Throttle control device for internal combustion engine and throttle control method for internal combustion engine
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02D-023/00
F02D-041/00
F02B-037/12
F02B-037/22
F02D-041/12
F02B-037/18
출원번호
US-0454303
(2014-08-07)
등록번호
US-9541016
(2017-01-10)
우선권정보
JP-2014-077699 (2014-04-04)
발명자
/ 주소
Hashimoto, Takeshi
출원인 / 주소
Mitsubishi Electric Corporation
대리인 / 주소
Sughrue Mion, PLLC
인용정보
피인용 횟수 :
0인용 특허 :
3
초록▼
Provided are a throttle control device for an internal combustion engine and a throttle control method for an internal combustion engine, which are capable of avoiding occurrence of overshoot of a supercharging pressure at the time of deceleration to improve durability of components in an engine equ
Provided are a throttle control device for an internal combustion engine and a throttle control method for an internal combustion engine, which are capable of avoiding occurrence of overshoot of a supercharging pressure at the time of deceleration to improve durability of components in an engine equipped with a supercharger. The engine equipped with the supercharger includes a bypass passage which bypasses a turbine of the supercharger. In the bypass passage, a wastegate valve for adjusting a flow-path area of the bypass passage by a wastegate actuator is provided. An ECU (50) increases the flow-path area of the wastegate valve for deceleration to be started during a high-load operation and closes a throttle valve after confirming that a throttle-valve upstream pressure becomes lower than a predetermined value. As a result, the overshoot of the throttle-valve upstream pressure can be avoided reliably.
대표청구항▼
1. A throttle control device for an internal combustion engine, comprising: a supercharger comprising a throttle valve provided in an intake path for the internal combustion engine, a turbine provided in an exhaust path, and a compressor provided upstream of the throttle valve so as to rotate integr
1. A throttle control device for an internal combustion engine, comprising: a supercharger comprising a throttle valve provided in an intake path for the internal combustion engine, a turbine provided in an exhaust path, and a compressor provided upstream of the throttle valve so as to rotate integrally with the turbine;a throttle motor for driving the throttle valve to change a flow-path sectional area of the intake path;a wastegate valve provided in a bypass passage which bypasses the turbine;a wastegate valve actuator for driving the wastegate valve to change a flow-path sectional area of the bypass passage;a throttle-valve upstream pressure detecting section for detecting, as a throttle-valve upstream pressure, a pressure in the intake path between a portion located downstream of the supercharger and a portion at which the throttle valve is provided;an accelerator position sensor for detecting an accelerator opening amount; andan electronic control unit for controlling the wastegate valve and the throttle valve in accordance with a current operating state,the electronic control unit being configured to: determine whether the current operating state is a high-load operation by comparing the throttle-valve upstream pressure detected by the throttle-valve upstream pressure detecting section with a predefined threshold pressure and by comparing the accelerator opening amount detected by the accelerator position sensor with a predefined first threshold opening amount;when the throttle-valve upstream pressure detected by the throttle-valve upstream pressure detecting section is equal to or larger than the predefined threshold pressure and the accelerator opening amount detected by the accelerator position sensor is equal to or larger than the predefined first threshold opening amount, determine that the current operating state is the high-load operation;in response to the determination that the current operating state is the high-load operation, determine whether the throttle valve is closed during the high-load operation and whether the current operating state enters a deceleration operation region by comparing the accelerator opening amount detected by the accelerator position sensor with a predefined second threshold opening amount that a value smaller than the first threshold opening amount;when the accelerator opening amount detected by the accelerator position sensor is equal to or smaller than the predefined second threshold opening amount, determine that the current operating state enters the deceleration operation region during the high-load operation;in response to the determination that that the current operating state enters the deceleration operation region during the high-load operation, control the wastegate valve actuator to fully open the wastegate valve and control the throttle motor to fully open the throttle valve;in response to the wastegate valve actuator fully opening the wastegate valve and the throttle motor fully opening the throttle valve, compare the throttle-valve upstream pressure detected by the throttle-valve upstream pressure detecting section with the predefined threshold pressure; andwhen the throttle-valve upstream pressure detected by the throttle-valve upstream pressure detecting section becomes lower than the predefined threshold pressure, control the throttle motor to fully close the throttle valve. 2. A throttle control device for an internal combustion engine according to claim 1, wherein, when the accelerator opening amount detected by the accelerator position sensor is equal to or smaller than the predefined second threshold opening amount, the electronic control unit is further configured to control the throttle motor to fully close the throttle valve when a duration of a state in which the throttle-valve upstream pressure is equal to or larger than the predefined threshold pressure exceeds a predetermined time period after the throttle valve is fully opened based on the determination that the throttle valve is closed during the high-load operation and that the current operating state enters the deceleration operation region. 3. A throttle control method for an internal combustion engine to be executed by an electronic control unit included in a throttle control device for an internal combustion engine, the throttle control device comprising: a supercharger comprising a throttle valve provided in an intake path for the internal combustion engine, a turbine provided in an exhaust path, and a compressor provided upstream of the throttle valve so as to rotate integrally with the turbine;a throttle motor for driving the throttle valve to change a flow-path sectional area of the bypass passage;a wastegate valve provided in a bypass passage which bypasses the turbine;a wastegate valve actuator for driving the wastegate valve to change a flow-path sectional area of the bypass passage;a throttle-valve upstream pressure detecting section for detecting, as a throttle-valve upstream pressure, a pressure in the intake path between a portion located downstream of the supercharger and a portion at which the throttle valve is provided;an accelerator position sensor for detecting an accelerator opening amount; andthe electronic control unit for controlling the wastegate valve and the throttle valve in accordance with a current operating state,the throttle control method comprising: determining, by the electronic control unit, whether the current operating state is a high-load operation by comparing the throttle-valve upstream pressure detected by the throttle-valve upstream pressure detecting section with a predefined threshold pressure and by comparing the accelerator opening amount detected by the accelerator position sensor with a predefined first threshold opening amount;determining, by the electronic control unit, when the throttle-valve upstream pressure detected by the throttle-valve upstream pressure detecting section is equal to or larger than the predefined threshold pressure and the accelerator opening amount detected by the accelerator position sensor is equal to or larger than the predefined first threshold opening amount, that the current operating state is the high-load operation;determining, by the electronic control unit, in response to the determination that the current operating state is the high-load operation, whether the throttle valve is closed during the high-load operation and whether the current operating state enters a deceleration operation region by comparing the accelerator opening amount detected by the accelerator position senor with a predefined second threshold opening amount this is a value smaller than the first threshold opening amount;determining, by the electronic control unit, when the accelerator opening amount detected by the accelerator position sensor is equal to or smaller than the predefined second threshold opening amount, that the current operating state enters the deceleration operation region during the high-load operation;controlling, by the electronic control unit, in response to the determination that the current operating state enters the deceleration operation region during the high-load operation, the wastegate valve actuator to fully open the wastegate valve and controlling, by the electronic control unit, the throttle motor to fully open the throttle valve;comparing, by the electronic control unit, in response to the wastegate valve actuator fully opening the wastegate valve and the throttle motor fully opening the throttle valve, the throttle-valve upstream pressure detected by the throttle-valve upstream pressure detecting section with the predefined threshold pressure; andcontrolling, by the electronic control unit, when the throttle-valve upstream pressure detected by the throttle-valve upstream pressure detecting section becomes lower than the predefined threshold pressure, the throttle motor to fully close the throttle valve.
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이 특허에 인용된 특허 (3)
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