Patent ES-2005419-A6 (ES)
Title: Anti-lock braking system esp. for vehicle rear wheels
Inventor: BROWN G EMERSON
IPC: B60T8/44
Filed: 1987-10-28
Abstract: The anti-lock braking system has a master cylinder for generating pressurised braking fluid in a hydraulic circuit which includes at least one wheel cylinder. A control generates signals in response to an incipient wheel skid condition. A brake pressure modulator is operatively connected to the hydraulic circuit between the master cylinder and the wheel cylinder. The brake pressure modulator includes a pump responsive to the control signals for pumping fluid from the wheel cylinder to the master cylinder. Pressure reducing appts. is connected between the pump and the master cylinder for producing a pressure drop in response to flow of fluid from the pump. - An isolating valve has a master cylinder inlet, a wheel cylinder outlet, a pressure fluid inlet of the pump, and pressure reducing appts input, and ports connected to the master cylinder, the wheel cylinder, the inlet of the pump and the input of the pressure reducing appts, respectively. The isolating valve normally establishes fluid communication between the master cylinder inlet port, wheel cylinder outlet port and pressure fluid inlet port and includes appts. connected to the pressure reducing appts. and operable in response to a pressure drop for isolating the master cylinder inlet port from the wheel cylinder port and pump inlet port. (1,2/2) EPAB- EP-385973 B An anti-lock braking system comprising: master cylinder means (12) for generating pressurised braking fluid in a hydraulic circuit (II) which includes at least one wheel cylinder (24,26), control means (64) for generating control signals in response to an incipient wheel skid condition, and a brake pressure modulator (22) operatively connected to said hydraulic circuit (II) between said master cylinder means (12) and said wheel cylinder (24,26) characterised in that said brake pressure modulator (22) includes a housing (22) with pump means (60,105) responsive to signals from said control means (64) for pumping fluid from said wheel cylinder (24,26) to said master cylinder (12), pressure reducing means (82,84,86) connected between said pump means (60,105) and said master cylinder (12), pressure reducing a pressure drop there across in response to flow of fluid from said pump means (60,105), an isolating valve (92) having a master cylinder inlet (34), a wheel cylinder outlet (42), a pressure fluid inlet (44) of the pump means (60,105) and a pressure reducing means input (88), and ports (38,42,48,54) connected to said master cylinder (12), said wheel cylinder (23,26), the inlet (44) of said pump means (60,105) and the input (88) of said pressure reducing means (82,84,86) respectively, said isolating valve (92) normally establishing fluid communication between the master cylinder inlet port (38), wheel cylinder outlet port (42) and e pressure fluid inlet port (48) and including means (94, 36) connected to said pressure reducing means (82,84,86) and operable in response to a pressure drop there across for isolating said master cylinder inlet port (38) from said wheel cylinder port (42) and pump means inlet port (48), the housing (22) containing therein the pump means (60,105), pressure reducing means (82,84,86), isolating valve (92), inlets (34,44), outlet (42), input (88), ports (38,42,48,54) and isolating means (94,36). - EP-385973 B An anti-lock braking system comprising: master cylinder means (12) for generating pressurised braking fluid in a hydraulic circuit (II) which includes at least one wheel cylinder (24,26), control means (64) for generating control signals in response to an incipient wheel skid condition, and a brake pressure modulator (22) operatively connected to said hydraulic circuit (II) between said master cylinder means (12) and said wheel cylinder (24,26) characterised in that said brake pressure modulator (22) includes a housing (22) with pump means (60,105) responsive to signals from said control means (64) for pumping fluid from said wheel cylinder (24,26) to said master cylinder (12), pressure reducing means (82,84,86) connected between said pump means (60,105) and said master cylinder (12), pressure reducing a pressure drop thereacross in response to flow of fluid from said pump means (60,105), an isolating valve (92) having a master cylinder inlet (34), a wheel cylinder outlet (42), a pressure fluid inlet (44) of the pump means (60,105) and a pressure reducing means input (88), and ports (38,42,48,54) connected to said master cylinder (12), said wheel cylinder (23,26), the inlet (44) of said pump means (60,105) and the input (88) of said pressure reducing means (82,84,86) respectively, said isolating valve (92) normally establishing fluid communication between the master cylinder inlet port (38), wheel cylinder outlet port (42) and e pressure fluid inlet port (48) and including means (94, 36) connected to said pressure reducing means (82,84,86) and operable in response to a pressure drop thereacross for isolating said master cylinder inlet port (38) from said wheel cylinder port (42) and pump means inlet port (48), the housing (22) containing therein the pump means (60,105), pressure reducing means (82,84,86), isolating valve (92), inlets (34,44), outlet (42), input (88), ports (38,42,48,54) and isolating means (94,36). - (7pp) - EP-385973 B An anti-lock braking system comprising: master cylinder means (12) for generating pressurised braking fluid in a hydraulic circuit (II) which includes at least one wheel cylinder (24,26), control means (64) for generating control signals in response to an incipient wheel skid condition, and a brake pressure modulator (22) operatively connected to said hydraulic circuit (II) between said master cylinder means (12) and said wheel cylinder (24,26) characterised in that said brake pressure modulator (22) includes a housing (22) with pump means (60,105) responsive to signals from said control means (64) for pumping fluid from said wheel cylinder (24,26) to said master cylinder (12), pressure reducing means (82,84,86) connected between said pump means (60,105) and said master cylinder (12), pressure reducing a pressure drop thereacross in response to flow of fluid from said pump means (60,105), an isolating valve (92) having a master cylinder inlet (34), a wheel cylinder outlet (42), a pressure fluid inlet (44) of the pump means (60,105) and a pressure reducing means input (88), and ports (38,42,48,54) connected to said master cylinder (12), said wheel cylinder (23,26), the inlet (44) of said pump means (60,105) and the input (88) of said pressure reducing means (82,84,86) respectively, said isolating valve (92) normally establishing fluid communication between the master cylinder inlet port (38), wheel cylinder outlet port (42) and e pressure fluid inlet port (48) and including means (94, 36) connected to said pressure reducing means (82,84,86) and operable in response to a pressure drop thereacross for isolating said master cylinder inlet port (38) from said wheel cylinder port (42) and pump means inlet port (48), the housing (22) containing therein the pump means (60,105), pressure reducing means (82,84,86), isolating valve (92), inlets (34,44), outlet (42), input (88), ports (38,42,48,54) and isolating means (94,36). (7pp)