Method of operating a ventilation system especially of a motor vehicle
First Claim
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1. A method of operating a ventilation system, comprising the steps of:
- (a) supplying air to a space to be ventilated and formed by a cabin of an automotive vehicle;
(b) detecting a concentration of a target gas in air to be supplied to said space and generating an actual value electrical signal as a measure of said concentration;
(c) automatically forming an integral value by integrating said actual value signal over a selected time period;
(d) automatically generating a switching signal and cutting off supply of said air to said space with said switching signal selectively upon;
(d1) said actual value signal varying through a first threshold determined by said integral value and in a direction representing a certain increased concentration of said target gas, and(d2) a rate of change of said actual value signal in said direction over a preselected time interval exceeds a preselected value;
(e) automatically canceling said switching signal and restoring supply of said air to said space upon a change in said actual value signal in an opposite direction; and
(f) monitoring a gradient in said actual value signal after cancellation of said switching signal and restoration of supply of air to said space and, upon reversal of said gradient, adding an absolute value of the negative gradient to an absolute value of the positive gradient, and triggering a switching pulse to again cut off flow of air to said space when the sum of absolute values of said gradients is greater or said actual value signal is less than said further value.
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Abstract
The previously presented teaching of the invention describes a method for the evaluation of sensor signals with the purpose of producing plausible and physiologically satisfying switching impulses for interrupting or for opening the air supply in ventilation systems, particularly for the ventilation of passenger cabins in motor vehicles, depending on the pollutant content of the ambient air established by one or more sensors.
19 Citations
10 Claims
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1. A method of operating a ventilation system, comprising the steps of:
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(a) supplying air to a space to be ventilated and formed by a cabin of an automotive vehicle; (b) detecting a concentration of a target gas in air to be supplied to said space and generating an actual value electrical signal as a measure of said concentration; (c) automatically forming an integral value by integrating said actual value signal over a selected time period; (d) automatically generating a switching signal and cutting off supply of said air to said space with said switching signal selectively upon; (d1) said actual value signal varying through a first threshold determined by said integral value and in a direction representing a certain increased concentration of said target gas, and (d2) a rate of change of said actual value signal in said direction over a preselected time interval exceeds a preselected value; (e) automatically canceling said switching signal and restoring supply of said air to said space upon a change in said actual value signal in an opposite direction; and (f) monitoring a gradient in said actual value signal after cancellation of said switching signal and restoration of supply of air to said space and, upon reversal of said gradient, adding an absolute value of the negative gradient to an absolute value of the positive gradient, and triggering a switching pulse to again cut off flow of air to said space when the sum of absolute values of said gradients is greater or said actual value signal is less than said further value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of operating a ventilation system, comprising the steps of:
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(a) supplying air to a space to be ventilated and formed by a cabin of an automotive vehicle; (b) detecting a concentration of a target gas in air to be supplied to said space and generating an actual value electrical signal as a measure of said concentration; (c) automatically forming an integral value by integrating said actual value signal over a selected time period; (d) automatically generating a switching signal and cutting off supply of said air to said space with said switching signal selectively upon; (d1) said actual value signal varying through a first threshold determined by said integral value and in a direction representing a certain increased concentration of said target gas, and (d2) a rate of chance of said actual value signal in said direction over a preselected time interval exceeds a preselected value; (e) automatically canceling said switching signal and restoring supply of said air to said space upon a change in said actual value signal in an opposite direction; and (f) monitoring a gradient in said actual value signal after cancellation of said switching signal and restoration of supply of air to said space and, upon reversal of said gradient, adding absolute value of the negative gradient to an absolute value of the positive gradient and triggering a switching pulse to again cut off flow of air to said space when the sum of absolute values of said gradients is smaller than a further valve or said actual value signal is greater than said further value.
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10. A method of operating a ventilation system, comprising the steps of:
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(a) supplying air to a space to be ventilated and formed by a cabin of an automotive vehicle; (b) detecting a concentration of a target gas in air to be supplied to said space and generating an actual value electrical signal as a measure of said concentration; (c) automatically forming an integral value by integrating said actual value signal over a selected time period; (d) automatically generating a switching signal and cutting off supplv of said air to said space with said switching signal selectively upon; (d1) said actual value signal varying through a first threshold determined by said integral value and in a direction representing a certain increased concentration of said target gas, and (d2) a rate of change of said actual value signal in said direction over a preselected time interval exceeds a preselected value; (e) automatically canceling said switching signal and restoring supply of said air to said space upon a change in said actual value signal in an opposite direction; and (f) interrupting said integral value when a gradient of the actual value signal becomes positive in a case in which said concentration is measured with a sensor having a reduced resistance in the presence of said target gas and, when said gradient is positive, forming a threshold by deducting an amount (x) from the actual sensor value.
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Specification