US 11,092,089 B1Granted

Variable compression ratio engine control strategy

AssigneeGM Global Technology Operations LLC

InventorsJustin E. Ketterer, Ryan M. Heinbuch, Nathan M. Picot, Craig E. Slepicka, Pulasti Bandara, Christopher E. Whitney

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Abstract

A method of selecting a compression ratio in an internal combustion engine having a mechanism configured to vary the compression ratio includes receiving, via an electronic controller, a requested output torque value. The method also includes determining, via the controller, a value of engine speed corresponding to the requested output torque value. The method additionally includes determining, via the controller, a compression ratio value corresponding to the requested output torque value and the determined value of the engine speed. The method also includes determining, via the controller, a position of the mechanism corresponding to the determined compression ratio value. Furthermore, the method includes commanding, via the controller, the determined position of the mechanism and thereby selecting the determined compression ratio value. A vehicle employing a variable compression ratio internal combustion engine and an electronic controller configured to operate the engine according to the method is also disclosed.

Claims16

Dependent claims

A method of selecting a compression ratio in an internal combustion engine including a mechanism having a phasing actuator configured to shift a six-bar and vary the compression ratio, the method comprising:

receiving, via an electronic controller, a requested output torque value;
determining, via the electronic controller, a value of engine speed corresponding to the requested output torque value;
determining, via the electronic controller, a compression ratio value corresponding to the requested output torque value and the determined value of the engine speed;
determining, via the electronic controller, a position of the mechanism corresponding to the determined compression ratio value;
commanding, via the electronic controller, the determined position of the mechanism and thereby selecting the determined compression ratio value;
detecting output torque via a sensor and communicating the detected output torque to the electronic controller;
determining, via the electronic controller, a difference between the detected output torque and the requested output torque value;
and
commanding, via the electronic controller, the phasing actuator to shift the six-bar linkage relative to the engine block to minimize the determined difference between the detected output torque and the requested output torque value.

6 more elements

A vehicle comprising:

a road wheel;
a variable compression ratio (VCR) internal combustion engine configured to generate output torque for driving the road wheel, the engine having a mechanism having a phasing actuator configured to shift a six-bar linkage and vary a compression ratio of the VCR engine;
a sensor configured to detect output torque;
and
an electronic controller in communication with the sensor and configured to regulate operation of the VCR engine via:
receiving a requested output torque value;
determining a value of engine speed corresponding to the requested output torque value;
determining a compression ratio value corresponding to the requested output torque value and the determined value of the engine speed;
determining a position of the mechanism corresponding to the determined compression ratio value;
commanding the determined position of the mechanism and thereby selecting the determined compression ratio value;
receiving the detected output torque from the sensor;
determining a difference between the detected output torque and the requested output torque value;
and
commanding the phasing actuator to shift the six-bar linkage relative to the engine block to minimize the determined difference between the detected output torque and the requested output torque value.

11 more elements

Dependencies are inferred from the claim text.