CONTROL APPARATUS FOR INTERNAL COMBUSTION ENGINE

• US 20160076438A1
• Filed: 09/09/2015
• Published: 03/17/2016
• Est. Priority Date: 09/11/2014
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Tabata, Masakazu, Tomita, Sho
• Granted Patent: US 10,006,350 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F02B 33/40 of non-positive-displacement type
• CPC Class Codes: F02B 37/04 Engines with exhaust drive and other drive of pumps, e.g. with exhaust-driven pump and mechanically-driven second pump
• CPC Class Codes: F02B 37/14 Control of the alternation between or the operation of exhaust drive and other drive of a pump, e.g. dependent on speed
• CPC Class Codes: F02B 37/18 by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
• CPC Class Codes: F02B 37/186 Arrangements of actuators or linkage for bypass valves
• 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 39/10 electric
• CPC Class Codes: F02D 2200/101 Engine speed
• CPC Class Codes: F02D 2250/18 Control of the engine output torque
• CPC Class Codes: F02D 23/00 Controlling engines characterised by their being supercharged
• CPC Class Codes: F02D 37/02 one of the functions being ignition
• 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 41/1446 the characteristics being exhaust temperatures
• CPC Class Codes: F02D 41/1448 the characteristics being an exhaust gas pressure
• CPC Class Codes: F02M 26/00 Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
• CPC Class Codes: F02M 26/01 Internal exhaust gas recirculation, i.e. wherein the residual exhaust gases are trapped in the cylinder or pushed back from the intake or the exhaust manifold into the combustion chamber without the use of additional passages
• CPC Class Codes: F02P 5/045 combined with electronic control of other engine functions, e.g. fuel injection in general F02D37/02
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

A control apparatus is provided for an internal combustion engine that includes a turbosupercharger, an electric supercharger, and a waste gate valve configured to open and close an exhaust bypass passage. In a single-supercharging range in which an engine torque is less than a torque boundary value TQ2, a WGV opening degree is controlled so as to decrease accompanying an increase in the engine torque. Further, in a twin-supercharging range in which the engine torque is equal to or greater than the torque boundary value TQ2, the WGV opening degree is controlled so as to increase accompanying an increase in the engine torque, and the electric motor 24b is actuated for supercharging.

Claims

1. A control apparatus for an internal combustion engine that includes:

a turbosupercharger configured to supercharge intake air by utilizing exhaust energy that is recovered by a turbine disposed in an exhaust passage of the internal combustion engine as a power source;

an electric supercharger configured to supercharge intake air by utilizing an electric motor as a power source;

an exhaust bypass passage that bypasses the turbine; and

a waste gate valve configured to open and close the exhaust bypass passage,

the control apparatus comprising;

a controller, the controller configured to;

control an opening degree of the waste gate valve so that, in a first torque index value range in which a torque index value that has a correlation with an engine torque is less than a first boundary value, the opening degree of the waste gate valve decreases accompanying an increase in the engine torque;

control the opening degree of the waste gate valve so that, in an increase range that is included in a second torque index value range in which the torque index value is equal to or greater than the first boundary value, the opening degree of the waste gate valve increases accompanying an increase in the engine torque; and

actuate the electric motor for supercharging in the second torque index value range.

2. The control apparatus according to claim 1,

wherein the controller is configured to take all of the second torque index value range as the increase range and control the opening degree of the waste gate valve so that the opening degree of the waste gate valve increases accompanying an increase in the engine torque.

3. The control apparatus according to claim 1,

wherein the second torque index value range includes a constant range in which the torque index value is equal to or greater than the first boundary value and is less than a second boundary value, and the increase range as a torque index value range in which the torque index value is equal to or greater than the second boundary value,

wherein, in the constant range, the controller is configured to control the opening degree of the waste gate valve so that the opening degree of the waste gate valve is kept constant or substantially constant with respect to a change in the engine torque,

wherein the first boundary value is a torque index value that is lower than an upper limit of a torque index value that is determined by a constraint of a predetermined parameter under a non-motor assisted supercharging mode that is not accompanied by supercharging that adopts the electric motor as a power source, and

wherein the opening degree of the waste gate valve in the constant range is greater than the opening degree of the waste gate valve when the torque index value is the upper limit value in the non-motor assisted supercharging mode.

