Abstract: A measurement apparatus includes a plurality of modules and a main unit for collecting measurement data output from the modules. The housing of the main unit can be carried by a user of the measurement apparatus, and the plurality of modules are removably accommodated in the housing. A controller area network interface circuit of the main unit collects the measurement data output from the modules accommodated in the housing. A main CPU of the main unit outputs the collected measurement data to, for example, a personal computer connected to the main unit. An internal memory and a USB memory connected to a USB memory module store the collected measurement data.

Abstract: A particulate detection apparatus (3) controls a particulate sensor (2) for detecting the amount of particulates contained in exhaust gas and which has a pump (203) for supplying air to a detection section of the particulate sensor (2) into which the exhaust gas is introduced. The particulate detection apparatus (3) detects the flow rate of air supplied from the pump (203) to the particulate sensor (2) by a flow rate sensor (207). The particulate detection apparatus (3) maintains a consistent detection accuracy of the particulate sensor (2) based on the result of the detection by the flow rate sensor (207).

Abstract: A particulate measurement apparatus controls a particulate sensor which includes an ion generation section (110), an exhaust gas electrification section (120), an ion trapping section (130), and a second electrode (132). The second electrode (132) is maintained at a potential repulses the ions to assist the trapping of the ions at the ion trapping section (130). The particulate measurement apparatus includes a second isolation transformer (720b) and an auxiliary electrode current measurement circuit (780). The second isolation transformer (720b) applies a voltage to the second electrode (132) through a second wiring line (222). The auxiliary electrode current measurement circuit (780) detects an auxiliary electrode current Iir flowing to the second wiring line (222). The particulate measurement apparatus determines at least one of the state of the particulate sensor and the state of the second wiring line (222) based on the auxiliary electrode current Iir.

Abstract: A particulate measurement system (10) includes an auxiliary electrode current measurement circuit (780), which can determine whether or not an auxiliary electrode current Iir has flowed to a second wiring line (222) as well as its magnitude. When a particulate sensor (100) is operating normally, since a second electrode (132) and a casing CS are electrically insulated from each other, no current flows to the second wiring line (222). However, when the second electrode (132) and the casing CS are electrically shorted by soot or the like, the auxiliary electrode current Iir flows to the second wiring line (222). Therefore, by providing the auxiliary electrode current measurement circuit (780), the particulate measurement system (10) can determine the state of adhesion of particulates, etc., in the particulate sensor (100), and can determine whether or not the particulate measurement system (10) is in an anomalous state.

Abstract: In a heather control apparatus for a gas sensor, a CPU obtains upper and lower limit values by adding a predetermined value to and subtracting the predetermined value from an Rpvs average obtained in a last heater energization period (or to an Rpvs value obtained for the first time), and sets a window W1. The CPU obtains a plurality of Rpvs values [P2] to [P11], and obtains an Rpvs average A1 while excluding Rpvs values [P5], [P6], and [P9] which do not fall within the window W1 (not less than the lower limit value and not greater than the upper limit value). The CPU obtains the upper and lower limit values by adding the predetermined value to and subtracting the predetermined value from the Rpvs average A1, and sets a window W2 for the next heater energization period.

Abstract: A load drive apparatus (1) includes a pulse drive circuit (51) which applies a pulse voltage PS to a resistive load (4); current detection means (S14) for detecting the current flowing to the resistive load (4) through the pulse drive circuit (51); level detection means (S1, S7) for determining whether an output terminal voltage VD of the pulse drive circuit (51) is a high potential level or a low potential level; anomaly detection means (S8, S9, S18) for detecting a wire breakage anomaly, a short-to-power anomaly, and a short-to-ground anomaly based on the level of the output terminal voltage VD detected by the level detection means (S1, S7) and the current detected by the current detection means (S14), when the pulse drive circuit 51 is turned on and off.

Abstract: The present invention provides an ignition timing control device and an ignition system which are capable of performing ignition timing control that easily suppresses occurrence of knocking for internal combustion engine. An ignition timing control device has a knocking detection device 41 detecting knocking of internal combustion engine; and an ignition timing adjustment device 43 adjusting ignition timing of internal combustion engine according to a knocking signal obtained from knocking detection device 41 and indicating knocking state and an externally-obtained signal concerning the ignition timing of the internal combustion engine. Knocking detection device 41 and ignition timing adjustment device 43 are electrically connected and formed integrally with each other.

