A sensor controller for a particulate matter detection sensor includes a heater configured to heat an attachment portion so as to burn and remove particulate matter attached to the attachment portion, a learning portion for obtaining a sensor detection value immediately after burning and removing th
A sensor controller for a particulate matter detection sensor includes a heater configured to heat an attachment portion so as to burn and remove particulate matter attached to the attachment portion, a learning portion for obtaining a sensor detection value immediately after burning and removing the particulate matter due to heating of the heater. The leaning portion calculates a sensor standard value based on the obtained sensor detection value in a state where the particulate matter is removed, and stores the sensor standard value as a learning value. Furthermore, a correcting portion corrects the sensor detection value based on the sensor standard value stored by the learning portion.
대표청구항▼
1. A sensor controller system configured to control the operation of an engine, the sensor controller system comprising:a particulate matter detection sensor; anda sensor controller comprising:a heater connected to the particulate matter detection sensor, the particulate matter detection sensor incl
1. A sensor controller system configured to control the operation of an engine, the sensor controller system comprising:a particulate matter detection sensor; anda sensor controller comprising:a heater connected to the particulate matter detection sensor, the particulate matter detection sensor including an attachment portion to which conductive particulate matter contained in gas is attached, and a pair of opposed electrodes spaced from each other at the attachment portion, the heater heating, via the pair of opposed electrodes, the attachment portion so as to burn and remove the particulate matter attached to the attachment portion; anda computer processor connected to the particular matter detection sensor and the engine, the computer processor performing at leastobtaining a sensor detection value, corresponding to a resistance between the pair of opposed electrodes, outputted from the particulate matter detection sensor immediately after the burning and removing the particulate matter due to heating of the heater,calculating a first sensor standard value based on the obtained sensor detection value in a state where the particulate matter is removed from the attachment portion,storing the first sensor standard value as a first learning valuecorrecting a sensor detection value outputted from the particulate matter detection sensor based on the stored first sensor standard value,calculating an amount of attached particulate matter based on the corrected sensor detection value,outputting a control signal to the engine based on the calculated amount of attached particulate matter, andcontrolling the operation of the engine. 2. The sensor controller system according to claim 1, wherein the computer processor is configured to further perform calculating correction values that are different from each other in accordance with the amounts of the attached particulate matter, based on the first sensor standard value, and correcting the sensor detection value by using the calculated correction values. 3. The sensor controller system according to claim 1, wherein the computer processor is configured to further perform diagnosis of abnormality of the particulate matter detection sensor based on the sensor detection value obtained immediately after burning and removing of the particulate matter. 4. The sensor controller system according to claim 1, wherein the computer processor is configured to further perform obtaining the sensor detection value in a state where the resistance between the pair of opposed electrodes varies to be increased and a variation amount of the resistance is within a predetermined range, and calculating the first sensor standard value based on the obtained sensor detection value. 5. The sensor controller system according to claim 1, wherein the particulate matter detection sensor is connected to a signal output circuit such that the sensor detection value is changeable in a predetermined output range by the signal output circuit,the learning means obtains the sensor detection value in a burning of the particulate matter due to heating of the heater, calculates a second sensor standard value in a state where the resistance between the pair of opposed electrodes is reduced based on the obtained sensor detection value, and stores the second sensor standard value as a second learning value; andthe correcting means corrects the sensor detection value based on at least one of the first sensor standard value and the second sensor standard value stored by the learning means. 6. The sensor controller system according to claim 5, wherein the signal output circuit is a voltage-dividing circuit that has an electrode resistance corresponding to the resistance of the pair of opposed electrodes, a shunt resistance and an electrical source portion,the voltage-dividing circuit is configured to output a voltage at a middle point between the electrode resistance and the shunt resistance as the sensor detection value, andthe learning means obtains the voltage at the middle point in the burning of the particulate matter, and calculates the second sensor standard value based on the voltage at the middle point. 7. The sensor controller system according to claim 6, wherein the correcting means calculates correction values that are different from each other in accordance with the amounts of the attached particulate matter based on the second sensor standard value, and corrects the sensor detection value by using the calculated correction values. 8. The sensor controller system according to claim 5, further comprising abnormality diagnosis means for performing diagnosis of abnormality of the particulate matter detection sensor based on the sensor detection value in the burning of the particulate matter. 9. The sensor controller system according to claim 5, wherein the learning means obtains the sensor detection value in a state where the resistance between the pair of opposed electrodes varies to be decreased and a variation amount of the resistance is within a predetermined range, and calculates the second sensor standard value based on the obtained sensor detection value. 10. The sensor controller system according to claim 2, wherein the computer processor is configured to further perform calculating the correction value based on the first sensor standard value, such that the correction value is smaller as the amount of the attached particulate matter becomes larger. 11. The sensor controller system according to claim 7, wherein the correcting means calculates the correction value based on the second sensor standard value such that the correction value is smaller as the amount of the attached particulate matter becomes smaller and is larger as the amount of the attached particulate matter becomes larger. 12. The sensor controller system according to claim 4, wherein the particulate matter detection sensor further comprises a voltage-dividing circuit that comprises the pair of opposed electrodes of the attachment portion, a shunt resistance and an electrical source portion, and has an electrode resistance corresponding to the resistance of the pair of opposed electrodes, whereinthe voltage-dividing circuit is configured to output a voltage at a middle point between the electrode resistance and the shunt resistance as the sensor detection value, and whereinthe computer processor is further configured to perform obtaining the voltage at the middle point immediately after the burning and removing of the particulate matter, and calculating the first sensor standard value based on the voltage at the middle point.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (18)
Takeuchi Yukihisa (Chita JPX) Miura Yasunao (Kasugai JPX) Hirayama Tsukasa (Ohbu JPX), Detector for particulate density and filter with detector for particulate density.
Wirth, Ralf; Haerle, Heribert; Handler, Torsten; Samuelsen, Dirk; Christl, Werner; Rösch, Sabine; Kamp, Bernhard; Kolitsch, Michael; Schaenzlin, Katharina, Method for operating a sensor for recording particles in a gas stream and device for implementing the method.
Schnell, Frank; Schmidt, Ralf; Glanz, Uwe; Rösch, Sabine; Marx, Helmut; Schaenzlin, Katharina; Schittenhelm, Henrik, Sensor for detecting particles in a gas stream and method for its manufacture.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.