Misfire detecting apparatus for an internal combustion engine
First Claim
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1. Misfire detecting apparatus for an internal combustion engine, comprising:
- means to detect a maximum value of a pulsating exhaust pressure of the internal combustion engine;
means to detect a minimum value of the pulsating exhaust pressure;
means to detect a suction pressure and provide a value proportional to the suction pressure;
means to form a difference between the maximum value and the minimum value;
addition means to add the difference to the value proportional to the suction pressure; and
means to compare the result of addition of said addition means with a predetermined value.
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Abstract
A value proportional to suction pressure is added to the difference between the maximum value and the minimum value of a pulsating exhaust pressure. When the sum exceeds a predetermined value, misfire of an engine is detected. The difference and the sum are formed electrically or pneumatically.
25 Citations
10 Claims
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1. Misfire detecting apparatus for an internal combustion engine, comprising:
- means to detect a maximum value of a pulsating exhaust pressure of the internal combustion engine;
means to detect a minimum value of the pulsating exhaust pressure;
means to detect a suction pressure and provide a value proportional to the suction pressure;
means to form a difference between the maximum value and the minimum value;
addition means to add the difference to the value proportional to the suction pressure; and
means to compare the result of addition of said addition means with a predetermined value. - View Dependent Claims (2, 3, 4, 5, 6)
- means to detect a maximum value of a pulsating exhaust pressure of the internal combustion engine;
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7. An internal combustion engine comprising:
- a catalytic converter incorporated in an exhaust pipe of the engine;
a by-pass pipe connected in parallel with said converter;
a control valve for selectively passing exhaust gas of the engine through either of said converter and said by-pass pipe;
means to operate said control valve;
means to detect a maximum value of a pulsating exhaust pressure of the engine;
means to detect a minimum value of the pulsating exhaust pressure;
means to detect a suction pressure and provide a value proportional to the suction pressure;
means to form a difference between the maximum value and the minimum value;
addition means to add the difference to the value proportional to the suction pressure; and
means to compare the result of addition of the addition means with a predetermined value and energize said means to operate said control valve. - View Dependent Claims (8)
- a catalytic converter incorporated in an exhaust pipe of the engine;
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9. An internal combustion engine comprising:
- a catalytic converter incorporated in an exhaust pipe of the engine;
a by-pass pipe connected in parallel with said converter;
a control valve for selectively passing exhaust gas of the engine through either of said converter and said by-pass pipe;
means to operate said control valve;
a pneumatic operational unit including a housing, a first, a second, a third and a fourth diaphragm chamber divided from one another by a first, a second, and a third diaphragm in said housing, said first diaphragm chamber being connected to a suction system of the engine, said second diaphragm chamber being connected to an exhaust system of the engine through a first parallel circuit including a first check valve opening in the direction of the exhaust system and a first throttle, said third diaphragm chamber being connected to the exhaust system of the engine through a second parallel circuit including a second check valve opening in the opposite direction of said first check valve and a second throttle, said fourth diaphragm chamber opening to atmosphere, and a rod coupled commonly to said first, second and third diaphragms, said rod being coupled to said means to operate said control valve. - View Dependent Claims (10)
- a catalytic converter incorporated in an exhaust pipe of the engine;
Specification