Engine control device and engine control method
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02D-041/22
F02D-031/00
F02P-011/02
F02P-009/00
출원번호
US-0729241
(2012-12-28)
등록번호
US-9175618
(2015-11-03)
우선권정보
JP-2011-288662 (2011-12-28)
발명자
/ 주소
Uchiyama, Takahiro
Nagumo, Tomoo
Tsutsumi, Kenichi
Otake, Hiroaki
출원인 / 주소
SUZUKI MOTOR CORPORATION
대리인 / 주소
Barnes & Thornburg LLP
인용정보
피인용 횟수 :
0인용 특허 :
5
초록▼
An engine of a vehicle is provided with an engine control device including an idle speed control (ISC) device provided for an intake bypass passage connecting an upper side and a lower side of a throttle valve installed in an intake passage so as to control an idle speed of the engine by adjusting a
An engine of a vehicle is provided with an engine control device including an idle speed control (ISC) device provided for an intake bypass passage connecting an upper side and a lower side of a throttle valve installed in an intake passage so as to control an idle speed of the engine by adjusting an amount of air flowing through the intake bypass passage at a time of idling of the engine. The engine control device includes a throttle opening degree sensor disposed in the intake passage and configured to detect a degree of opening of the throttle valve, an intake pressure sensor disposed in the intake passage and configured to detect an intake negative pressure at the lower side of the throttle valve, and a control unit configured to control an output of the engine. The control unit is configured to perform an engine output suppression control of suppressing the output of the engine after determining that an ISC valve of the ISC device is abnormal in a case where the degree of opening of the throttle valve detected by the throttle opening degree sensor is within a predetermined range and when the intake negative pressure detected by the intake pressure sensor is low compared with a threshold value.
대표청구항▼
1. An engine control device of an engine including an idle speed control (ISC) device provided for an intake bypass passage connecting an upper side and a lower side of a throttle valve installed in an intake passage so as to control an idle speed of the engine by adjusting an amount of air flowing
1. An engine control device of an engine including an idle speed control (ISC) device provided for an intake bypass passage connecting an upper side and a lower side of a throttle valve installed in an intake passage so as to control an idle speed of the engine by adjusting an amount of air flowing through the intake bypass passage at a time of idling of the engine, the engine control device comprising: a throttle opening degree sensor disposed in the intake passage and configured to detect a degree of opening of the throttle valve;an intake pressure sensor disposed in the intake passage and configured to detect an intake negative pressure at the lower side of the throttle valve; anda control unit configured to control an output of the engine,wherein the control unit is configured to perform engine output suppression control by suppressing the output of the engine after determining that an ISC valve of the ISC device is abnormal based on the degree of opening of the throttle valve detected by the throttle opening degree sensor being within a predetermined range, the intake negative pressure detected by the intake pressure sensor being lower than a threshold value, detection of an increase in engine speed that is more than a first predetermined amount within a predetermined time during a first engine speed increase determination step, and detection of an increase in engine speed that is more than a second predetermined amount within a second predetermined time, wherein the second predetermined time is longer than the first predetermined time. 2. The engine control device according to claim 1, wherein the control unit is configured to compare the intake negative pressure detected by the intake pressure sensor with the threshold value, wherein the intake negative pressure is detected when the degree of opening of the throttle valve detected by the throttle opening degree sensor is within a predetermined range indicating a completely closed region and the engine speed is at a predetermined value or higher after an increase in the engine speed by a predetermined amount or more is detected within a predetermined time. 3. The engine control device according to claim 2, wherein the predetermined value of the engine speed is set to be higher than an idle speed of the engine when the ISC valve is normal, and lower than the engine speed at a time of engagement of an automatic centrifugal clutch. 4. The engine control device according to claim 2, wherein a step of detecting whether or not there is an increase in the engine speed by the predetermined amount or more within the predetermined time is a step of sequentially performing the first engine speed increase determination and the second engine speed increase determination. 5. The engine control device according to claim 1, wherein the engine output suppression control is an ignition thinning out control of performing ignition of only a given number of cycles among a plurality of successive cycles of the engine. 6. The engine control device according to claim 1, wherein the control unit is configured to perform the engine output suppression control after a specific time has elapsed after an abnormality of the ISC valve has been determined. 7. The engine control device according to claim 1, wherein a plurality of threshold values for the intake negative pressure differ from each other depending on the degree of opening of the ISC valve at a time of fixation of the ISC valve, and the control unit is configured to perform different engine output suppression controls respectively correspondingly to the plurality of threshold values. 8. The engine control device according to claim 1, wherein the control unit is configured to, at a time when a predetermined condition is satisfied, recognize a property of the intake pressure sensor based on a detected value of the intake negative pressure detected by the intake pressure sensor in a predetermined engine operation state, and perform an intake pressure sensor learning control of performing learning so as to correct, based on the recognized property, the detected value of the intake negative pressure detected by the intake pressure sensor. 9. The engine control device according to claim 8, wherein the satisfaction time of the predetermined condition is a satisfaction time of a condition indicating that a vehicle on which the engine is mounted is in a maintenance state, and the intake pressure sensor learning control is performed at a time of the maintenance. 10. The engine control device according to claim 9, wherein the control unit is configured to recognize the maintenance state of the vehicle by detecting a connected state of a maintenance terminal for plugging in a tool that is used at a time of the maintenance of the vehicle. 11. The engine control device according to claim 8, wherein the predetermined engine operation state is a state in which all of a state where an indicator indicating a warm-up state of the engine indicates that the engine is in a warmed-up state, a state where the throttle valve is in a substantially completely closed state, a state where the engine speed is in a stable idling state, and a state where each of the states has been continuing for a predetermined time, are satisfied. 12. The engine control device according to claim 11, wherein continuance, over a predetermined time, of a state where the intake negative pressure is within a predetermined range with respect to a set value for idling of the engine is added to the predetermined engine operation state. 13. The engine control device according to claim 11, wherein continuance, over a predetermined time, of a state where a vehicle speed is at a predetermined value or lower is added to the predetermined engine operation state. 14. An engine control method of an engine including an idle speed control (ISC) valve provided for an intake bypass passage connecting an upper side and a lower side of a throttle valve installed in an intake passage and that controls an idle speed of the engine by adjusting an amount of air flowing through the intake bypass passage at a time of idling of the engine, wherein an engine output suppression control of suppressing an output of the engine is performed after determining that the ISC valve is abnormal based on a degree of opening of the throttle valve being within a predetermined range, an intake negative pressure at the lower side of the throttle valve in the intake passage being lower then a threshold value, detection of an increase in engine speed that is more than a first predetermined amount within a predetermined time during a first engine speed increase determination step, and detection of an increase in engine speed that is more than a second predetermined amount within a second predetermined time, wherein the second predetermined time is longer than the first predetermined time.
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이 특허에 인용된 특허 (5)
Ohsaki Masanobu,JPX ; Fujimoto Michiyuki,JPX ; Ohtani Seiichi,JPX ; Shiobara Katsuyoshi,JPX, Diagnostic apparatus and method for supplying assist air in an internal combustion engine.
Ota, Tomohiko, Vehicle, controller and control method therefor, and abnormality detection system for idle speed control device and abnormality determining method for idle speed control device.
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