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US 3,965,677 AGranted
Misfire detecting apparatus for an internal combustion engine
AssigneeToyota Jidosha Kogyo Kabushiki Kaisha
InventorsKenji Goto, Norio Shibata, Yukihide Hashiguchi
Life of this patent
Estimating the term…
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.
Claims10
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.
3 more elements
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.
7 more elements
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.
2 more elements
Dependencies are inferred from the claim text.