Engine control systems and methods for future torque request increases

• US 9,920,697 B2
• Filed: 03/26/2014
• Issued: 03/20/2018
• Est. Priority Date: 03/26/2014
• Status: Expired due to Fees

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations LLC (General Motors Company)
• Inventors: Pochner, Klaus, Whitney, Christopher E.
• Primary Examiner(s): Shanske, Jason
• Assistant Examiner(s): Kebea, Jessica
• Application Number:
  US14/225,496
• Publication Number:
  US 20150275771A1
• Time in Patent Office: 1,455 Days
• CPC Class Codes: F02B 37/18 by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
• CPC Class Codes: F02D 11/105 characterised by the function converting demand to actuation, e.g. a map indicating relations between an accelerator pedal position and throttle valve opening or target engine torque
• CPC Class Codes: F02D 2009/0205 working on the throttle valve and another valve, e.g. choke
• CPC Class Codes: F02D 2009/0276 Throttle and EGR-valve operated together
• CPC Class Codes: F02D 2041/002 by simultaneous control of throttle and variable valve actuation
• CPC Class Codes: F02D 2041/1412 using a predictive controller
• CPC Class Codes: F02D 2041/1433 using a model or simulation of the system
• CPC Class Codes: F02D 2200/1004 Estimation of the output torque
• CPC Class Codes: F02D 2200/1006 Engine torque losses, e.g. friction or pumping losses or losses caused by external loads of accessories
• CPC Class Codes: F02D 2200/606 Driving style, e.g. sporty or economic driving
• 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 29/02 peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
• 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 41/0087 Selective cylinder activation, i.e. partial cylinder operation deceleration cut-off F02D41/123
• CPC Class Codes: F02D 41/1406 with use of a optimisation method, e.g. iteration
• CPC Class Codes: F02D 9/02 concerning induction conduits throttle valves, or arrangements thereof in conduits F02D9/08
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

An engine control method includes: generating a torque request for an engine based on a driver input; and based on the torque request, controlling: opening of a wastegate of a turbocharger; opening of a throttle valve based on the torque request; and an intake valve phaser and an exhaust valve phaser. The engine control method also includes selectively determining an expected future increase in the torque request. The engine control method also includes, based on the expected future increase and before the torque request increases based on the expected future increase: decreasing the opening of the wastegate; and at least one of: decreasing the opening of the throttle valve; and adjusting at least one of the intake valve phaser and the exhaust valve phaser to decrease a volumetric efficiency of the engine.

Claims

1. An engine control system of a vehicle, comprising:

a driver torque requesting module that generates a first torque request for an engine in response to an increase in an accelerator pedal position;

a torque requesting module that determines a second torque request based on the first torque request;

a future request module that, based on an expected increase in the first torque request in response to the increase in the accelerator pedal position, selectively sets a future torque request to greater than the second torque request,

an air control module that controls opening of a wastegate of a turbocharger and opening of a throttle valve based on one of the second torque request and the future torque request; and

wherein, based on the future torque request being greater than the second torque request, the air control module decreases the opening of the wastegate and the opening of the throttle valve before the expected increase in the first torque request.

2. The engine control system of claim 1 wherein, after the decrease in the opening of the wastegate and the opening of the throttle valve, the air control module increases the opening of the throttle valve when the first torque request increases in response to the increase in the accelerator pedal position.

3. The engine control system of claim 1 wherein, after the decrease in the opening of the wastegate and the opening of the throttle valve, when the first torque request increases in response to the increase in the accelerator pedal position, the air control module increases the opening of the throttle valve and maintains the opening of the wastegate.

4. The engine control system of claim 1 wherein, the future request module further, based on a second expected increase in the first torque request for engagement of an air conditioning compressor clutch, sets the future torque request to greater than the second torque request.

5. The engine control system of claim 1, wherein the future request module further, based on a second expected increase in the first torque request for a driver selecting a sport mode of operation of the vehicle, sets the future torque request to greater than the second torque request.

6. An engine control system of a vehicle, comprising:

a torque requesting module that generates a torque request for an engine based on a driver input;

an air control module that, based on the torque request, controls opening of a wastegate of a turbocharger, opening of a throttle valve, and intake and exhaust valve phasers; and

a future request module that selectively determines an expected future increase in the torque request,

wherein, based on the expected future increase and before the torque request increases based on the expected future increase, the air control module decreases the opening of the wastegate and adjusts at least one of the intake valve phaser and the exhaust valve phaser to decrease a volumetric efficiency of the engine.

7. The engine control system of claim 6 wherein, when the torque request increases based on the expected future increase, the air control module maintains the opening of the wastegate and adjusts at least one of the intake valve phaser and the exhaust valve phaser to increase the volumetric efficiency of the engine.

8. The engine control system of claim 6 wherein:

the future request module, based on the expected future increase in the torque request in response to an increase in an accelerator pedal position, selectively sets a future torque request to greater than the torque request; and

the air control module, based on the future torque request and before the expected future increase in the torque request, decreases the opening of the wastegate and adjusts at least one of the intake valve phaser and the exhaust valve phaser to decrease the volumetric efficiency of the engine.

9. An engine control method for a vehicle, comprising:

determining a first torque request for an engine in response to an increase in an accelerator pedal position;

determining a second torque request based on the first torque request;

setting a future torque request to greater than the second torque request based on an expected increase in the first torque request in response to the increase in accelerator pedal position;

based on one of the second torque request and the future torque request, controlling;

opening of a wastegate of a turbocharger;

opening of a throttle valve based; and

an intake valve phaser and an exhaust valve phaser;

based on the future torque request being greater than the second torque request and before the expected increase in the first torque request;

decreasing the opening of the wastegate; and

adjusting at least one of the intake valve phaser and the exhaust valve phaser to decrease a volumetric efficiency of the engine.

10. The engine control method of claim 9 further comprising, after the decreasing the opening of the wastegate and the adjusting the at least one of the intake valve phaser and the exhaust valve phaser, when the first torque request increases in response to the increase in the accelerator pedal position, at least one of:

increasing the opening of the throttle valve; and

adjusting at least one of the intake valve phaser and the exhaust valve phaser to increase the volumetric efficiency of the engine.

11. The engine control method of claim 9 further comprising, after the decreasing the opening of the wastegate and the adjusting the at least one of the intake valve phaser and the exhaust valve phaser, when the first torque request increases in response to the increase in the accelerator pedal position:

maintaining the opening of the wastegate; and

at least one of;

increasing the opening of the throttle valve; and

adjusting at least one of the intake valve phaser and the exhaust valve phaser to increase the volumetric efficiency of the engine.

12. The engine control method of claim 10 further comprising, based on a second expected increase in the first torque request for engagement of an air conditioning compressor clutch, setting the future torque request to greater than the second torque request.

13. The engine control method of claim 10 further comprising, based on a second expected increase in the first torque request for a driver selecting a sport mode of operation of the vehicle, setting the future torque request to greater than the second torque request.