Abstract: A common electrode driver includes an inverting amplifier including a first resistor, a second resistor, and an operational amplifier, and a resistance ratio adjustment circuit that adjusts, in accordance with a length of one horizontal scan period, a resistance ratio being a ratio of a resistance value of the second resistor to a resistance value of the first resistor. A feedback voltage is provided to one end of the first resistor. The resistance ratio adjustment circuit sets the resistance ratio when second driving is performed, in which a length of one horizontal scan period is a second time longer than a first time, to be smaller than the resistance ratio when first driving is performed, in which a length of one horizontal scan period is the first time.

Abstract: An O2-sensor fault diagnosis apparatus and method therefor, which are capable of detecting wire breaking of an O2-sensor with reliability and successively performing fault diagnosis with minimal effect on an exhaust gas. An O2-sensor 19 detects concentration of oxygen contained in an exhaust gas of an engine 1. An ECU 20 controls a quantity of fuel supplied to the engine 1 through feedback control according to an output signal of the O2-sensor. A fault diagnosis portion changes an input resistance value of an input circuit that is connected to the O2-sensor 19 and constitutes the ECU 20 each time a control condition for determining that the O2-sensor 19 is in an inactive state is satisfied, determines that wire breaking occurs in the O2-sensor 19 only if the output voltage of the O2-sensor 19 exceeds a predetermined voltage, and activates an informing portion to send a notice showing that there is a fault in the O2-sensor 19.

Abstract: An abnormality detector for motor drive system easily detects, using a CPU, abnormality such as short circuit or disconnection in magnetic field coils of a motor, wiring, an open/close element, etc., which are controlled by a microprocessor (CPU). The open/close elements conducting an open/close operation sequentially in response to pulse outputs P1, P2 generated by the CPU, drive the magnetic field coils. Surge voltages generated upon interrupting the mentioned open/close elements are OR connected through a diode, and input to a temporary storage circuit. Then the CPU reads out, stores and resets the surge voltages using pulse edges of the pulse output P1 or P2. When any generation of the surge voltage is not stored in the temporary storage circuit, the CPU operates an abnormality alarm display.

Abstract: An engine control device includes a reference voltage memory device (21) for memorizing reference voltage VAFS_STD of AFS (9) for controlling an engine (1) under a normal state, a comparing device (22) for comparing an output voltage VAFS from the AFS (9) when the engine (1) is stopped with the reference voltage VAFS_STD, and calculating a deviation &Dgr;VAFS, and a corrections device (23) for correcting the output voltage VAFS from the AFS (9) (based on the deviation &Dgr;VAFS so that the output voltage VAFS becomes the reference voltage VAFS_STD; A fuel injection quantity Tinj is calculated based on the output voltage VAFS_OBJ from the sensor obtained by the correction device (23), so that engine stall caused by failure of the sensor for controlling the engine is avoided.

Abstract: An abnormality detector for motor drive system easily detects, using a CPU, abnormality such as short circuit or disconnection in magnetic field coils of a motor, wiring, an open/close element, etc., which are controlled by a microprocessor (CPU). The open/close elements conducting an open/close operation sequentially in response to pulse outputs P1, P2 generated by the CPU, drive the magnetic field coils. Surge voltages generated upon interrupting the mentioned open/close elements are OR connected through a diode, and input to a temporary storage circuit. Then the CPU reads out, stores and resets the surge voltages using pulse edges of the pulse output P1 or P2. When any generation of the surge voltage is not stored in the temporary storage circuit, the CPU operates an abnormality alarm display.

Abstract: To obtain a fault diagnostic apparatus of an evaporation purge system by which a fault detection of a purge vent valve can accurately be performed with no wrong judgment.

Abstract: An engine control device comprising a reference voltage memory means 21 for memorizing reference voltage VAFS_STD of AFS9 for controlling an engine 1 under a normal state, a comparing means 22 for comparing an output voltage VAFS from the AFA9 when the engine 1 is stopped with the reference voltage VAFS_STD and operating a deviation &Dgr;VAFS, and a corrections means 23 for correcting the output voltage VAFS from the AFS9 based on the deviation &Dgr;VAFS so that the output voltage VAFS becomes the reference voltage VAFS_STD, wherein a fuel injection quantity Tinj is operated based on the output voltage VAFS_OBJ from the sensor obtained by the correction means 23, whereby engine stall caused by failure of the sensor for controlling the engine is avoidable.

Abstract: To obtain a fault diagnostic apparatus of an evaporation purge system by which a fault detection of a purge vent valve can accurately be performed with no wrong judgment.

Abstract: An O2-sensor fault diagnosis apparatus and method therefor, which are capable of detecting wire breaking of an O2-sensor with reliability and successively performing fault diagnosis with minimal effect on an exhaust gas. An O2-sensor 19 detects concentration of oxygen contained in an exhaust gas of an engine 1. An ECU 20 controls a quantity of fuel supplied to the engine 1 through feedback control according to an output signal of the O2-sensor. A fault diagnosis portion changes an input resistance value of an input circuit that is connected to the O2-sensor 19 and constitutes the ECU 20 each time a control condition for determining that the O2-sensor 19 is in an inactive state is satisfied, determines that wire breaking occurs in the O2-sensor 19 only if the output voltage of the O2-sensor 19 exceeds a predetermined voltage, and activates an informing portion to send a notice showing that there is a fault in the O2-sensor 19.

Abstract: An omnidirectional camera device is able to restrict a range in which images of objects are picked up. This omnidirectional camera device comprises a rotationally-symmetric convex mirror (24) fixedly attached to one end of a transparent tube assembly (20), an image pickup means (32) disposed on the other end of the tube assembly in an opposing relation to this convex mirror and a cover assembly (60) disposed on the tube assembly for restricting the range in which light becomes incident on the convex mirror. The cover assembly is mounted on one end side of the tube assembly. The cover assembly is a shielding cover assembly and includes a cover member (60B). The cover assembly is attached to the tube assembly so as to become freely rotatable. The direction and the range in which images of objects should be picked up may be adjusted by the attachment position of the cover assembly and a shielding angle &agr; of the cover assembly.

Abstract: An O.sub.2 -sensor fault diagnosis method and apparatus for detecting a fault of an O.sub.2 -sensor when a feedback control of a fuel supply to an engine is performed by making use of the output of an O.sub.2 -sensor and detecting and identifying a fault of the O.sub.2 -sensor even in the case where the feedback control is invalidated. A microcomputer (24) receives an output of an O.sub.2 -sensor (19) for detecting concentration of oxygen contained in an exhaust gas of an internal combustion engine (1). An ECU (20) controls a quantity of fuel supplied to the internal combustion engine (1) through feedback control in dependence on an output signal of the O.sub.2 -sensor (19). A first decision circuit is provided for deciding whether or not the O.sub.2 -sensor (19) exhibits abnormality on the basis of the output signal state of the O.sub.