Toyota Jidosha Kabushiki Kaisha

Kouji Yotsuya

Masahiro Hara

Yasuji Mizutani

Tomihiro Wada

Tatsuo Sugitani

Hiromi Tanaka

In a vehicle brake control device, it is determined whether a first starting condition, that a master cylinder pressure and a rate of change of the master cylinder pressure are equal to or more than respective first reference values, is satisfied. Furthermore, it is determined whether a second starting condition is satisfied based on a determination as to whether the master cylinder pressure is equal to or more than a second reference value at a time when a predetermined time has elapsed since a time when the first starting condition was satisfied. In a case where the second starting condition is determined as being satisfied, a brake assist control is executed until a termination condition of the brake assist control is satisfied.

Vehicle braking force control device and control method of the same

A braking force control device and method performs brake assist control. A timer CT begins to count the elapsed time, for example, from when the elevation gradient &Dgr;P,of a master cylinder pressure P,becomes equal to or greater than a first threshold value TH,. It is determined that an emergency brake operation is executed, when the master cylinder pressure P,becomes equal to or greater than a second threshold value TH,before a predetermined time has passed, and then the brake assist control starts.

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Numadu, Japan

Kouji Yotsuya