IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0758394
(2001-01-12)
|
우선권정보 |
JP-0006253 (2000-01-12) |
발명자
/ 주소 |
- Ito, Takashi
- Fukatsu, Katsuaki
- Kobayashi, Ryoichi
- Sugiura, Noboru
|
출원인 / 주소 |
- Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.
|
대리인 / 주소 |
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인용정보 |
피인용 횟수 :
11 인용 특허 :
1 |
초록
▼
A one-chip integration circuit including a power part and a control part integrated within an IGBT monolithic silicon substrate is disclosed. The control circuit part comprises a current limiting circuit for limiting a current so that it does not flow over a set-up value, a reference pulse generatin
A one-chip integration circuit including a power part and a control part integrated within an IGBT monolithic silicon substrate is disclosed. The control circuit part comprises a current limiting circuit for limiting a current so that it does not flow over a set-up value, a reference pulse generating circuit for detecting that an ignition control signal is inputted over a predetermined period of time, a digital timer made up by a digital counter, a latch circuit for dropping the gate voltage of the IGBT by latching due to the digital timer output signal and carrying out resetting when the ignition control signal is off, an input circuit having a potential comparison circuit in its input stage, in which the operation voltage for ignition control signal has a threshold value and a hysterisis, and an input protection circuit having a Zener diode and a resistor connected in parallel therewith for protecting the element from disturbance surges. A one-chip igniter with high operative stability and high reliability can be provided.
대표청구항
▼
A one-chip integration circuit including a power part and a control part integrated within an IGBT monolithic silicon substrate is disclosed. The control circuit part comprises a current limiting circuit for limiting a current so that it does not flow over a set-up value, a reference pulse generatin
A one-chip integration circuit including a power part and a control part integrated within an IGBT monolithic silicon substrate is disclosed. The control circuit part comprises a current limiting circuit for limiting a current so that it does not flow over a set-up value, a reference pulse generating circuit for detecting that an ignition control signal is inputted over a predetermined period of time, a digital timer made up by a digital counter, a latch circuit for dropping the gate voltage of the IGBT by latching due to the digital timer output signal and carrying out resetting when the ignition control signal is off, an input circuit having a potential comparison circuit in its input stage, in which the operation voltage for ignition control signal has a threshold value and a hysterisis, and an input protection circuit having a Zener diode and a resistor connected in parallel therewith for protecting the element from disturbance surges. A one-chip igniter with high operative stability and high reliability can be provided. pressure control value; and providing a temperature sensing element, the providing including using a model based on induction air temperature and engine coolant temperature with a statistical treatment. 11. The method of claim 1 further comprising: setting the time counter to zero if the temperature differential is less than or equal to the temperature control value. 12. The method of claim 1 further comprising: determining whether the engine is off. 13. The method of claim 1 further comprising: providing an engine management system to receive pressure and temperature signals from a pressure sensing element and a temperature sensing element. 14. The method of claim 1 wherein the comparing comprises: determining a leak condition if the time counter is greater than the time control value. 15. The method of claim 14 wherein the determining comprises: detecting a leak of about 0.5 millimeter. 16. The method of claim 14 wherein the determining comprises: detecting a leak of about 1 millimeter. 17. The method of claim 14 wherein the computing comprises: determining a no leak condition if the pressure differential is greater than the pressure control value. 18. The method of claim 1 further comprising: comparing the temperature differential to the temperature control value; and comparing the pressure differential to the pressure control value. 19. The method of claim 1 further comprising: providing a vacuum detection component having a temperature sensing element, a pressure sensing element and a control valve. 20. A method of leak detection in a closed vapor handling system of an automotive vehicle, wherein an engine is shut off, comprising: determining whether the engine is off; closing a shut off valve; providing a pressure sensing element, a temperature sensing element, and an engine management system to receive pressure and temperature signals from the pressure sensing element and temperature sensing element; obtaining a start temperature and start pressure; providing an evaluation temperature; calculating a temperature differential between the start temperature and the evaluation temperature; comparing the temperature differential to a temperature control value; incrementing a time counter if the temperature differential is greater than the temperature control value; setting the time counter to zero if the temperature differential is less than or equal to the temperature control value; computing a pressure differential between the start pressure and an evaluation pressure; comparing the pressure differential to a pressure control value; and comparing the time counter to a time control value if the pressure differential is not greater than the pressure control value. 21. An automotive evaporative leak detection system comprising: a pressure sensing element; a temperature sensing element; and a processor operatively coupled to the pressure sensing element and the temperature sensing element and receiving, respectively, pressure and temperature signals therefrom; wherein the processor calculates a temperature differential between a start temperature and an evaluation temperature, increments a time counter, computes a pressure differential between a start pressure and an evaluation pressure, and compares a time counter to a time control value. 22. The system of claim 21 wherein the pressure sensing element is in fluid communication with fuel tank vapor. 23. The system of claim 21 wherein the temperature sensing element is in thermal contact with fuel tank vapor. 24. The system of claim 21 wherein the processor is in communication with the pressure sensing element and the temperature sensing element. 25. The system of claim 21 wherein the processor compares the temperature differential to a temperature control value and compares the pressure differential to a pressure control value. 26. The system of claim 21 wherein the temperature sensing element comprises a te mperature sensor mounted on a fuel tank. 27. The system of claim 21 wherein the pressure sensing element comprises a switch that moves at a given relative vacuum. 28. The system of claim 21 wherein the pressure sensing element comprises a pair of switches that move at different relative vacuums having a low vacuum threshold. 29. The system of claim 21 wherein the pressure sensing element comprises a differential tank pressure sensor located on a conduit between a fuel tank and a canister. 30. The system of claim 21 wherein the temperature sensing element comprises a transducer that supplies differential temperature. 31. The system of claim 21 wherein the temperature sensing element comprises a model based on induction air temperature and engine coolant temperature with a statistical treatment. 32. The system of claim 21 wherein the temperature sensing element and pressure sensing element are located within a vacuum detection component, having a shut off valve, operatively coupled to the processor. 33. The system of claim 21 further comprising: a fuel tank communicating with an engine, the temperature sensing element mounted on the fuel tank; a canister communicating with the fuel tank, the engine and an atmosphere, the pressure sensing element located between the fuel tank and the canister; a shut off valve operatively coupled to the processor and located between the canister and the atmosphere; and a control valve operatively coupled to the processor and located between the canister and the engine; wherein the processor opens and closes the shut off valve and the control valve. 34. An automotive evaporative leak detection system comprising: a differential tank pressure sensor located on a conduit between a fuel tank and a canister, the canister communicating with an engine and an atmosphere, the fuel tank communicating with the engine; a temperature sensor mounted on the fuel tank; a shut off valve located between the canister and the atmosphere; a control valve located between the canister and the engine; and a processor operatively coupled to the shut off valve, the control valve, the pressure sensor and the temperature sensor, the processor receiving pressure and temperature signals from the pressure and temperature sensors, respectively; wherein the processor opens and closes the shut off valve and control valve, calculates a temperature differential between a start temperature and an evaluation temperature, increments a time counter, computes a pressure differential between a start pressure and an evaluation pressure, and then compares the time counter to a time control value if the pressure differential is not greater than a pressure control value.
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