Direct injection type internal combustion engine
First Claim
1. A direct injection type engine having a combustion chamber, an intake passage and an exhaust passage, said engine comprising:
- an air-fuel mixture forming means for forming an air-fuel mixture in a restricted region in the combustion chamber when an engine load is lower than a predetermined load and for forming an air-fuel mixture spreading over the entire interior of the combustion chamber when the engine load is higher than said predetermined load;
a spark plug arranged in the combustion chamber to ignite said air-fuel mixture;
catalytic means arranged in said exhaust passage for purifying the exhaust gas;
detecting means for detecting a temperature of said catalytic means;
fuel vapor supply means for purging fuel vapor into the intake passage; and
control means for controlling said fuel vapor supply means to prohibit the purging operation of the fuel vapor when the engine load is lower than said predetermined load and the temperature, of said catalytic means is lower than a predetermined tolerable minimum temperature at which the exhaust gas is purified.
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Accused Products
Abstract
A direct injection type engine in which an air-fuel mixture formed in a restricted region in the combustion chamber is burned in the presence of excess air when the engine is operating under a light load. A uniform air-fuel mixture is formed in the combustion chamber when the engine becomes high, a fuel vapor is purged into the intake passage of the engine from the charcoal canister, and a catalytic converter is arranged in the exhaust passage of the engine. To prevent fuel vapor from being discharged to the outside air, the purging of fuel vapor into the intake passage is stopped when the engine is operating under a light load and the temperature of the catalyzer of the catalytic converter is low.
53 Citations
16 Claims
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1. A direct injection type engine having a combustion chamber, an intake passage and an exhaust passage, said engine comprising:
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an air-fuel mixture forming means for forming an air-fuel mixture in a restricted region in the combustion chamber when an engine load is lower than a predetermined load and for forming an air-fuel mixture spreading over the entire interior of the combustion chamber when the engine load is higher than said predetermined load; a spark plug arranged in the combustion chamber to ignite said air-fuel mixture; catalytic means arranged in said exhaust passage for purifying the exhaust gas; detecting means for detecting a temperature of said catalytic means; fuel vapor supply means for purging fuel vapor into the intake passage; and control means for controlling said fuel vapor supply means to prohibit the purging operation of the fuel vapor when the engine load is lower than said predetermined load and the temperature, of said catalytic means is lower than a predetermined tolerable minimum temperature at which the exhaust gas is purified. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification