Abstract: An engine control unit includes an extracting portion acquiring a sound or vibration of an engine from external and extracting vibration components of frequency bands each of which including a resonant frequency of a vibration mode, a waveform synthesis portion synthesizing the vibration components extracted by the extracting portion to generate a synthesis vibration waveform, a calculation portion calculating a time average value by averaging the synthesis vibration waveform in a predetermined time, a peak detection portion detecting a peak strength of the vibration component of the frequency band including a lowest resonant frequency, a storage portion previously storing a first threshold and a second threshold, and a determination portion determining an existence of a knocking and whether a knock level is a first knock level or a second knock level, by comparing the time average value with the first threshold and comparing the peak strength with the second threshold.

Abstract: An electronic control device includes: a thermoelectric element module that has a plurality of thermoelectric element groups, which are connected in parallel; and a control circuit that supplies a driving power to the thermoelectric element module to perform an operation control of the thermoelectric element module. Additionally, the plurality of thermoelectric element groups respectively have a plurality of thermoelectric elements, which are connected in series. Moreover, each of the plurality of thermoelectric elements is provided with a pair of a p-type semiconductor and an n-type semiconductor. Furthermore, the plurality of thermoelectric element groups have different number of the thermoelectric elements.

Abstract: A control apparatus that controls a gas concentration sensor includes a sweep circuit, a current detection resistor, and a calculation portion. The sweep circuit supplies the gas concentration sensor with a sweep current. The calculation portion calculates impedance of the gas concentration sensor. The gas concentration sensor and the current detection resistor are sequentially connected in series along a direction from the sweep circuit to a reference voltage. The sweep circuit has a constant voltage circuit and a reference resistor. An increasing and decreasing tendency of a manufacturing variation of the reference resistor and an increasing and decreasing tendency of a manufacturing variation of the current detection resistor are identical. The calculation portion divides a product of a resistance value of the current detection resistor and a time variation of applied voltage to the gas concentration sensor by a time variation of applied voltage to the current detection resistor.

Abstract: An electronic control device has a housing and an air breathing filter assembled to a through-hole of the housing. The air breathing filter has a filter supporting member and a filter cover member. A cylindrical portion of the filter supporting member is inserted into the through-hole from an inside space of the housing, while the filter cover member is fixed to the cylindrical portion of the filter supporting member from an outside of the housing. A pushing portion is formed in a leg portion of the filter cover member for pushing a wall of the housing in a downward direction. A water-proof sealing member is interposed between an inner wall surface of the housing and a flanged portion of the filter supporting member, so that a gap between the housing and the air breathing filter is surely sealed.

Abstract: An electronic control device includes: a thermoelectric element module that has a plurality of thermoelectric element groups, which are connected in parallel; and a control circuit that supplies a driving power to the thermoelectric element module to perform an operation control of the thermoelectric element module. Additionally, the plurality of thermoelectric element groups respectively have a plurality of thermoelectric elements, which are connected in series. Moreover, each of the plurality of thermoelectric elements is provided with a pair of a p-type semiconductor and an n-type semiconductor. Furthermore, the plurality of thermoelectric element groups have different number of the thermoelectric elements.

Abstract: A base plate for a circuit board assembly, to which an electronic component is soldered, has a through-hole. A screw hole is formed in a housing, to which the base plate is fixed by screw members. Multiple screw-fixing portions are formed in an electronic device, so that each of the screw members is inserted through each of the through-holes of the base plate and fixed to the housing in each of the screw-fixing portions. Two projections are formed at a first casing of the housing in each of the screw-fixing portions, so that the base plate is in contact with the first casing at two contacting points formed by the projections. The projections are symmetrically formed with respect to a center of the screw hole.

Abstract: A control circuit includes a sweep circuit for supplying a sweep current to a gas concentration sensor, a current detection resistor for detecting a sensor current flowing in the gas concentration sensor, a calculation circuit for calculating an impedance of the gas concentration sensor based on the sensor current and an inter-terminal voltage of the gas concentration sensor, and a protective element for suppressing external noise from being applied to the sweep circuit and the calculation circuit. The sweep current is divided to flow in a first protective element and the gas concentration sensor. The sensor current is divided to flow in a second protective element and the current detection resistor. The calculation circuit calculates a loss current flowing to the first protective element or a second loss current flowing to the second protective element and calculates the sensor current based on the calculated current.

Abstract: A gas-sensor control device includes a sweep circuit, a return sweep circuit, and a control portion. The sweep circuit energizes a detection current to flow through an oxygen sensor to calculates an impedance of the oxygen sensor. The return sweep circuit energizes a neutralization current to flow through the oxygen sensor in a direction opposite to a direction of the detection current, so as to remove electricity from the oxygen sensor that is energized by the detection current. The control portion executes a detection of an off failure of the sweep circuit and the return sweep circuit, only based on a sensor voltage acquired in a time period where the neutralization current flows through the oxygen sensor, and a threshold.

Abstract: A load drive apparatus includes a switching element, a current detection circuit, a short circuit detection resistor, and a reflux diode. The switching element is placed to a high side of the inductive load, is interposed between the voltage source and the inductive load, and controls a current supplied to the inductive load. The current detection circuit is placed to a low side of the inductive load, and detects a current value of a current flowing through the low side of the inductive load. The short circuit detection resistor is interposed between the current detection circuit and a ground. The reflux diode is placed in a forward direction of the reflux diode and connects a middle point between the short circuit detection resistor and the current detection circuit with a different middle point between the switching element and the inductive load.

