Fuel injection timing control apparatus and control method thereof for in-cylinder injection gasoline engine
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02D-041/04
F01M-011/00
출원번호
US-0414243
(2003-04-16)
우선권정보
JP-0163578 (2002-04-26)
발명자
/ 주소
Ito, Yukikazu
Hirose, Kiyoo
Honda, Koji
출원인 / 주소
Toyota Jidosha Kabushiki Kaisha
대리인 / 주소
Kenyon & Kenyon
인용정보
피인용 횟수 :
9인용 특허 :
0
초록▼
A fuel injection mode is flexibly controlled according to the actual extent of adverse effects on an internal combustion engine from both deterioration of exhaust gas emissions and fuel dilution caused by fuel adhering to the piston top face and the cylinder inner peripheral face. A dilution degree
A fuel injection mode is flexibly controlled according to the actual extent of adverse effects on an internal combustion engine from both deterioration of exhaust gas emissions and fuel dilution caused by fuel adhering to the piston top face and the cylinder inner peripheral face. A dilution degree counter value C is counted up when a coolant temperature at engine startup THWST and an intake air quantity sum value after engine startup GASUM are each equal to, or less than, respective predetermined values. A fuel dilution flag is set to “ON” when the dilution degree counter value C is equal to, or greater than, a predetermined value CH. A fuel injection timing of an intake stroke injection is changed to a timing on the advance side when this fuel dilution flag is “ON.”
대표청구항▼
1. A fuel injection control apparatus for an in-cylinder injection internal combustion engine in which fuel is directly injected into a cylinder of the internal combustion engine, the fuel injection control apparatus comprising:a dilution degree estimating portion that estimates a degree of fuel dil
1. A fuel injection control apparatus for an in-cylinder injection internal combustion engine in which fuel is directly injected into a cylinder of the internal combustion engine, the fuel injection control apparatus comprising:a dilution degree estimating portion that estimates a degree of fuel dilution by fuel of overall lubricating oil supplied to lubricate the internal combustion engine; anda control portion that controls a fuel injection mode so as to inhibit dilution by fuel of the lubricating oil when the estimated degree of fuel dilution is larger than a predetermined value;wherein the dilution degree estimating portion estimates the degree of fuel dilution based on an operating history of the internal combustion engine. 2. The fuel injection control apparatus according to claim 1, wherein the control portion changes a fuel injection timing as the fuel injection mode so as to inhibit the fuel dilution. 3. The fuel injection control apparatus according to claim 2, wherein the control portion selects the fuel injection timing from among a plenty of fuel injection timings that are set in advance. 4. The fuel injection control apparatus according to claim 3, wherein the fuel injection timing is set based on a fuel injection quantity and a rotational speed of the internal combustion engine, or an intake air quantity and the rotational speed of the internal combustion engine. 5. The fuel injection control apparatus according to claim 2, wherein the fuel injection timing is a timing on an advance side. 6. The fuel injection control apparatus according to claim 5, wherein the fuel injection timing is when a piston in the cylinder is near top dead center. 7. The fuel injection control apparatus according to claim 1, wherein the dilution degree estimating portion monitors whether the internal combustion engine was operating in state in which the degree of fuel dilution increases and estimates the degree of fuel dilution based on that monitored history. 8. The fuel injection control apparatus according to claim 7, wherein the dilution degree estimating portion estimates a total amount of combustion heat generated within the cylinder from engine startup until engine stop based on an operating state of the engine, and determines that the internal combustion engine was operating in a state in which the degree of fuel dilution increases when an engine temperature at engine startup is equal to, or less than, a predetermined temperature and the estimated total amount of combustion heat is equal to, or less than, a predetermined amount. 9. The fuel injection control apparatus according to claim 8, wherein the dilution degree estimating portion determines that the total amount of combustion heat is equal to, or less than, the predetermined amount when an intake air quantity sum value or a fuel injection quantity sum value, from engine startup to engine stop, is equal to, or less than, a predetermined value. 