Engine control systems and methods for future torque request increases

Patent metadata

Field	Value
Publication number	US-9920697-B2
Application number	US-201414225496-A
Country	US
Kind code	B2
Filing date	Mar 26, 2014
Priority date	Mar 26, 2014
Publication date	Mar 20, 2018
Grant date	Mar 20, 2018

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.

First claim

What is claimed is:

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.

Assignees

• Gm Global Tech Operations Llc

Inventors

• Pochner Klaus
• Whitney Christopher E

Classifications

• F02D2041/002

  by simultaneous control of throttle and variable valve actuation · CPC title

• F02D2250/18

  Control of the engine output torque · CPC title

• F02D2009/0205

  working on the throttle valve and another valve, e.g. choke · CPC title

• F02D2009/0276

  Throttle and EGR-valve operated together · CPC title

• F02D23/00

  Controlling engines characterised by their being supercharged · CPC title