Determining manifold pressure based on engine torque control
a technology of torque control and manifold pressure, which is applied in the direction of electric control, machines/engines, instruments, etc., can solve problems such as unexpected vehicle feel
Active Publication Date: 2005-12-15
GM GLOBAL TECH OPERATIONS LLC
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Benefits of technology
The present invention provides a torque control system for an engine that regulates the amount of air entering the engine to control engine torque. The system uses a throttle plate with an adjustable position to regulate air flow. The system estimates the previous efficiency of the engine and calculates the difference between the current efficiency and the previous efficiency. The control module then determines the desired air flow based on this difference and commands the throttle position accordingly. The system also updates the efficiency for subsequent time steps and takes into account engine speed and the phase angle of the cam shaft. The torque control system includes an accelerator and determines the mass of air flowing through the throttle based on the accelerator position. The current air flow is also based on the temperature of the air and the mass of air flowing through an exhaust gas recirculation valve. The technical effect of the invention is to provide a more precise and efficient method for controlling engine torque.
Problems solved by technology
This results in an a more aggressive partial throttle acceleration, but may lead to an unexpected feel of the vehicle to the driver by not producing the expected behavior of the throttle to a step-in change in the accelerator pedal.
Method used
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[0017] The following description of the preferred embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. For purposes of clarity, the same reference numbers will be used in the drawings to identify similar elements. As used herein, the term module refers to an application specific integrated circuit (ASIC), an electronic circuit, a processor (shared, dedicated, or group) and memory that execute one or more software or firmware programs, a combinational logic circuit, or other suitable components that provide the described functionality.
[0018] Referring now to FIG. 1, an engine system 10 includes an engine 12 that combusts an air and fuel mixture to produce drive torque. Air is drawn into an intake manifold 14 through a throttle 16. The throttle 16 regulates mass air flow into the intake manifold 14. Air within the intake manifold 14 is distributed into cylinders 18. Although a single cylinder 18 is illustrated, it is app...
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A torque control system for an engine includes a throttle plate having an adjustable throttle position to regulate a first mass air flow into the engine. A control module estimates a previous volumetric efficiency of the engine based on a previous manifold absolute pressure (MAP) and determines a current MAP based on the previous volumetric efficiency. The control module calculates a difference between the current MAP and the previous MAP and sets a desired MAP equal to the present MAP when the difference is less than a threshold difference. The control module commands the throttle position based on the desired MAP.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is related to U.S. application Ser. No. ______, filed Jun. 15, 2004, entitled, “Determining Manifold Pressure Based on Engine Torque Control” (GM Ref: GP-305270). The disclosure of the above application is incorporated herein by reference.FIELD OF THE INVENTION [0002] The present invention relates to engine torque control, and more particularly to determining manifold pressure based on engine torque control. BACKGROUND OF THE INVENTION [0003] Internal combustion engine control systems have been developed as steady-state, torque-based control systems. In a torque-based control system, the desired torque output of the engine is indicated by a driver input. More specifically, a driver adjusts a position of an accelerator pedal, which provides an engine torque request. The throttle is controlled to regulate air flow into the engine that provides the desired engine torque output. [0004] Torque-based control systems determine...
Claims
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IPC IPC(8): F02D9/08F02D11/10F02D13/02F02D41/00F02D45/00F02M25/07
CPCF02D11/105F02D13/0219F02D41/0002F02D2041/001F02D2200/0402F02D2200/0408F02D2250/18Y02T10/42F02M26/05Y02T10/40
Inventor MATTHEWS, GREGORY P.LIVSHIZ, MICHAEL
Owner GM GLOBAL TECH OPERATIONS LLC