Exhaust gas control system and exhaust gas control method
AssigneeKNORR-BREMSE Systeme fuer Nutzfahrzeuge GmbH
InventorMichael Herges
Life of this patent
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Abstract
An exhaust gas control system and an exhaust gas control method are provided. The exhaust gas control system includes an exhaust gas throttle valve in an exhaust gas duct and an actuation device of the exhaust gas throttle valve having an actuating rod. An exhaust gas pressure control device controls the exhaust gas pressure occurring upstream of the exhaust gas throttle valve in the exhaust gas duct. The actuating rod also includes a control actuator that interacts with a pressure compensation volume. The pressure compensation volume is pneumatically connected to a throttle opening upstream of the exhaust gas throttle valve.
Claims33
An exhaust gas control system for use with an exhaust gas duct, comprising:
- an exhaust gas throttle valve arrangeable in the exhaust gas duct;
- an actuation device for actuating the exhaust gas throttle valve, said actuation device having an actuating linkage;
- an exhaust gas pressure control device for controlling exhaust gas pressure occurring in the exhaust gas duct upstream of the exhaust gas throttle valve;
- and
- wherein the actuating linkage includes a control actuator, which interacts with a pressure compensation volume, the pressure compensation volume being connected pneumatically to a restrictor opening upstream of the exhaust gas throttle valve;
- and
- wherein the restrictor opening in conjunction with the compensation volume function as a delay element largely filtering high-frequency pressure peaks out of pulsations in the exhaust gas pressure.
A method of controlling exhaust gas via an exhaust gas control system including an exhaust gas throttle valve arranged in an exhaust gas duct, an actuation device operatively configured for the exhaust gas throttle valve and including an actuating linkage, and an exhaust gas pressure control device for controlling pulsating exhaust gas pressures occurring in the exhaust gas duct upstream of the exhaust gas throttle valve, the method comprising the acts of:
- feeding a pulsating exhaust gas pressure from a restrictor opening provided upstream of the exhaust gas throttle valve to a pressure compensation volume;
- filtering high-frequency pressure peaks out of the pulsating exhaust gas pressure via the restrictor opening operating in conjunction with the compensation volume to function as a delay element;
- feeding the filtered exhaust gas pressure to a control actuator;
- holding the exhaust gas throttle valve stably in an open position by way of the actuating linkage having the control actuator when in a first end position of a drive;
- and
- holding the exhaust gas throttle valve in a stable position controlled by applied pressure of the compensated exhaust gas pressure fed to the control actuator by way of the actuating linkage when in a second end position of the drive.
Dependencies are inferred from the claim text.