10. The fuel injection control apparatus according to claim 7, wherein:the dilution degree estimating portion determines whether the degree of fuel dilution is decreasing or increasing based on a temperature of the lubricating oil or a parameter that correlates with that temperature, and estimates the degree of fuel dilution based on a size of a counter value which is counted up when a history of operation of the internal combustion engine in a state in which the degree of fuel dilution increases has been generated, and which is gradually counted down when it has been determined that the degree of fuel dilution is decreasing; andthe control portion executes a control according to the fuel injection mode based on the size of the counter value. 11. A fuel injection control apparatus for an in-cylinder injection internal combustion engine in which fuel is directly injected into a cylinder of the internal combustion engine, the fuel injection control apparatus comprising:a dilution degree estimating portion that estimates a degree of fue l dilution by fuel of overall lubricating oil supplied to lubricate the internal combustion engine; anda control portion that controls a fuel injection mode so as to inhibit dilution by fuel of the lubricating oil when the estimated degree of fuel dilution is larger than a predetermined value;wherein the dilution degree estimating portion estimates the degree of fuel dilution by calculating a rate of increase in the degree of fuel dilution based on a parameter that correlates with an amount of fuel adhered to a cylinder inner peripheral face due to fuel injection, sequentially updating the degree of fuel dilution based on the calculated rate of increase, and learning this updated degree of fuel dilution. 12. The fuel injection control apparatus according to claim 11, wherein the dilution degree estimating portion selects as the parameter that correlates with the amount of fuel adhered to the cylinder inner peripheral face at least one of a fuel injection quantity, a fuel injection timing, and an engine temperature, when calculating the rate of increase in the degree of fuel dilution. 13. The fuel injection control apparatus according to claim 11, wherein the dilution degree estimating portion estimates the degree of fuel dilution by further estimating a fuel evaporation amount, which is the amount of fuel evaporated from the overall lubricating oil, based on a temperature of the lubricating oil or a parameter that correlates with that temperature, calculating a rate of decrease in the degree of fuel dilution based on the estimated fuel evaporation amount, sequentially updating the degree of fuel dilution based on the calculated rate of decrease and the calculated rate of increase, and learning the updated degree of fuel dilution. 14. A fuel injection control method for an in-cylinder injection internal combustion engine in which fuel is directly injected into a cylinder of the internal combustion engine, the control method comprising the steps of:estimating a degree of fuel dilution by fuel of overall lubricating oil supplied to lubricate the internal combustion engine;controlling a fuel injection mode so as to inhibit dilution by fuel of the lubricating oil when the estimated degree of fuel dilution is larger than a predetermined value; andestimating the degree of fuel dilution based on an operating history of the internal combustion engine. 15. A fuel injection control method for an in-cylinder injection internal combustion engine in which fuel is directly injected into a cylinder of the internal combustion engine, the control method comprising the steps of:estimating a degree of fuel dilution by fuel of overall lubricating oil supplied to lubricate the internal combustion engine;controlling a fuel injection mode so as to inhibit dilution by fuel of the lubricating oil when the estimated degree of fuel dilution is larger than a predetermined value; andestimating the degree of fuel dilution by calculating a rate of increase in the degree of fuel dilution based on a parameter that correlates with an amount of fuel adhered to a cylinder inner peripheral face due to fuel injection, sequentially updating the degree of fuel dilution based on the calculated rate of increase, and learning this updated degree of fuel dilution.
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이 특허를 인용한 특허 (9)
Honda,Koji; Hirowatari,Seiji; Idogawa,Masanao, Air-fuel ratio control apparatus for internal combustion engine.
DeAngelis, Joseph Michael; Scannell, Michael Ryan; Blin, Gregory; Sanghvi, Rama; Thomas, Joseph Lyle, Controlling an internal combustion engine through modeling compensation of PCV fuel flow due to oil dilution.
Honda,Koji; Teraoka,Masahiko; Idogawa,Masanao; Hirowatari,Seiji, Fuel injection control apparatus for direct injection type internal combustion engine.
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