Control apparatus for anti-skid brake system of motor vehicle

In an anti-skid brake system for a motor vehicle which includes:

• a first valve groups of electromagnetic brake application valves and electromagnetic release valves provided in association with a first group of wheel brakes of said motor vehicle;
• a second valve group of electromagnetic brake application valves and electromagnetic release valves provided in association with a second group of wheel brakes of said motor vehicle;
• and
• sensor means for detecting states of wheels of said motor vehicle;
• a control apparatus, comprising:
• a first coil group of exciting coils for actuating said brake application valves and said release valves, respectively, which belong to said first valve group;
• a second coil group of exciting coils for actuating said brake application valves and said release valves, respectively, which belong to said second valve group;
• a first switch group of switching elements connected in series to said exciting coils, respectively, which belong to said first coil group;
• a second switch group of switching elements connected in series to said exciting coils, respectively, which belong to said second coil group;
• power supply means for supplying a DC voltage selectively to said exciting coils of said first and second coil groups under control of valve control means which controls selectively said switching elements of said first and second switch groups to thereby selectively energize said exciting coils belonging to said first and second coil groups in dependence on detection signal outputted by said sensor means;
• and
• reverse current blocking means disposed in current paths extending between at least one of said switching elements belonging to either one of said first and second switch groups and said exciting coils belonging to either one of said first and second coil groups, respectively, said switching elements and said exciting coils being those provided in association with at least said brake application valves, respectively, which belong to either one of said first valve group and said second valve group.