| 摘要 |
PROBLEM TO BE SOLVED: To simplify the structure of a hill start auxiliary device (HSA) as much as possible, to reduce the cost, and to reduce the load on an anti-skid brake control system (ABS) modulator during the traction control as much as possible. SOLUTION: When a traction control system (TRC) solenoid valve 85 is switched during the idling trend of driving wheels 22, 23, a relay valve 54 generates the output regulated according to the indicated pressure with the air in an air tank 3', first and second TRC cut valves 88, 89 are switched with the air in the air tank 3', driving wheels 20, 21 are braked, and their driving force is reduced. When HAS solenoid valves 76, 77 are set to the second position II, the air in the air tanks 3, 3' is supplied to a second indicated pressure inlet 73 as the indicated pressure. Because the relay valves 53, 54 generate the output according to the indicated pressure, wheels 9, 10, 20, 20', 21, 21' are maintained in a braked condition to prevent a vehicle from moving. |
