Abstract: An abnormality detection device includes a load connected to a load connection terminal; a first switching element, having one end connected to the load connection terminal, that switches between connection and disconnection of a power supply to the load; a control unit that switches between an on state and an off state of the first switching element; a detection unit that outputs a signal based on comparison between a voltage of the load connection terminal and a predetermined reference voltage; an acquisition unit that acquires the signal from the detection unit; a determination unit that determines that the load is in an abnormal state when the acquisition unit acquires an abnormality detection signal, which is a signal of a predetermined level, continuously for more than a predetermined first determination time period after the control unit switches the first switching element from the on state to the off state.

Abstract: An electronic control unit monitors a state of a monitor target based on an analog signal from a sensor which is supplied with electric power and which outputs the analog signal that changes in accordance with a value of the electric power and the state of the monitor target. The electronic control unit includes a first power supply, a second power supply having higher accuracy than the first power supply, and a controller. The controller supplies the power to the sensor with the first power supply and determines whether there is a change in the state of the monitor target based on the analog signal. When determining that there is the change, the controller switches over a power supply from the first power supply to the second power supply and determines whether there is a change in the state of the monitor target.

Abstract: An abnormality detection device includes a load connected to a load connection terminal; a first switching element, having one end connected to the load connection terminal, that switches between connection and disconnection of a power supply to the load; a control unit that switches between an on state and an off state of the first switching element; a detection unit that outputs a signal based on comparison between a voltage of the load connection terminal and a predetermined reference voltage; an acquisition unit that acquires the signal from the detection unit; a determination unit that determines that the load is in an abnormal state when the acquisition unit acquires an abnormality detection signal, which is a signal of a predetermined level, continuously for more than a predetermined first determination time period after the control unit switches the first switching element from the on state to the off state.

Abstract: An electronic control unit monitors a state of a monitor target based on an analog signal from a sensor which is supplied with electric power and which outputs the analog signal that changes in accordance with a value of the electric power and the state of the monitor target. The electronic control unit includes a first power supply, a second power supply having higher accuracy than the first power supply, and a controller. The controller supplies the power to the sensor with the first power supply and determines whether there is a change in the state of the monitor target based on the analog signal. When determining that there is the change, the controller switches over a power supply from the first power supply to the second power supply and determines whether there is a change in the state of the monitor target.