A method and a device for performing diagnostics on a vehicle. The diagnostic system includes a sensor configured to sense an operating speed of an engine of the vehicle, a diagnostic output device, and an electronic processor. The electronic processor is communicatively coupled to the sensor and the diagnostic output device. The electronic processor is configured to activate and deactivate a decompression mode of the engine. The electronic processor acquires the operating speed of the engine from the sensor and determines an engine roughness based on the operating speed of the engine. When the engine roughness is below a threshold, the electronic processor sends a diagnostic signal to the diagnostic output device.

To show an image with minimal sense of discomfort felt by an occupant without quickening an updating cycle of an on-screen image, a virtual data generator making up a vehicle meter indicator device generates virtual data based on an arbitrary engine rotation speed between an engine rotation speed proportional to an image currently shown on a liquid crystal display device and a latest engine rotation speed rather than display data based on the latest engine rotation speed immediately before updating if the engine rotation speed declines. This allows the liquid crystal display device to show the generated virtual data on a liquid crystal panel as a virtual image for updating.

A method and a device for performing diagnostics on a vehicle. The diagnostic system includes a sensor configured to sense an operating speed of an engine of the vehicle, a diagnostic output device, and an electronic processor. The electronic processor is communicatively coupled to the sensor and the diagnostic output device. The electronic processor is configured to activate and deactivate a decompression mode of the engine. The electronic processor acquires the operating speed of the engine from the sensor and determines an engine roughness based on the operating speed of the engine. When the engine roughness is below a threshold, the electronic processor sends a diagnostic signal to the diagnostic output device.

Process for identifying edges on a camshaft target (30) having a plurality of teeth on the periphery thereof, the plurality of teeth forming a series of M edges when the camshaft rotates through one revolution, the process including the following steps: calculating, for each of the M edges, the characteristic: $\mathrm{CP}\left(j\right)={[\frac{\underset{i=1}{\overset{N}{.Math.}}P\left(j-i+1\right)+\underset{i=3N}{\overset{4N-1}{.Math.}}P\left(j-i\right)}{\underset{}{\overset{}{.Math.}}}}_{}$

A camshaft assembly includes a cam carrier and a camshaft that is rotatable relative to the cam carrier in a first configuration and fixed against rotation in a second configuration. The assembly further includes a cam target wheel that includes notches, a first and second half-wheel, and a groove. The assembly additionally includes a camshaft position sensor holder that includes a camshaft sensor bore that provides access to the groove. Also, the assembly includes a camshaft position sensor received in the camshaft sensor bore in the first configuration. Moreover, the assembly includes a locking mechanism received in the camshaft sensor bore in the second configuration. The locking mechanism includes an engagement member configured to selectively engage the groove for locking the camshaft into position relative to the cam carrier.

A combustion speed, for example, is estimated or evaluated, with a required accuracy, more simply than the conventional art, while reducing man-hours to produce a heat generation rate waveform of an internal combustion engine. An increase rate of a heat generation rate relative to a change in a crank angle in a heat generation rate increasing period (e.g., a first-half combustion period a) in which the heat generation rate increases after ignition of an air-fuel mixture is defined as a heat generation rate gradient b/a that is one of characteristic values of the heat generation rate waveform. The heat generation rate gradient is estimated based on a fuel density (e.g., fuel density .sub.fuel@dQpeak at heat generation rate maximum time) at a predetermined time set in advance in the heat generation rate increasing period so as to produce the heat generation rate waveform using the estimated heat generation rate gradient.

An ERM method is provided that uses a mode of priority, when engine monitoring is performed during a key on. In addition, engine stall and RPM sudden increase are determined based on a revolution per minute (RPM) of an engine. A storage priority decision of a first D_RPM Data associated with the engine stall and a second D_RPM Data associated with the RPM sudden rise is performed and a prioritized one of the first D_RPM Data and the second D_RPM Data is stored as new data of an engine RPM monitoring data memory 30. Further, utilization of ERM data memory is increased by deleting previously stored data, and in particular, second D_RPM Data B1-B10 and first D_RPM Data A1-A10 subdivided after and before the RPM sudden increase and after and before the engine stall are used to more accurately determine causes of the engine stall.

Disclosed is a hybrid power system including a computing core, a power converter, a driving motor, an engine generator, a charging stand, and a battery pack. The power converter is coupled to the computing core. The driving motor is coupled to the power converter. The engine generator is coupled to the power converter. The charging stand is coupled to the power converter. The battery pack is coupled to the power converter. When inputting a required torque to the computing core and switching to a charging mode, an electric energy source is coupled to the charging stand and provides power to the battery pack through the power converter. The computing core executes an optimal power allocation algorithm.

A motor-monitoring device according to one embodiment of the present disclosure, which allows easy ascertaining of the status of a motor, comprises: a rotation speed acquisition unit that acquires the rotation speed of a motor operating according to an operating program; a history information storage unit that stores history information including the rotation speed at fixed time intervals; and a graph display unit that plots markers indicating the rotation speed in a graph region with one axis used for time and the other axis for rotation speed, the graph display unit changing the mode of the marker according to a prescribed index.

A rotary member inspection method of inspecting a rotation operation of a rotary member configured to rotate about a rotation shaft includes: causing the rotary member to perform forward rotation and thereafter perform reverse rotation; acquiring one or both of a difference value between a rotating torque at a time of the forward rotation of the rotary member and a rotating torque at a time of the reverse rotation of the rotary member, and an inertia force at a time of switching from the forward rotation to the reverse rotation of the rotary member; and determining whether a rotation failure of the rotary member is present based on one or both of the acquired difference value and the acquired inertia force and a threshold set in advance.