To provide an automatic brake device capable of controlling brake force even in an automatic brake actuation mode.
This automatic brake device uses an intake negative pressure actuation type brake booster 410 consisting of a first chamber 412 for introducing intake negative pressure and a diaphragm 413. A three-way electromagnetic change-over valve 411 is provided to a pile line for communicating the first chamber 412 with an intake pipe 414 in an engine 421. In a normal mode, the first chamber 412 is communicated with atmosphere. In an automatic brake actuation mode, the three-way electromagnetic change-over valve 411 is switched, communicating the first chamber 412 with the intake pipe 414. In addition, the intake pipe 414 is provided with a throttle valve, so called an electrically controlled throttle 420, for controlling closing motion by means of an electric motor. In the automatic brake actuation mode, the electrically controlled throttle 420 controls the opening of the throttle valve. The resulting control for the intake negative pressure entails fine control for brake force generated from the brake booster 410.
MINOWA TOSHIMICHI
KURAGAKI SATOSHI
