EP0040814A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Control system for exhaust gas-driven supercharger used in vehicle engine
Assignee: Hitachi Ltd
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Filing: 1981-05-20
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Granted: —
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Expires: 2001-05-20
Abstract
Abstract A system for controlling an exhaust gasdriven supercharger used in an internal combustion engine for an automotive vehicle includes an exhaust gas bypass passage (48) connecting between selected portions of the exhaust gas conduit upstream and downstream of a turbine (44) of the supercharger (42), and an exhaust bypass valve (50) disposed midway of the exhaust gas bypass passage (48) for controlling the quantity of engine exhaust gases. In the supercharger control system, an actuator (52) responsive to a digital control signal is employed for actuating the exhaust bypass valve (50). A microcomputer (100) calculates the opening of the exhaust bypass valve (50) so that the supercharged air pressure may not exceed the critical point giving rise to knocking, and such a digital control output signal is applied to energize the actuator (52) so that the supercharged air pressure can be controlled with highest efficiency over a wide operation range of the engine.
Inventors
- 👤 Satoshi Suzuki
- 👤 Hiroyuki Ando
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 09:53
CPC Classifications
F; F02; F02B; F02B37/00; F02B37/12; F02B37/18; F02B37/183; F02B37/186; F02D; F02D35/00; F02D35/02; F02D35/027; F02D41/00; F02D41/0002; F02D41/0007; F02D41/24; F02D41/26; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
330 words
A system for controlling an exhaust gas-driven supercharger used in an internal combustion engine for an automotive vehicle including a turbine (44) disposed in an exhaust gas passage of the engine to be driven by the stream of exhaust gases. discharged from the combustion chambers of said engine into. said exhaust gas passage, a supercharging compres.sor (46) disposed in an intake air passage of said engine to be driven by said turbine, an exhaust gas bypass passage (48) connecting between selected portions of said exhaust gas passage upstream and downsttream of said turbine, and an exhaust bypass valve (50) disposed midway of said exhaust gas bypass passage for regulating the quantity of exhaust gases flowing through said exhaust gas bypass passage, said control system comprising a plurality of electrical signal generating means (20, 30, 34,. 36) for generating electrical signals indicative of the operating condition of said engine, knocking signal generating means (32) for sensing the presence or absence of knocking in said engine and generating an electrical signal indicative of occurrence of knocking when knocking is present, control circuit means (100) including memory means (104) for storing a series of basic data of the controlled opening of said exhaust bypass valve (50) corresponding to various operating conditions of said engine, said control circuit means (100) reading out from said memory means (104) a basic data of the controlled opening of said exhaust bypass valve (50). on the basis of the electrical signals generated from said electrical signal generating means (20, 30,. 34, 36) and, when said knocking signal generating means (32) senses occurrence of knocking and generates the electrical signal indicative of occurrence of knocking, modifying the basic data of the controlled opening thereby generating a corresponding digital output signal so as to provide a modified supercharged air pressure at which knocking does not occur, and actuator means (52) for actuating said exhaust bypass valve (50) in response to the digital signal applied from said control circuit means (100).
Claim 2
Independent Claim
330 words
A system for controlling an exhaust gas-driven supercharger used in an internal combustion engine for an automotive vehicle including a turbine (44) disposed in an exhaust gas passage of the engine to be driven by the stream of exhaust gases. discharged from the combustion chambers of said engine into. said exhaust gas passage, a supercharging compres.sor (46) disposed in an intake air passage of said engine to be driven by said turbine, an exhaust gas bypass passage (48) connecting between selected portions of said exhaust gas passage upstream and downsttream of said turbine, and an exhaust bypass valve (50) disposed midway of said exhaust gas bypass passage for regulating the quantity of exhaust gases flowing through said exhaust gas bypass passage, said control system comprising a plurality of electrical signal generating means (20, 30, 34,. 36) for generating electrical signals indicative of the operating condition of said engine, knocking signal generating means (32) for sensing the presence or absence of knocking in said engine and generating an electrical signal indicative of occurrence of knocking when knocking is present, control circuit means (100) including memory means (104) for storing a series of basic data of the controlled opening of said exhaust bypass valve (50) corresponding to various operating conditions of said engine, said control circuit means (100) reading out from said memory means (104) a basic data of the controlled opening of said exhaust bypass valve (50). on the basis of the electrical signals generated from said electrical signal generating means (20, 30,. 34, 36) and, when said knocking signal generating means (32) senses occurrence of knocking and generates the electrical signal indicative of occurrence of knocking, modifying the basic data of the controlled opening thereby generating a corresponding digital output signal so as to provide a modified supercharged air pressure at which knocking does not occur, and actuator means (52) for actuating said exhaust bypass valve (50) in response to the digital signal applied from said control circuit means (100).
Claim 3
Dependent Claim
82 words
A supercharger control system as claimed in Claim 1, wherein said electrical signal generating means (20,. 30, 34, 36) include signal generators (20, 30) generating an electrical signal indicative of the quantity of intake air supplied to said engine and an electrical signal indicative of the rotation speed of said engine respectively, and said memory means (104) stores the basic data of the controlled opening of said exhaust bypass valve (50) determined by said intake air quantity and said engine rotation speed.
Claim 4
Dependent Claim
56 words
A supercharger control system as claimed in Claim 1, wherein, when said engine is under deceleration, said control circuit means (100) applies to said actuator means (52) a digital signal which acts. to urge said exhaust bypass valve (50) to its full open position and maintain it in that position for a predetermined period of time.
Claim 5
Dependent Claim
63 words
A supercharger control system as claimed in Claim 3, wherein said control circuit means (100) determines that said engine is under deceleration in response to the application of electrical output signals from an idle switch (138) sensing the idle opening of a throttle valve (16) disposed in said intake air passage and a signal generator (134). sensing the rotation speed of said engine.
Claim 6
Dependent Claim
54 words
A supercharger control system as claimed in Claim 1, wherein, when said engine is under acceleration, said control circuit means (100) applies to. said actautor means (52) a digital signal which urges said exhaust bypass valve (50) to its. full closed position and maintain it in that position for a predetermined period of time.
Claim 7
Dependent Claim
67 words
A supercharger control system as claimed in claim 5, wherein the on-duty of the digital signal applied from said control circuit means (100.) to said actuator means (52) for maintaining said exhaust bypass valve (50) in its full closed position is determined depending on the degree of acceleration and is so controlled by said control circuit means (100) that the greater the acceleration, the on-duty is longer.
Claim 8
Dependent Claim
51 words
A supercharger control system as claimed in Claim 6, wherein said control circuit means (100) judges the degree of acceleration on the basis of the rate of change of an electrical output signal generated from a signal generator (20) generating an electrical output signal indicative of the quatnity of intake air.
Claim 9
Dependent Claim
70 words
A supercharger control system as claimed in Claim 1, wherein, when said knocking signal generating means (32) is not generating its electrical output signal indicative of occurrence of knocking, said control circuit means (100) generates such a digital output signal that the basic data of the controlled opening of said exhaust bypass valve (50) stored in said memory means (104) is further modified to. provide a higher supercharged air pressure.
Claim 10
Dependent Claim
36 words
A supercharger control system as claimed in Claim 1, wherein said actuator means (52) is an electrically energized actuator which is directly coupled to said exhaust bypass valve (50) for causing interlocking operation of the latter.
Claim 11
Dependent Claim
28 words
A supercharger control system as claimed in Claim 9, wherein a controlled on-duty signal is applied from said control circuit means (100) to said electrically energized actuator (52).
References Cited (Backward Citations)
No citation records indexed.
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