Engine speed control systems and methods

• US 9,599,049 B2
• Filed: 06/19/2014
• Issued: 03/21/2017
• Est. Priority Date: 06/19/2014
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations LLC (General Motors Company)
• Inventors: Zavala Jurado, Jose C., Cowgill, Joshua D.
• Primary Examiner(s): Weiss, Nicholas J
• Assistant Examiner(s): NEWTON, JASON TODD
• Application Number:
  US14/309,047
• Publication Number:
  US 20150369146A1
• Time in Patent Office: 1,006 Days
• Field of Search: 606/02
• US Class Current: 1/1
• 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 2041/1412 using a predictive controller
• CPC Class Codes: F02D 2041/1433 using a model or simulation of the system
• CPC Class Codes: F02D 2200/0402 the parameter being determined by using a model of the engine intake or its components
• CPC Class Codes: F02D 2200/0406 Intake manifold pressure
• CPC Class Codes: F02D 2200/0408 Estimation of intake manifold pressure
• CPC Class Codes: F02D 2250/18 Control of the engine output torque
• CPC Class Codes: F02D 31/001 Electric control of rotation speed
• CPC Class Codes: F02D 41/0002 Controlling intake air
• CPC Class Codes: F02D 41/0205 using an auxiliary engine speed control engine speed control per se F02D31/00
• CPC Class Codes: F02D 41/023 in relation with the gear ratio shifting conjoint control for improving gear change B60W30/19
• CPC Class Codes: F02D 41/10 for acceleration
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

A target engine speed module selectively sets M target engine speeds for M future times, respectively, based on one of increasing and decreasing an engine speed. A prediction module, based on a set of possible target values for the M future times and a model of an engine, determines M predicted engine speeds for the M future times, respectively. A cost module determines a cost for the set of possible target values based on comparisons of the M predicted engine speeds for the M future times with the M target engine speeds for the M future times, respectively. A selection module, based on the cost, selects the set of possible target values from a group including the set of possible target values and N other sets of possible target values, and sets target values based on the selected set of possible target values. An actuator module controls an engine actuator based on a first one of the target values.

Claims

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

a target engine speed circuit that selectively sets M target engine speeds for M future times, respectively, based on one of increasing and decreasing an engine speed,

wherein M is an integer greater than one;

a prediction circuit that, based on a set of possible target values for the M future times and a model of an engine, determines M predicted engine speeds for the M future times, respectively;

a cost circuit that determines a cost for the set of possible target values based on comparisons of the M predicted engine speeds for the M future times with the M target engine speeds for the M future times, respectively;

a selection circuit that, based on the cost, selects the set of possible target values from a group including the set of possible target values and N other sets of possible target values, wherein N is an integer greater than zero, and that sets target values based on the selected set of possible target values; and

an actuator circuit that controls an engine actuator based on a first one of the target values.

2. The engine control system of claim 1 wherein:

based on the set of possible target values and the model of the engine, the prediction circuit further determines M predicted intake manifold pressures for the M future times, respectively; and

the cost circuit determines the cost for the set of possible target values further based on comparisons of the M predicted intake manifold pressures with M intake manifold pressure ranges for the M future times, respectively.

3. The engine control system of claim 2 further comprising a constraint circuit that determines the M intake manifold pressure ranges for the M future times based on minimum and maximum air per cylinders (APCs) of the engine and at least one engine speed.

4. The engine control system of claim 1 wherein:

based on the set of possible target values and the model of the engine, the prediction circuit further determines M predicted torque outputs of the engine for the M future times, respectively; and

the cost circuit determines the cost for the set of possible target values further based on comparisons of the M predicted torques with M engine torque output ranges for the M future times, respectively.

5. The engine control system of claim 4 further comprising a constraint circuit that determines the M engine torque output ranges for the M future times based on M intake manifold pressure ranges for the M future times, respectively, and at least one engine speed.

6. The engine control system of claim 5 wherein:

based on the set of possible target values and the model of the engine, the prediction circuit further determines M predicted intake manifold pressures for the M future times, respectively; and

the cost circuit determines the cost for the set of possible target values further based on comparisons of the M predicted intake manifold pressures with the M intake manifold pressure ranges for the M future times, respectively.