Abstract: A particulate measurement apparatus controls a particulate sensor which includes an ion generation section (110), an exhaust gas electrification section (120), an ion trapping section (130), and a second electrode (132). The second electrode (132) is maintained at a potential repulses the ions to assist the trapping of the ions at the ion trapping section (130). The particulate measurement apparatus includes a second isolation transformer (720b) and an auxiliary electrode current measurement circuit (780). The second isolation transformer (720b) applies a voltage to the second electrode (132) through a second wiring line (222). The auxiliary electrode current measurement circuit (780) detects an auxiliary electrode current Iir flowing to the second wiring line (222). The particulate measurement apparatus determines at least one of the state of the particulate sensor and the state of the second wiring line (222) based on the auxiliary electrode current Iir.

Abstract: A particulate measurement system (10) includes an auxiliary electrode current measurement circuit (780), which can determine whether or not an auxiliary electrode current In has flowed to a second wiring line (222) as well as its magnitude. When a particulate sensor (100) is operating normally, since a second electrode (132) and a casing CS are electrically insulated from each other, no current flows to the second wiring line (222). However, when the second electrode (132) and the casing CS are electrically shorted by soot or the like, the auxiliary electrode current Iir flows to the second wiring line (222). Therefore, by providing the auxiliary electrode current measurement circuit (780), the particulate measurement system (10) can determine the state of adhesion of particulates, etc., in the particulate sensor (100), and can determine whether or not the particulate measurement system (10) is in an anomalous state.

Abstract: A particulate detection apparatus (3) controls a particulate sensor (2) for detecting the amount of particulates contained in exhaust gas and which has a pump (203) for supplying air to a detection section of the particulate sensor (2) into which the exhaust gas is introduced. The particulate detection apparatus (3) detects the flow rate of air supplied from the pump (203) to the particulate sensor (2) by a flow rate sensor (207). The particulate detection apparatus (3) maintains a consistent detection accuracy of the particulate sensor (2) based on the result of the detection by the flow rate sensor (207).

Abstract: A measurement apparatus includes a plurality of modules and a main unit for collecting measurement data output from the modules. The housing of the main unit can be carried by a user of the measurement apparatus, and the plurality of modules are removably accommodated in the housing. A CAN I/F circuit of the main unit collects the measurement data output from the module accommodated in the housing. A main CPU of the main unit outputs the collected measurement data to, for example, a personal computer connected to the main unit. An internal memory and a USB memory connected to a USB memory module store the collected measurement data.

Abstract: The present invention provides an ignition timing control device and an ignition system which are capable of performing ignition timing control that easily suppresses occurrence of knocking for internal combustion engine. An ignition timing control device has a knocking detection device 41 detecting knocking of internal combustion engine; and an ignition timing adjustment device 43 adjusting ignition timing of internal combustion engine according to a knocking signal obtained from knocking detection device 41 and indicating knocking state and an externally-obtained signal concerning the ignition timing of the internal combustion engine. Knocking detection device 41 and ignition timing adjustment device 43 are electrically connected and formed integrally with each other.

Abstract: A sensor control device including an anomaly diagnosis section. When at least one of a first NOX concentration Ip2W based on the output OP1 of a first differential amplification circuit (210) and a second NOX concentration Ip2N based on the output OP2 of a second differential amplification circuit (220) falls within an anomaly diagnosis range ZN, the difference D between Ip2W and Ip2N is obtained, and the difference D is stored in a difference accumulation buffer BF such that 16 values of the difference D continuously sampled up to the present are stored. The integrated value (difference integral value) Dint of the difference D is obtained. When the difference integrated value Dint becomes equal to or greater than a predetermined value Di0, the sensor control device indicates a diagnosis result of “anomalous.

