A hydraulic control apparatus for a multi-stage automatic transmission
includes solenoid valves such as the linear solenoid valves that are
formed as normally closed valves. A first clutch apply relay valves that
outputs a forward range pressure as a reverse input pressure during an
all-solenoid-off mode, and a second clutch apply relay valve that
switches between a left half position that inputs a reverse input
pressure to a discharge port and a right half position that inputs the
reverse pressure to the discharge port are provided. The second clutch
apply relay valve is set to the right half position during normal engine
startup and locked based on the lock pressure by feeding the line
pressure as a lock pressure and is set at the left half position that
interrupts the lock pressure after the engine is restarted during
all-solenoids-off.