7. The engine control system of claim 1 wherein the target engine speed circuit sets the M target engine speeds for the M future times, respectively, based on increasing the engine speed for a downshift of a transmission.

8. The engine control system of claim 1 wherein the target engine speed circuit sets the M target engine speeds for the M future times, respectively, based on decreasing the engine speed for an upshift of a transmission.

9. The engine control system of claim 1 wherein the selection circuit selects the set of possible target values from the group based on the cost being less than costs of the N other sets of possible target values, respectively.

10. The engine control system of claim 1 further comprising:

a boost actuator circuit that controls opening of a wastegate of a turbocharger based on a second one of the target values;

an exhaust gas recirculation (EGR) actuator circuit that controls opening of an EGR valve based on a third one of the target values;

a phaser actuator circuit that controls intake and exhaust valve phasing based on fourth and fifth ones of the target values, respectively;

a spark actuator circuit that controls spark timing based on a sixth one of the target values; and

a fuel actuator circuit that controls fueling based on a seventh one of the target values,

wherein the actuator circuit controls the opening of a throttle valve based on the one of the target values.

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

selectively setting M target engine speeds for M future times, respectively, based on one of increasing and decreasing an engine speed,

wherein M is an integer greater than one;

based on a set of possible target values for the M future times and a model of an engine, determining M predicted engine speeds for the M future times, respectively;

determining a cost for the set of possible target values based on comparisons of the M predicted engine speeds for the M future times with the M target engine speeds for the M future times, respectively;

based on the cost, selecting the set of possible target values from a group including the set of possible target values and N other sets of possible target values, wherein N is an integer greater than zero;

setting target values based on the selected set of possible target values; and

controlling an engine actuator based on a first one of the target values.

12. The engine control method of claim 11 further comprising:

based on the set of possible target values and the model of the engine, determining M predicted intake manifold pressures for the M future times, respectively; and

determining the cost for the set of possible target values further based on comparisons of the M predicted intake manifold pressures with M intake manifold pressure ranges for the M future times, respectively.

13. The engine control method of claim 12 further comprising determining the M intake manifold pressure ranges for the M future times based on minimum and maximum air per cylinders (APCs) of the engine and at least one engine speed.

14. The engine control method of claim 11 further comprising:

based on the set of possible target values and the model of the engine, determining M predicted torque outputs of the engine for the M future times, respectively; and

determining the cost for the set of possible target values further based on comparisons of the M predicted torques with M engine torque output ranges for the M future times, respectively.

15. The engine control method of claim 14 further comprising determining the M engine torque output ranges for the M future times based on M intake manifold pressure ranges for the M future times, respectively, and at least one engine speed.

16. The engine control method of claim 15 further comprising:

based on the set of possible target values and the model of the engine, determining M predicted intake manifold pressures for the M future times, respectively; and

determining the cost for the set of possible target values further based on comparisons of the M predicted intake manifold pressures with the M intake manifold pressure ranges for the M future times, respectively.

17. The engine control method of claim 11 further comprising setting the M target engine speeds for the M future times, respectively, based on increasing the engine speed for a downshift of a transmission.

18. The engine control method of claim 11 further comprising setting the M target engine speeds for the M future times, respectively, based on decreasing the engine speed for an upshift of a transmission.

19. The engine control method of claim 11 further comprising selecting the set of possible target values from the group based on the cost being less than costs of the N other sets of possible target values, respectively.

20. The engine control method of claim 11 further comprising:

controlling opening of a wastegate of a turbocharger based on a second one of the target values;

controlling opening of an exhaust gas recirculation (EGR) valve based on a third one of the target values;

controlling intake and exhaust valve phasing based on fourth and fifth ones of the target values, respectively;

controlling spark timing based on a sixth one of the target values; and

controlling fueling based on a seventh one of the target values,

wherein controlling the engine actuator based on the first one of the target values includes controlling opening of a throttle valve based on the first one of the target values.