4. The control apparatus according to claim 3,

wherein the controller is configured to advance an ignition timing in a case where a motor assisted supercharging mode that is accompanied by supercharging that adopts the electric motor as a power source is available in a third torque index value range from the first boundary value to the upper limit value, compared to an ignition timing in a case where the non-motor assisted supercharging mode is used in the third torque index value range as a result of utilization of the motor assisted supercharging mode being restricted.

5. The control apparatus according to claim 1,

wherein a lower limit of the increase range is set based on an exhaust gas temperature.

6. The control apparatus according to claim 1,

wherein a lower limit of the increase range is set based on an exhaust gas pressure upstream of the turbine.

7. The control apparatus according to claim 1,

wherein a lower limit of the increase range is set based on a pumping loss of the internal combustion engine.

8. The control apparatus according to claim 1,

wherein the first boundary value decreases as an engine speed increases.

9. A control apparatus for an internal combustion engine that includes:

an electric-motor-assisted turbosupercharger configured to supercharge intake air by utilizing exhaust energy that is recovered by a turbine disposed in an exhaust passage of the internal combustion engine and utilizing an electric motor as power sources;

an exhaust bypass passage that bypasses the turbine; and

a waste gate valve configured to open and close the exhaust bypass passage,

the control apparatus comprising;

a controller, the controller configured to;

control an opening degree of the waste gate valve so that, in a first torque index value range in which a torque index value that has a correlation with an engine torque is less than a first boundary value, the opening degree of the waste gate valve decreases accompanying an increase in the engine torque;

control the opening degree of the waste gate valve so that, in an increase range that is included in a second torque index value range in which the torque index value is equal to or greater than the first boundary value, the opening degree of the waste gate valve increases accompanying an increase in the engine torque; and

actuate the electric motor for supercharging in the second torque index value range.

10. The control apparatus according to claim 9,

wherein the controller is configured to take all of the second torque index value range as the increase range and control the opening degree of the waste gate valve so that the opening degree of the waste gate valve increases accompanying an increase in the engine torque.

11. The control apparatus according to claim 9,

wherein the second torque index value range includes a constant range in which the torque index value is equal to or greater than the first boundary value and is less than a second boundary value, and the increase range as a torque index value range in which the torque index value is equal to or greater than the second boundary value,

wherein, in the constant range, the controller is configured to control the opening degree of the waste gate valve so that the opening degree of the waste gate valve is kept constant or substantially constant with respect to a change in the engine torque,

wherein the first boundary value is a torque index value that is lower than an upper limit of a torque index value that is determined by a constraint of a predetermined parameter under a non-motor assisted supercharging mode that is not accompanied by supercharging that adopts the electric motor as a power source, and

wherein the opening degree of the waste gate valve in the constant range is greater than the opening degree of the waste gate valve when the torque index value is the upper limit value in the non-motor assisted supercharging mode.

12. The control apparatus according to claim 11,

wherein the controller is configured to advance an ignition timing in a case where a motor assisted supercharging mode that is accompanied by supercharging that adopts the electric motor as a power source is available in a third torque index value range from the first boundary value to the upper limit value, compared to an ignition timing in a case where the non-motor assisted supercharging mode is used in the third torque index value range as a result of utilization of the motor assisted supercharging mode being restricted.

13. The control apparatus according to claim 9,

wherein a lower limit of the increase range is set based on an exhaust gas temperature.

14. The control apparatus according to claim 9,

wherein a lower limit of the increase range is set based on an exhaust gas pressure upstream of the turbine.

15. The control apparatus according to claim 9,

wherein a lower limit of the increase range is set based on a pumping loss of the internal combustion engine.

16. The control apparatus according to claim 9,

wherein the first boundary value decreases as an engine speed increases.