Method of establishing baseline filter for air quality

A method of establishing a baseline filter for an air quality sensor in a motor vehicle, said method comprising the steps of:

• providing an air quality sensor for intake air into an occupant compartment of the motor vehicle;
• establishing a moving baseline for a background signal level from the air quality sensor;
• and
• shutting off intake air into an occupant compartment of the motor vehicle when the background signal level exceeds a certain threshold above the moving baseline, thereby preventing undesired gases in the intake air from reaching occupants in the occupant compartment;
• and
• wherein said step of establishing comprises calculating the moving baseline according to the equation yk+1=(1−β)yk+βu′k.

A method of establishing a baseline filter for an air quality sensor in a motor vehicle, said method comprising the steps of:

• providing an air quality sensor for intake air into an occupant compartment of the motor vehicle;
• establishing a moving baseline for a background signal level from the air quality sensor;
• and
• shutting off intake air into an occupant compartment of the motor vehicle when the background signal level exceeds a certain threshold above the moving baseline, thereby preventing undesired gases in the intake air from reaching occupants in the occupant compartment;
• and
• initializing time t equal to zero.

A method of establishing a baseline filter for an air quality sensor in a motor vehicle, said method comprising the steps of:

• providing an air quality sensor for intake air into an occupant compartment of the motor vehicle;
• establishing a moving baseline for a background signal level from the air quality sensor;
• and
• shutting off intake air into an occupant compartment of the motor vehicle when the background signal level exceeds a certain threshold above the moving baseline, thereby preventing undesired gases in the intake air from reaching occupants in the occupant compartment;
• and
• calculating an intermediate signal level according to the equation zk+1=(1−β)zk+βuk.

A method of establishing a baseline filter for an air quality sensor in a motor vehicle, said method comprising the steps of:

• providing an air quality sensor for intake air into an occupant compartment of the motor vehicle;
• establishing a moving baseline for a background signal level from the air quality sensor by calculating an intermediate signal level according to the equation zk+1=(1−β)zk+βuk and calculating the moving baseline according to the equation yk+1=(1−β)yk+βu′k;
• and
• shutting off intake air into an occupant compartment of the motor vehicle when the background signal level exceeds a certain threshold above the moving baseline, thereby preventing undesired gases in the intake air from reaching occupants in the occupant compartment.

A method of establishing a baseline filter for an air quality sensor in a motor vehicle, said method comprising the steps of:

• providing an air quality sensor for intake air into an occupant compartment of the motor vehicle;
• establishing a moving baseline for a background signal level from the air quality sensor by calculating an intermediate signal level according to the equation zk+1=(1−β)zk+βuk and calculating the moving baseline according to the equation yk+1=(1−β)yk+βu′k;
• and
• shutting off intake air into an occupant compartment of the motor vehicle when the background signal level exceeds a certain threshold above the moving baseline, thereby preventing undesired gases in the intake air from reaching occupants in the occupant compartment;
• and
• determining whether a sensed sample of air, uk, is less than or equal to the moving baseline, yk, plus a threshold, θ.