Sensor provided with adjusting function

Abstract

An object of the present invention is to provide an automatic compensation sensor that can eliminate an exclusive input terminal for the compensation mode signal. To achieve this object, the present invention comprises a sensor body ( 1 ), a signal output terminal ( 5 ) for outputting signals from the sensor body ( 1 ), and a controller for compensating the output signal from this signal output terminal ( 5 ).

1. An automatic compensation sensor comprising:
 aat least one signal output  terminal for outputting a compensated sensor signal in a normal mode and for receivinginputting an external compensation signal in a compensation mode;  
 a sensing unit for outputting a sensor signal responsive to a condition which is sensed by said sensing unit;  
 compensation value means  processor coupled to the signal terminal for determining  selecting and outputting based on a further condition, one of a plurality of compensation value  values in the normal mode and for setting  storing the plurality of compensation value  values in the compensation mode based on  when the external compensation signal is input to the signal terminal and received by the compensation value processor; and  
 an adder for summing the sensor signal and the selected one of the plurality of compensation value  values and for producing the compensated sensor signal.  
 
     
     
       2. The automatic compensation sensor of  claim 1 , wherein the compensation value means  processor receives the compensated sensor signal in the compensation mode and sets the one of a plurality of compensation value  values based on the compensated sensor signal and the external compensation signal. 
     
     
       3. The automatic compensation sensor of  claim 1 , further comprising:
 a diagnosis circuit responsive to the sensing unit and to the compensation value means  processor for outputting a diagnosis signal, wherein the compensation value means  processor receives the compensation signal  diagnosis signal.  
 
     
     
       4. An  The automatic compensation sensor according to  claim 1 , further comprising:
 a sensing unit for outputting a sensor signal; 
 an Alternating Current (AC) component separator for outputting said external compensation signal which is an AC component signal;  
 compensation value means for determining and outputting a compensation value in a normal mode and for setting the compensation value in a compensation mode based on the AC component signal; and  
 an adder for summing the sensor signal and the compensation value and for producing the compensated sensor signal .  
 
     
     
       5. An  The automatic compensation sensor according to  claim 1 , further comprising:
 a sensor body having an analog input for receiving an analog signal, the sensor body including:  
 a sensing unit for producing a first sensor signal,  
 an adder for summing the analog signal with the first sensor signal and for producing a compensated sensor signal, and  
 a signal output stage for adjusting and outputting the compensated sensor signal;  
 a sensor for producing a second sensor signal;  
 an error amplifier for generating an error signal based on the compensated sensor signal and a predetermined reference value; and , wherein the  
 compensation value means, having a memory for storing a plurality of compensation values, for generating  processor generates the analog  external compensation signal based on at least one of the plurality of compensation values, the second  sensor signal, and the error signal.  
 
     
     
       6. The automatic compensation sensor of  claim 5 , wherein the sensor is a temperature sensor. 
     
     
       7. The automatic compensation sensor of  claim 6 , wherein the compensation value means  processor calculates a mean value of a plurality of error signal measurements for each of a plurality of temperatures, and wherein the compensation value means  processor updates each of the plurality of compensation values based on the mean value. 
     
     
       8. The automatic compensation sensor of  claim 6 , wherein the compensation value means  processor calculates a plurality of mean values each associated with a plurality of error signal measurements taken in one of a plurality of temperature zones, and wherein the compensation value means  processor updates each of the plurality of compensation values based on the mean value. 
     
     
       9. The automatic compensation sensor of  claim 5 , wherein the compensation value means  processor further includes an abnormal value detection output which is activated by the detection of an abnormality. 
     
     
       10. The automatic compensation sensor of  claim 1 , wherein each of said plurality of compensation values corresponds to a respective temperature.  
     
     
       11. The automatic compensation sensor according to  claim 1 , wherein said further condition includes temperature information.