A crank angle detection device for an engine capable of achieving downsizing and enhancing appearance of the engine is provided. A crank angle detection device for an engine that includes a pulsar ring including a plurality of detection portions and rotating coaxially with a crank shaft of the engine, and a sensor detecting a passage state of the detection portions. Here, the pulsar ring is fixed to a crank web of the crank shaft. A weight for adjusting inertia balance of the crank shaft is fixed to the crank web arranged close to an end of the crank shaft in an axial direction. The weight has a shape obtained by increasing thickness of a part of the pulsar ring.

A CPU determines that misfires are occurring in a cylinder subject to determination of whether misfires are occurring when a value obtained by subtracting a rotation fluctuation amount ΔT30[n−2] from a rotation fluctuation amount ΔT30[n] is greater than or equal to a determination threshold. The rotation fluctuation amount ΔT30[n] is subject to the misfire determination. The rotation fluctuation amount ΔT30[n−2] is 360° CA earlier than the rotation fluctuation amount ΔT30[n]. When stopping fuel supply to a cylinder #1 and determining whether misfires are occurring in cylinder #4, the CPU determines whether misfires are occurring after executing a correcting process that corrects the determination threshold to a second determination threshold Δth2, which is less than a first determination threshold Δth1.

To provide a controller and a control method for internal combustion engine which can set appropriately an angle interval for estimating the combustion state in accordance with change of a burning angle interval, and can reduce calculation processing load for estimation of the combustion state. A controller for internal combustion engine changes the estimation crank angle interval based on an operating condition of the internal combustion engine; calculates an increment of gas pressure torque by burning at each crank angle of the estimation crank angle interval; and estimates the combustion state of the internal combustion engine, based on the increment of gas pressure torque by burning in the estimation crank angle interval.

Timing of HHO gas injection into a 4-stroke engine is optimized based on engine operating parameters to improve fuel economy.

A toothed wheel forming a target for a camshaft position sensor includes a circular body provided with two opposite main faces and is provided on its circumference with teeth. The series of teeth includes eight teeth, each tooth having, for a given first direction of rotation of the wheel, a rising edge and a falling edge and two neighboring teeth being separated by a recessed part. The edges of a first type, rising or falling, are evenly distributed at the periphery of the toothed wheel. The angular length of the recessed parts is greater than or equal to arctan(Llow/R)°CAM, where R is the radius and Llow is the minimum distance between two teeth to detect a low level, except for one recessed part, and the angular length of a tooth is greater than arctan(Lhigh/R)°CAM, except for one tooth, where Lhigh is the minimum length of a tooth allowing detection.

The present invention provides an engine control device that sets a cam signal read value according to a cam signal output from a cam angle sensor, in a front-rear determination position; if the cam signal read value is alternately changed between 1 (LOW) and 2 (HIGH) in the front-rear determination position, sets the cam signal read value to the cam signal expected value; if the cam signal read value is not alternately changed between 1 (LOW) and 2 (HIGH), inverts the cam signal expected value in the control cycle of the previous time, and sets the resultant cam signal expected value; then, when the cam signal read value and the cam signal expected value are equal to each other, distinguishes the cylinders by using the cam signal read value; and when the cam signal read value and the cam signal expected value are different from each other, distinguishes the cylinders by using the cam signal expected value.

A vehicle controller that in serial communication executed at a limited transmission rate, can efficiently transmit a large volume of sensor data and stably execute data processing and control is provided.

The vehicle controller includes a plurality of detectors (6, 10, 13, 19, 20, 21) that detect a plurality of operation conditions of a power generator 1, a control unit 18 that controls the power generator, based on pieces of detection data outputted from the plurality of detectors, a data collecting unit 18 that collects the pieces of detection data together, a serial communication line 17 for serially transmitting the pieces of detection data from the data collecting unit 16 to the control unit 18, and a transmission order setting unit 26 that sets a transmission order of the pieces of detection data in advance, the transmission order being an order in which the pieces of detection data are serially transmitted from the data collecting unit 16 to the control unit 18.

A control unit configured to control an electric turbocharger and an EGR valve. While an internal combustion engine is stopped, an oxygen-free period, which is a period during which oxygen surrounding an exhaust gas purifier used for an oxidation reaction runs out, is estimated based on a temperature of the exhaust gas purifier. Before entering the oxygen-free period, the EGR valve is opened and the electric turbocharger is driven. Air surrounding the exhaust gas purifier is replaced with fresh air. After replacement with the fresh air has been completed, the electric turbocharger is stopped.

The aim of the present invention is a method for synchronizing an engine comprising at least one movable piston of a four-stroke internal combustion engine, said method comprising a first step (e1) involving initializing a second memory space, a second step (e2) involving waiting for an edge on a fourth signal (CAM_TOT), a fourth step (e4) involving testing the value of a counter (CPT), an eighth step (e8) involving selecting the theoretical angular positions of the slots of the second signal (CAM_IN) relative to the edges of a first signal (CRK) and of the slots of a third signal (CAM_EX) relative to the edges of the first signal (CRK).

A classifier capable of predicting if cylinder valves of an engine commanded to activate or deactivate failed to activate or deactivate respectively. In various embodiments, the classifier can be binary or multi-class Logistic Regression, or a Multi-Layer Perceptron (MLP) classifier. The variable displacement engine can operate in cooperation with a variable displacement engine using cylinder deactivation (CDA) or skip fire, including dynamic skip fire and/or multi-level skip fire.