Systems and Methods to Control Torsional Vibration in an Internal Combustion Engine with Cylinder Deactivation
First Claim
1. A method to control torsional vibrations due to cylinder deactivation, comprising:
- measuring gas pressure in an active and a deactivated cylinder;
determining a target pressure for the deactivated cylinder responsive to the measured gas pressure in the active cylinder; and
adjusting a phase on a pressure control valve of the deactivated cylinder responsive to a difference between the measured gas pressure in the deactivated cylinder and the determined target pressure for the deactivated cylinder.
12 Assignments
0 Petitions
Accused Products
Abstract
The present disclosure utilizes deactivated cylinders in a variable displacement engine to control the torsional vibration of a crankshaft. In a deactivated mode, deactivated cylinders are compressed and expanded by a reciprocating piston, but they are doing no net work and still causing an oscillating torque on the crankshaft. The present disclosure utilizes this oscillating torque to counter torque from the active cylinders. This is done through controlling the gas pressure in the deactivated cylinders by using intake and exhaust values to equalize the pressure between the cylinder and ports. The optimum gas pressure in deactivated cylinders to minimize total torque fluctuations is approximately one-half that of the active cylinders. A closed control loop adjusts gas pressure in the deactivated cylinders to cancel out torque from the active cylinders.
-
Citations
18 Claims
-
1. A method to control torsional vibrations due to cylinder deactivation, comprising:
-
measuring gas pressure in an active and a deactivated cylinder; determining a target pressure for the deactivated cylinder responsive to the measured gas pressure in the active cylinder; and adjusting a phase on a pressure control valve of the deactivated cylinder responsive to a difference between the measured gas pressure in the deactivated cylinder and the determined target pressure for the deactivated cylinder. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A torsional vibration control system for engine configured with cylinder deactivation, comprising:
-
a plurality of cylinders each comprising a cylinder pressure sensor and a pressure control valve, wherein the cylinder pressure sensor is configured to measure gas pressure in the cylinder; and an electronic control unit in communication with each of the cylinder pressure sensors in the plurality of cylinders, wherein the electronic control unit is configured to; receive gas pressure measurements for each of the plurality of cylinders; determine a maximum gas pressure for each active cylinder of the plurality of cylinders; compute an average of the maximum gas pressures for each active cylinder; determine an optimal pressure for each deactivated cylinder of the plurality of cylinders responsive to the computed gas pressures; and manage the pressure control valve in each of the deactivated cylinders to achieve the optimal pressure. - View Dependent Claims (11, 12, 13, 14, 15, 16)
-
-
17. A closed control loop method to control torsional vibrations in a V8 engine with variable displacement due to cylinder deactivation, comprising:
-
measuring gas pressure in a plurality of active and deactivated cylinders; determining the maximum gas pressure value for an engine cycle for each of the plurality of active cylinders; averaging the maximum gas pressure value for each of the plurality of active cylinders; dividing the average by one-half to obtain a target pressure for each of the plurality of deactivated cylinders; comparing the target pressure to the measured gas pressure for each of the deactivated cylinders; adjusting the phase of a pressure control value for each of the plurality of deactivated cylinders responsive to the comparing step; and opening the pressure control valve for each of the plurality of deactivated cylinders when a piston is at bottom dead center. - View Dependent Claims (18)
-
Specification