US5289683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for controlling supercharging pressure in an automotive engine
Assignee: Subaru Corp
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Filing: 1993-07-01
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Granted: 1994-03-01
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Expires: 2013-07-01
Abstract
Abstract An automotive engine has a turbocharger, a wastegate valve for controlling flow rate of exhaust gas applied to a turbine of the turbocharger, and an actuator for controlling the wastegate valve. A standard supercharging pressure is determined dependent on characteristics of the wastegate valve, and a desired supercharging pressure is set in accordance with engine operating conditions. A difference between the desired supercharging pressure and the standard supercharging pressure is calculated, and a ratio of the difference to a detected actual supercharging pressure is calculated. From the calculated ratio, a control value applied to the actuator is calculated.
Inventors
- 👤 Masaru Kurihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:06
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/0002; F02D41/0007; F02B; F02B37/00; F02B37/12; F02B37/18; F02B37/183; F02B37/186; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
118 words
A method for controlling supercharging pressure in an automotive engine having a turbocharger, a wastegate valve for controlling a flow rate of exhaust gas applied to a turbine of the turbocharger, and an actuator for controlling the wastegate valve, comprising the steps of: setting a standard supercharging pressure dependent on characteristics of the wastegate valve; setting a desired supercharging pressure in accordance with engine operating conditions; calculating a difference between the desired supercharging pressure and the standard supercharging pressure; detecting an actual supercharging pressure; calculating a ratio of said difference to a detected actual supercharging pressure; and calculating a control value applied to the actuator based on said calculated ratio so as to smoothly control said supercharging pressure.
Claim 2
Independent Claim
118 words
A method for controlling supercharging pressure in an automotive engine having a turbocharger, a wastegate valve for controlling a flow rate of exhaust gas applied to a turbine of the turbocharger, and an actuator for controlling the wastegate valve, comprising the steps of: setting a standard supercharging pressure dependent on characteristics of the wastegate valve; setting a desired supercharging pressure in accordance with engine operating conditions; calculating a difference between the desired supercharging pressure and the standard supercharging pressure; detecting an actual supercharging pressure; calculating a ratio of said difference to a detected actual supercharging pressure; and calculating a control value applied to the actuator based on said calculated ratio so as to smoothly control said supercharging pressure.
Claim 3
Dependent Claim
36 words
The method according to claim 1, wherein the actuator is operated by intake air pressure controlled by a solenoid operated valve, the control value is a duty ratio of pulses for operating the solenoid operated valve.
Claim 4
Independent Claim
106 words
A method of controlling supercharging pressure in an automotive engine having a turbocharger, a wastegate valve for controlling flow rate of exhaust gas applied to a turbine of the turbocharger, and an actuator for controlling the waste gate valve, comprising the steps of: setting a standard supercharging pressure dependent on characteristics of the wastegate valve; setting a desired supercharging pressure in accordance with engine operating conditions; calculating a control value applied to the actuator with the following equation, k·Ps/P-(k-1+Po/P) where k is a supercharging pressure response coefficient, Ps is a desired supercharging pressure, Po is a standard supercharging pressure, and P is an actual supercharging pressure.
Claim 5
Independent Claim
106 words
A method of controlling supercharging pressure in an automotive engine having a turbocharger, a wastegate valve for controlling flow rate of exhaust gas applied to a turbine of the turbocharger, and an actuator for controlling the waste gate valve, comprising the steps of: setting a standard supercharging pressure dependent on characteristics of the wastegate valve; setting a desired supercharging pressure in accordance with engine operating conditions; calculating a control value applied to the actuator with the following equation, k·Ps/P-(k-1+Po/P) where k is a supercharging pressure response coefficient, Ps is a desired supercharging pressure, Po is a standard supercharging pressure, and P is an actual supercharging pressure.
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