake system to a blocking pressure level, such that, at the driving state and/or operating state, the nearer the brake pressure is to the blocking pressure level the closer the second range limit is to the second end stop.