A vehicle controller includes processing circuitry configured to execute a counter updating process, first and second starting processes, and a resetting process. The resetting process includes resetting the crank counter when a crank counter has a value outside of a range corresponding to a tooth-missing portion in a case in which a magnitude of a difference obtained by subtracting a value of a pre-update crank counter from the value of the crank counter that was increased by receiving the pulse signal in the counter updating process is greater than a first threshold value corresponding to a specified angle. The resetting process further includes resetting the crank counter when the crank counter has a value within the range corresponding to the tooth-missing portion in a case in which the magnitude of the difference is greater than a second threshold value that is greater than the first threshold value.

A circuit assemblage and a method for evaluating signals of a crankshaft sensor and of a camshaft sensor of an internal combustion engine are provided, the times at which the signals occur being evaluated. A position signal of a shaft of the internal combustion engine is formed from the times. Storage units are provided which simultaneously store the occurrence times of the signals of the crankshaft sensor and the occurrence times of signals of the camshaft sensor. A decision unit is provided as to whether the position signal is formed from the occurrence times of the signals of the crankshaft sensor or from the occurrence times of the signals of the camshaft sensor.

A control device to detect abnormality of a supercharging pressure sensor accurately in an internal combustion engine equipped with a supercharger that can change a supercharging pressure by operation of an actuator. The control device operates an actuator so that a supercharging pressure measured by a supercharging pressure sensor becomes a target supercharging pressure, acquires a measured value of a flow rate of air flowing in an intake passage, and calculates an estimated supercharging pressure based on the measured air flow rate. The control device sets a first abnormality flag when a first simultaneous inequality is established, which is a simultaneous inequality evaluating magnitude correlation between the measured supercharging pressure, the target supercharging pressure and the estimated supercharging pressure, and is not established when the supercharging pressure sensor is normal.

A method for a fuel system is provided, wherein a fuel vapor canister is vented to an engine intake during a first condition, and wherein a restriction in a canister vent pathway is indicated, responsive to a change in a fuel tank pressure transducer output greater than a threshold. If the fuel tank pressure transducer output changes less than the threshold, degradation of the fuel tank pressure transducer is indicated. In this way, a fuel tank pressure transducer offset may be distinguished from a canister vent pathway restriction if a fuel tank pressure transducer indicates a significant pressure or vacuum in a fuel tank following a vehicle-off soak.

The abnormality diagnosis system comprises an air-fuel ratio control means which sets the target air-fuel ratio of exhaust gas to a first set air-fuel ratio set to a first side of a rich side or a lean side, then, when a downstream side output air-fuel ratio is at the first side, switches the target air-fuel ratio to a second set air-fuel ratio set to a second side at the opposite side from the first side. The abnormality diagnosis system calculates the time from when the target air-fuel ratio is switched to when the downstream side output air-fuel ratio starts to change toward the stoichiometric air-fuel ratio based on a differential value of the downstream side output air-fuel ratio and, when the calculated time is a predetermined time or more, judges that a dead time at the downstream side air-fuel ratio sensor is abnormal.

A method for diagnosing a failure of a fuel pressure sensor for a high-pressure pump of a GDI engine includes a data collection step of collecting information on a state of a vehicle. A sensor condition determination step determines whether data collected in the data collection step meets conditions for determining the failure of the fuel pressure sensor. A failure determination step determines whether the fuel pressure value of the pressure sensor for the high-pressure pump is greater than or equal to a first reference value, and simultaneously, whether a fuel amount learning value is greater than or equal to a second reference value.

A vehicle control apparatus assists a braking operation by using negative pressure in a negative pressure chamber generated by rotation of an internal combustion engine, automatically stops or restarts the engine if a first or second condition is satisfied, respectively. The apparatus determines whether a braking operation is performed, detects the rotational speed of the engine and the negative pressure in the negative pressure chamber using a negative pressure sensor. When a state has continued over a predetermined time while no braking operation has been detected, and the rotational speed has been over a threshold, the apparatus temporarily determine whether the sensor is abnormal, based on the negative pressure. When the sensor has been temporarily determined abnormal for a predetermined number of times, the abnormality is certainly determined to inhibit automatic stopping of the engine. The predetermined time may be changed depending whether the state has continued.

A method for detecting vehicle system faults includes receiving, with a processor, a plurality of sensor signals from one or more sensors; thresholding, with the processor, the plurality of sensor signals for each respective sensor substantially in real time; and generating, with the processor, abnormal derivative frequency values for each of the plurality of thresholded sensor signals in real time and determining an operational status of at least each of the one or more sensors based on the abnormal derivative frequency values.

Embodiments for diagnosing a humidity sensor are provided. One example method comprises adjusting an engine operating parameter based on humidity of a first gas flow measured by a humidity sensor, and indicating degradation of the humidity sensor if a humidity of a second gas flow measured by the humidity sensor is different than an expected humidity. In this way, degradation of the humidity sensor may be indicated if the humidity of the second gas flow measured by the humidity sensor is different than expected.

An apparatus for preventing a jackrabbit accident using a vehicle black box includes a jackrabbit accident prevention unit that is provided in the vehicle black box, synchronizes an accelerator position signal with a vertical synchronization signal for recording of an image to generate first jackrabbit analysis information to be transmitted to an accident record unit, combines the accelerator position signal with a throttle position signal to be transmitted to the accident record unit as second jackrabbit analysis information and to determine jackrabbit based on the second jackrabbit analysis information, and prevents the jackrabbit accident by automatically shutting off driving power to a fuel pump in the jackrabbit state, and the accident recording unit that provides horizontal and vertical synchronization signals for storing of an image to the jackrabbit accident prevention unit, maps the first jackrabbit analysis information with a recorded image, and stores the mapping result in a memory card.