Abstract: An engine control unit includes an extracting portion acquiring a sound or vibration of an engine from external and extracting vibration components of frequency bands each of which including a resonant frequency of a vibration mode, a waveform synthesis portion synthesizing the vibration components extracted by the extracting portion to generate a synthesis vibration waveform, a calculation portion calculating a time average value by averaging the synthesis vibration waveform in a predetermined time, a peak detection portion detecting a peak strength of the vibration component of the frequency band including a lowest resonant frequency, a storage portion previously storing a first threshold and a second threshold, and a determination portion determining an existence of a knocking and whether a knock level is a first knock level or a second knock level, by comparing the time average value with the first threshold and comparing the peak strength with the second threshold.

Abstract: An electronic device includes a circuit board, first and second electronic components, a housing, and a heat conduction member. The first electronic component is mounted on a first surface of the circuit board, and the second electronic component is mounted on a second surface of the circuit board. The first electronic component and the second electronic component are arranged in an arrangement direction. The heat conduction member is disposed between the housing and a first component-opposite portion of the circuit board opposite to the first electronic component, and between the housing and a second component-opposite portion of the circuit board opposite to the second electronic component. The circuit board has a through hole in a formation area between the first electronic component and the second electronic component. The heat conduction member integrally covers each of the first component-opposite portion and the second component-opposite portion and the formation area of the circuit board.

Abstract: An electronic control device has a housing and an air breathing filter assembled to a through-hole of the housing. The air breathing filter has a filter supporting member and a filter cover member. A cylindrical portion of the filter supporting member is inserted into the through-hole from an inside space of the housing, while the filter cover member is fixed to the cylindrical portion of the filter supporting member from an outside of the housing. A pushing portion is formed in a leg portion of the filter cover member for pushing a wall of the housing in a downward direction. A water-proof sealing member is interposed between an inner wall surface of the housing and a flanged portion of the filter supporting member, so that a gap between the housing and the air breathing filter is surely sealed.

Abstract: A load drive apparatus includes a switching element, a current detection circuit, a short circuit detection resistor, and a reflux diode. The switching element is placed to a high side of the inductive load, is interposed between the voltage source and the inductive load, and controls a current supplied to the inductive load. The current detection circuit is placed to a low side of the inductive load, and detects a current value of a current flowing through the low side of the inductive load. The short circuit detection resistor is interposed between the current detection circuit and a ground. The reflux diode is placed in a forward direction of the reflux diode and connects a middle point between the short circuit detection resistor and the current detection circuit with a different middle point between the switching element and the inductive load.

Abstract: A control apparatus that controls a gas concentration sensor includes a sweep circuit, a current detection resistor, and a calculation portion. The sweep circuit supplies the gas concentration sensor with a sweep current. The calculation portion calculates impedance of the gas concentration sensor. The gas concentration sensor and the current detection resistor are sequentially connected in series along a direction from the sweep circuit to a reference voltage. The sweep circuit has a constant voltage circuit and a reference resistor. An increasing and decreasing tendency of a manufacturing variation of the reference resistor and an increasing and decreasing tendency of a manufacturing variation of the current detection resistor are identical. The calculation portion divides a product of a resistance value of the current detection resistor and a time variation of applied voltage to the gas concentration sensor by a time variation of applied voltage to the current detection resistor.

Abstract: A base plate for a circuit board assembly, to which an electronic component is soldered, has a through-hole. A screw hole is formed in a housing, to which the base plate is fixed by screw members. Multiple screw-fixing portions are formed in an electronic device, so that each of the screw members is inserted through each of the through-holes of the base plate and fixed to the housing in each of the screw-fixing portions. Two projections are formed at a first casing of the housing in each of the screw-fixing portions, so that the base plate is in contact with the first casing at two contacting points formed by the projections. The projections are symmetrically formed with respect to a center of the screw hole.

Abstract: A control circuit includes a sweep circuit for supplying a sweep current to a gas concentration sensor, a current detection resistor for detecting a sensor current flowing in the gas concentration sensor, a calculation circuit for calculating an impedance of the gas concentration sensor based on the sensor current and an inter-terminal voltage of the gas concentration sensor, and a protective element for suppressing external noise from being applied to the sweep circuit and the calculation circuit. The sweep current is divided to flow in a first protective element and the gas concentration sensor. The sensor current is divided to flow in a second protective element and the current detection resistor. The calculation circuit calculates a loss current flowing to the first protective element or a second loss current flowing to the second protective element and calculates the sensor current based on the calculated current.

Abstract: An electronic device includes a circuit board, first and second electronic components, a housing, and a heat conduction member. The first electronic component is mounted on a first surface of the circuit board, and the second electronic component is mounted on a second surface of the circuit board. The first electronic component and the second electronic component are arranged in an arrangement direction. The heat conduction member is disposed between the housing and a first component-opposite portion of the circuit board opposite to the first electronic component, and between the housing and a second component-opposite portion of the circuit board opposite to the second electronic component. The circuit board has a through hole in a formation area between the first electronic component and the second electronic component. The heat conduction member integrally covers each of the first component-opposite portion and the second component-opposite portion and the formation area of the circuit board.

Abstract: A gas-sensor control device includes a sweep circuit, a return sweep circuit, and a control portion. The sweep circuit energizes a detection current to flow through an oxygen sensor to calculates an impedance of the oxygen sensor. The return sweep circuit energizes a neutralization current to flow through the oxygen sensor in a direction opposite to a direction of the detection current, so as to remove electricity from the oxygen sensor that is energized by the detection current. The control portion executes a detection of an off failure of the sweep circuit and the return sweep circuit, only based on a sensor voltage acquired in a time period where the neutralization current flows through the oxygen sensor, and a threshold.