Control of supercharger

• US 6,658,847 B2
• Filed: 03/29/2002
• Issued: 12/09/2003
• Est. Priority Date: 10/05/2000
• Status: Active Grant

• Current Assignee: Nissan Motor Co., Ltd.
• Original Assignee: Nissan Motor Co., Ltd.
• Inventors: Shirakawa, Takashi
• Primary Examiner(s): NGUYEN, HOANG M
• Application Number:
  US10/089,502
• Publication Number:
  US 20030051474A1
• Time in Patent Office: 620 Days
• Field of Search: 606/02, 606/051, 606/052, 606/14, 606/15, 606/00, 606/03
• US Class Current: 60/602
• CPC Class Codes: F02B 37/22 by varying cross-section of exhaust passages or air passages , e.g. by throttling turbine inlets or outlets or by varying effective number of guide conduits F02B37/24 takes precedence
• CPC Class Codes: F02B 37/24 by using pumps or turbines with adjustable guide vanes
• CPC Class Codes: F02D 2041/1409 using at least a proportional, integral or derivative controller
• CPC Class Codes: F02D 2041/141 using a feed-forward control element
• CPC Class Codes: F02D 2041/1422 Variable gain or coefficients
• CPC Class Codes: F02D 2041/1431 the system including an input-output delay
• CPC Class Codes: F02D 2041/1432 the system including a filter, e.g. a low pass or high pass filter
• CPC Class Codes: F02D 2200/0414 Air temperature
• CPC Class Codes: F02D 2200/602 Pedal position
• CPC Class Codes: F02D 2200/703 Atmospheric pressure
• CPC Class Codes: F02D 41/0007 for control of turbo-charged or super-charged engines control of the pumps per se F02B37/12
• CPC Class Codes: F02D 41/0065 Specific aspects of external EGR control constructional details of EGR system F02M26/00
• CPC Class Codes: F02D 41/1454 the characteristics being an oxygen content or concentration or the air-fuel ratio
• CPC Class Codes: F02D 41/2441 characterised by the learning conditions
• CPC Class Codes: F02D 41/2451 characterised by what is learned or calibrated
• CPC Class Codes: F02M 26/05 High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
• CPC Class Codes: F02M 26/10 having means to increase the pressure difference between the exhaust and intake system, e.g. venturis, variable geometry turbines, check valves using pressure pulsations or throttles in the air intake or exhaust system
• CPC Class Codes: F02M 26/16 with EGR valves located at or near the connection to the exhaust system
• CPC Class Codes: F02M 26/22 with coolers in the recirculation passage
• CPC Class Codes: F02M 26/23 Layout, e.g. schematics
• CPC Class Codes: F02M 26/28 : with liquid-cooled heat exchangers
• CPC Class Codes: F02M 26/33 : controlling the temperature of the recirculated gases
• CPC Class Codes: F02M 26/47 : the characteristics being temperatures, pressures or flow rates
• CPC Class Codes: F02M 26/57 : using electronic means, e.g. electromagnetic valves
• CPC Class Codes: F02M 47/027 : Electrically actuated valves draining the chamber to release the closing pressure
• CPC Class Codes: F02M 59/366 : Valves being actuated electrically
• CPC Class Codes: F02M 63/0225 : Fuel-injection apparatus having a common rail feeding several injectors F02M63/0003 takes precedence; Means for varying pressure in common rails; Pumps feeding common rails
• CPC Class Codes: Y02T 10/12 : Improving ICE efficiencies

Abstract

An engine is provided with a turbocharger which varies a supercharging pressure by an actuator. A controller calculates a first compensation value of a response delay from operation of the actuator to variation of an intake air amount of the engine, and a second compensation value of an operating delay of the actuator with respect to an input of a command signal to the actuator. The command signal to the actuator is calculated by performing a processing based on the first compensation and the second compensation value on an operational target value that was determined based on the running state of the engine, and the response of intake air amount control is thereby enhanced.

Claims

1. A control device for a turbocharger of an engine, the turbocharger comprising an actuator which adjusts an intake air amount of the engine according to a command signal, the control device comprising:

a sensor which detects a running state of the engine; and

a controller functioning to;

set a target intake air amount of the engine based on the running state;

calculate an operational target value of the actuator based on the target intake air amount;

calculate a first compensation value of a response delay from operation of the actuator to variation of the intake air amount;

calculate a second compensation value of an operating delay of the actuator with respect to an input of the command signal to the actuator;

calculate the command signal by performing a processing based on the first compensation value and the second compensation value on the operational target value; and

output the command signal to the actuator.

