SENSOR SYSTEM

• US 20160327418A1
• Filed: 04/13/2016
• Published: 11/10/2016
• Est. Priority Date: 06/04/2010
• Status: Abandoned Application

• Current Assignee: Sensirion AG (Sensirion Holding AG)
• Original Assignee: Sensirion AG (Sensirion Holding AG)
• Inventors: HESS, Vincent, GRAF, Markus, NIEDERBERGER, Dominik
• Application Number:
  US15/097,356
• Publication Number:
  US 20160327418A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G01D 18/008 with calibration coefficients stored in memory
• CPC Class Codes: G01D 3/0365 the undesired influence being measured using a separate sensor, which produces an influence related signal

Abstract

Disclosed is a method for adjusting a sensor signal and a corresponding sensor system comprising a sensor for providing a sensor signal representative of a measure other than temperature, dynamic components of the sensor signal being dependent on temperature. In addition there is provided a temperature sensor for measuring the temperature. Dynamic components in the sensor signal are adjusted subject to the temperature sensed, and a compensated sensor signal is supplied. Such sensor system helps compensating for long response times of sensors.

Claims

1. A sensor system, comprising

a sensor providing a sensor signal representative of a measure other than temperature, dynamic components of the sensor signal being dependent on temperature,

a temperature sensor for providing a temperature signal, and

a compensation filter receiving the sensor signal and the temperature signal,

wherein the compensation filter is designed for adjusting the dynamic components in the sensor signal subject to the temperature signal, and for providing a compensated sensor signal, and

wherein the compensation filter is modeled based on an inverse of a transfer function of a sensor model of the sensor, which compensation filter contains temperature dependent terms, said model being provided in a spectral domain.

2. The sensor system of claim 1,

wherein the sensor model modelled for building the compensation filter is a sensor model of second order.

3. The sensor system of claim 2,

wherein the sensor comprises a housing,

wherein the sensor comprises a sensor element sensitive to a component in a medium outside the housing,

wherein the sensor model of second order represents two diffusion processes, a first one of which diffusion processes is a diffusion process from the outside into the housing, a second one of which diffusion processes is a diffusion process from within the housing into the sensor element.

4. The sensor system of claim 2,

wherein the transfer function of the sensor model of second order is

5. The sensor system of claim 2,

wherein the compensation filter is a compensation filter of second order.

6. The sensor system of claim 4,

wherein a transfer function C₂(s) of the compensation filter is:

7. The sensor system of claim 1,

wherein the sensor model modelled for building the compensation filter is a sensor model of first order.

8. The sensor system of claim 7,

wherein the sensor comprises a sensor element sensitive to a component in a medium outside the housing,

wherein the sensor model of first order represents a dominant diffusion process for the medium to reach the sensor element.

9. The sensor system of claim 7,

wherein the transfer function of the sensor model of first order is

10. The sensor system of claim 7,

wherein the compensation filter is a compensation filter of first order.

11. The sensor system of claim 9,

wherein a transfer function C₁(s) of the compensation filter is:

12. The sensor system of claim 1,

wherein the compensation filter comprises a temperature continuous compensation model.

13. The sensor system according to claim 1,

wherein the sensor is a humidity sensor.

14. The sensor system according to claim 13,

wherein the humidity sensor and the temperature sensor are arranged close to a pane of a vehicle for detecting fogging of the pane.

15. The sensor system of claim 1,

wherein the compensation filter is designed to decrease a response time of the sensor signal subject to the temperature signal.

16. The sensor system of claim 1,

wherein the same order selected for the transfer function of the sensor model is applied to the transfer function of the compensating filter.

17. A method for adjusting a sensor signal, comprising the steps of:

(a) sensing a temperature,

(b) providing a sensor signal representative of a measure other than temperature, dynamic components of the sensor signal being dependent on temperature, and

(c) by a computing device configured for doing so,

(i) adjusting the dynamic components in the sensor signal subject to the temperature sensed, and

(ii) providing a compensated sensor signal,

wherein the computing device comprises a compensation filter receiving the sensor signal and the temperature signal,

wherein the compensation filter is designed for adjusting the dynamic components in the sensor signal subject to the temperature signal, and for providing a compensated sensor signal, and wherein the compensation filter is modeled based on an inverse of a transfer function of a sensor model of the sensor, which compensation filter contains temperature dependent terms, said model being provided in a spectral domain, and wherein said steps are executed on a sensor system according to claim 1.

18. The method according to claim 17,

wherein the dynamic components in the sensor signal are adjusted by applying a temperature continuous compensation model.

19. The method according to claim 17,

wherein the sensor signal represents measured humidity, and

wherein the compensated sensor signal is used in an antifogging application in a vehicle.