Brake booster negative pressure controller

A brake booster negative pressure controller comprising a brake booster, a throttle valve whose opening angle can be operated independently from a stroke of an acceleration, a negative pressure sensing means for sensing a negative pressure in the brake booster, a negative pressure determining means for determining that the negative pressure sensed by said negative pressure sensing means is equal to or lower than a threshold, and a means for closing said throttle valve by a predetermined amount when it is determined by said negative pressure determining means that the negative pressure is equal to or lower than the threshold, wherein the controller comprising:

• a means for closing said throttle valve by a predetermined amount when the negative pressure is determined to be equal to or lower than the threshold in any of one or more other negative pressure determining means for determining that the negative pressure sensed by said negative pressure sensing means is equal to or lower than a predetermined value;
• two or more negative pressure determining means for determining that the negative pressure sensed by any of one or more brake booster negative pressure sensing means is equal to or lower than a predetermined value;
• and
• a means for closing said throttle valve by a predetermined amount when the negative pressure is determined to be equal to or lower than a threshold in any of said two or more negative pressure determining means.

A brake booster negative pressure controller comprising:

• a brake booster;
• a throttle whose opening angle can be operated independently from a stroke of an acceleration;
• a negative pressure sensing means for sensing a negative pressure in the brake booster;
• a negative pressure determining means for determining that the negative pressure sensed by said negative pressure sensing means is equal to or lower than a threshold;
• and a means for closing said throttle valve by a predetermined amount when it is determined by said negative pressure determining means that the negative pressure is equal to or lower than the threshold, wherein said brake booster negative pressure controller comprising:
• a means for closing said throttle valve by a predetermined amount when it is determined that the negative pressure is equal to or lower than the threshold in any of at least one of other negative pressure determining means for determining that the negative pressure sensed by said negative pressure sensing means is equal to or lower than a predetermined value;
• a means for closing the throttle valve by a predetermined amount when the difference of recognition values of signals of said negative pressure sensing means between said negative pressure determining means and said one or more negative pressure determining means is equal to or larger a predetermined value;
• one or more other brake booster negative pressure sensing mechanism;
• a means for closing said throttle valve by a predetermined amount when the negative pressure is determined to be equal to or lower than a threshold in any of two or more negative pressure determining means which determine that the negative pressure sensed by said one or more other negative pressure sensing means is equal to or lower than a predetermined value;
• and
• a means for closing the throttle valve by a predetermined amount when the difference of recognition values of signals from said negative pressure sensing means between said two or more negative pressure determining means is equal to or larger than a predetermined value.

A brake booster negative pressure controller comprising a brake booster, a throttle whose opening angle can be operated independently from a stroke of an acceleration, a negative pressure sensing mechanism for sensing a negative pressure in the brake booster, a negative pressure determining means for determining that the negative pressure sensed by said negative pressure sensing mechanism is equal to or lower than a threshold, and a means for closing said throttle valve by a predetermined amount when it is determined by said negative pressure determining means that the negative pressure is equal to or lower than the threshold, wherein said brake booster negative pressure controller comprising:

• one or more other negative pressure determining means for determining that a negative pressure sensed by said negative pressure sensing means is equal to or lower than a predetermined value;
• a means for closing said throttle valve by a predetermined amount when the negative pressure is determined to be equal to or lower than the threshold in said one or more other negative pressure determining means;
• one or more other brake booster negative pressure sensing means;
• two or more negative pressure determining means for determining that the negative pressure sensed by said at least one other negative pressure sensing means is equal to or lower than a predetermined value;
• and
• a means for closing said throttle valve by a predetermined amount when determination results in said two or more negative pressure determining means do not coincide with each other.