2. The control device as defined in claim 1, wherein the controller is further functioning to perform processing on the operation target value based on the second compensation value after performing processing based on the first compensation value.

3. The control device as defined in claim 1, wherein the control device further comprises a sensor which detects an exhaust gas amount of the engine, and the controller is further functioning to calculate the first compensation value by applying advance processing to the operational target value when the exhaust gas amount of the engine is less than a predetermined amount.

4. The control device as defined in claim 1, wherein the control device further comprises a sensor which detects an exhaust gas amount of the engine, and the controller is further functioning to calculate the first compensation value by applying delay processing to the operational target value when the exhaust gas amount of the engine is larger than a predetermined amount.

5. The control device as defined in claim 1, wherein the control device further comprises a sensor which detects an exhaust gas amount of the engine, the first compensation value includes an advance correction gain, and the controller is further functioning to set the advance correction gain based on the exhaust gas amount of the engine.

6. The control device as defined in claim 5, wherein the controller is further functioning to set the advance correction gain to a positive value less than one when the exhaust gas amount of the engine is greater than a predetermined amount.

7. The control device as defined in claim 5, wherein the controller is further functioning to set the advance correction gain when the actuator is operating in an increasing direction of the intake air amount, larger than the advance correction gain when the actuator is operating in a decreasing direction of the intake air amount.

8. The control device as defined in claim 1, wherein the control device further comprises a sensor which detects an exhaust gas amount of the engine, the first compensation value includes a time constant equivalent value corresponding to the inverse of a time constant of the advance correction, and the controller is further functioning to determine the time constant equivalent value according to the exhaust gas amount of the engine.

9. The control device as defined in claim 8, wherein the controller is further functioning to set the time constant equivalent value when the actuator is operating in an increasing direction of the intake air amount, smaller than the time constant equivalent value when the actuator is operating in a decreasing direction of the intake air amount.

10. The control device as defined in claim 1, wherein the second compensation value includes an advance correction gain related to a response of the actuator and the controller is further functioning to set the advance correction gain when the actuator is operating in an increasing direction of the intake air amount, larger than the advance correction gain when the actuator is driven in a decreasing direction of the intake air amount.

11. the control device as defined in claim 1, wherein the second compensation value includes a time constant equivalent value corresponding to an inverse of a time constant which represents an operation speed of the actuator, and the controller is further functioning to set the time constant equivalent value when the actuator is driven in an increasing direction of the intake air amount, larger than the time constant equivalent value when the actuator is driven in a decreasing direction of the intake air amount.

12. The control device as defined in claim 1, wherein the engine comprises an exhaust gas recirculation device which recirculates part of an exhaust gas into an intake fresh air of the engine, and the controller is further functioning to calculate a target exhaust gas recirculation amount of the exhaust gas recirculation device based on the running state, calculate a first processing value based on the first compensation value, calculate a control target value of the exhaust gas recirculation device based on the operating target value processing value and target exhaust circulation amount, and control the exhaust gas recirculation device based on the control target value.

13. A control device for a turbocharger of an engine, the turbocharger comprising an actuator which adjusts an intake air amount of the engine according to a command signal, the control device comprising:

means for detecting a running state of the engine;

means for setting a target intake air amount of the engine based on the running state;

means for calculating an operational target value of the actuator based on the target intake air amount;

means for calculating a first compensation value of a response delay from operation of the actuator to variation of the intake air amount;

means for calculating a second compensation value of an operating delay of the actuator with respect to an input of the command signal to the actuator;

means for calculating the command signal by performing a processing based on the first compensation value and the second compensation value on the operational target value; and

means for outputting the command signal to the actuator.

14. A control method of a turbocharger of an engine, the turbocharger comprising an actuator which adjusts an intake air amount of the engine according to a command signal, the control method comprising:

detecting a running state of the engine;

setting a target intake air amount of the engine based on the running state;

calculating an operational target value of the actuator based on the target intake air amount;

calculating a first compensation value of a response delay from operation of the actuator to variation of the intake air amount;

calculating a second compensation value of an operating delay of the actuator with respect to an input of the command signal to the actuator;

calculating the command signal by performing a processing based on the first compensation value and the second compensation value on the operational target value; and

outputting the command signal to the actuator.