Air flow rate control device of engine and draining off method thereof

An air flow rate control apparatus of an engine for controlling air flow rate according to condition of said car engine comprising an idle revolution speed control apparatus installed under a throttle body and a throttle valve installed in a boa of said throttle body, upper flow side of said throttle body is connected with said boa detouring said throttle valve, characterized by further comprising,

• a cylinder portion forming said boa and a base part for installing said idle revolution speed control apparatus under said cylinder portion installed on said throttle body, a perpendicular cavity forming a part of said air passage led from said measuring part to said boa of said throttle body on the base part, and a water pool portion formed under said perpendicular cavity, a bottom part of said perpendicular cavity being lower than said measuring part, wherein said air passage part between said measuring part and said water pool portion serves as a drain passage where water in said measuring part falls into said water pool portion.

A throttle body of an air flow rate control apparatus of an engine for controlling air flow rate according to condition of said car engine comprising an idle revolution speed control apparatus installed under a throttle body and said throttle valve installed in a boa of said throttle body, upper flow side of said throttle body is connected with said boa detouring said throttle valve, characterized by further comprising,

• a cylinder portion forming said boa and a base part having a jointing surface for installing said idle revolution speed control apparatus under said cylinder portion installed on said throttle body, a perpendicular cavity being arranged to the base part,
• a lower part being closed, an upper part of said cavity being led to said boa and a side part of said cavity being opened to said jointing surface, and a water pool portion formed under said perpendicular cavity, a lower part of the perpendicular cavity being lower than said side part.

An idle revolution speed control apparatus of a throttle body of an air flow rate control apparatus of an engine for controlling air flow rate according to condition of said car engine comprising an idle revolution speed control apparatus installed under a throttle body and said throttle valve installed in a boa of said throttle body, upper flow side of said throttle body is connected with said boa detouring said throttle valve, characterized by further comprising,

• an installation flange part having a jointing surface which is put together with a jointing surface of said base department arranged under than a cylinder portion of said throttle body, and
• an air passage opened to a jointing surface of said installation flange part and arranged on a position from a measuring part of said idle revolution speed control apparatus to said jointing surface, wherein
• a passage section bottom of said air passage is in a same level as or lower than a bottom end of said measuring part.

An air flow rate control apparatus of an engine for controlling air flow rate according to condition of said engine comprising an idle revolution speed control apparatus installed under a throttle body and a throttle valve installed in a boa of said throttle body, upper flow side of said throttle body is connected with said boa detouring said throttle valve, characterized by further comprising,

• a hot water passage passing through both of said throttle body and said idle revolution speed control apparatus.

An air flow rate control apparatus of an engine for controlling air flow rate according to condition of said engine comprising an idle revolution speed control apparatus installed under a throttle body and a throttle valve installed in a boa of said throttle body, upper flow side of said throttle body is connected with said boa detouring said throttle valve, characterized by further comprising,

• a hot water passage passing through both of said throttle body and said idle revolution speed control apparatus, a cylinder portion forming said boa and a base part having a jointing surface for installing said idle revolution speed control apparatus under said cylinder portion installed on said throttle body, and
• an installation flange part having a jointing surface installed on said jointing surface of said base part, wherein
• said hot water passage is opened to both of said jointing surface of said base part and said jointing surface of said installation flange part, and is located in a position extended over both of said base part and said installation flange part.

A drain off method of an air flow rate control apparatus of an engine for controlling air flow rate according to condition of said engine comprising an idle revolution speed control apparatus installed under a throttle body and a throttle valve installed in a boa of said throttle body, an upper flow side of said throttle body is connected with said boa detouring said throttle valve, characterized by comprising the steps of,

• pooling a water in a measuring part of said idle revolution speed control apparatus in a water pool portion formed in an air passage led from a measuring part of the measuring part to said boa of throttle body while the engine is not actuated,
• absorbing to drain the water pooled in said water pool portion through said boa of said throttle body by utilizing cranking air negativ pressure when said engine is started.