Abstract: A sensor control apparatus connected to a gas sensor includes a microcomputer containing a ROM (first storage section), and an EEPROM (second storage section) independently of the ROM. The ROM stores an anomaly diagnosis program containing at least one type of anomaly determination process. The EEPROM stores one or more flags set so as to represent whether the corresponding anomaly determination process is valid or invalid. The states of the one or more flags can be readily changed from an externally connected PC. A CPU executes a series of processing steps of the anomaly determination processes, and then obtains a determination result thereof when the CPU determines that the anomaly determination process is valid, with reference to the one or more flags.

Abstract: In a heather control apparatus for a gas sensor, a CPU obtains upper and lower limit values by adding a predetermined value to and subtracting the predetermined value from an Rpvs average obtained in a last heater energization period (or to an Rpvs value obtained for the first time), and sets a window W1. The CPU obtains a plurality of Rpvs values [P2] to [P11], and obtains an Rpvs average A1 while excluding Rpvs values [P5], [P6], and [P9] which do not fall within the window W1 (not less than the lower limit value and not greater than the upper limit value). The CPU obtains the upper and lower limit values by adding the predetermined value to and subtracting the predetermined value from the Rpvs average A1, and sets a window W2 for the next heater energization period.

Abstract: A load drive apparatus (1) includes a pulse drive circuit (51) which applies a pulse voltage PS to a resistive load (4); current detection means (S14) for detecting the current flowing to the resistive load (4) through the pulse drive circuit (51); level detection means (S1, S7) for determining whether an output terminal voltage VD of the pulse drive circuit (51) is a high potential level or a low potential level; anomaly detection means (S8, S9, S18) for detecting a wire breakage anomaly, a short-to-power anomaly, and a short-to-ground anomaly based on the level of the output terminal voltage VD detected by the level detection means (S1, S7) and the current detected by the current detection means (S14), when the pulse drive circuit 51 is turned on and off.

Abstract: An oxygen sensor control apparatus (10) obtains a correction coefficient for calibrating the relation between oxygen concentration and an output value of an oxygen sensor (20), when a fuel cut operation of an internal combustion engine (100) is performed. The apparatus includes average output value calculation means; inter-fuel-cut average output value calculation means; and correction coefficient calculation means.

Abstract: In an oxygen sensor control apparatus, after start of fuel cut, the weighted average Ipd of corrected values obtained by multiplying the output value of a mounted oxygen sensor by a correction coefficient Kp is obtained as a representative value Ipe, representing the corrected values in the fuel cut period (S19). In the case where the number of times the representative value Ipe is continuously judged not to fall outside a second range (S21: NO) and to fall outside a first range (S23: YES) reaches 10 (a first number of times) (S26: YES), a new correction coefficient Kp is computed (S27). In the case where the number of times the representative value Ipe is continuously judged to fall outside the second range (S21: YES) reaches 4 (a second number of times smaller than the first number of times) (S29: YES), a new correction coefficient Kp is computed (S30).

Abstract: In an oxygen sensor control apparatus, after start of fuel cut, the weighted average Ipd of corrected values obtained by multiplying the output value of a mounted oxygen sensor by a correction coefficient Kp is obtained as a representative value Ipe, representing the corrected values in the fuel cut period (S19). In the case where the number of times the representative value Ipe is continuously judged not to fall outside a second range (S21: NO) and to fall outside a first range (S23: YES) reaches 10 (a first number of times) (S26: YES), a new correction coefficient Kp is computed (S27). In the case where the number of times the representative value Ipe is continuously judged to fall outside the second range (S21: YES) reaches 4 (a second number of times smaller than the first number of times) (S29: YES), a new correction coefficient Kp is computed (S30).

Abstract: A sensor control device including an anomaly diagnosis section. When at least one of a first NOX concentration Ip2W based on the output OP1 of a first differential amplification circuit (210) and a second NOX concentration Ip2N based on the output OP2 of a second differential amplification circuit (220) falls within an anomaly diagnosis range ZN, the difference D between Ip2W and Ip2N is obtained, and the difference D is stored in a difference accumulation buffer BF such that 16 values of the difference D continuously sampled up to the present are stored. The integrated value (difference integral value) Dint of the difference D is obtained. When the difference integrated value Dint becomes equal to or greater than a predetermined value Di0, the sensor control device indicates a diagnosis result of “anomalous.