Engine control method for protecting the engine during reverse rotation, and involving the following steps: when a first prediction of the engine speed at a next top dead center is below a predetermined lower threshold, inhibiting the next combustion for this cylinder of the engine, and when the first prediction of the engine speed is between the predetermined lower threshold and a predetermined upper threshold, and the engine reaches a second measurement predetermined angular position which is subsequent to the first measurement position, activating the prediction means again in order to obtain a second prediction of the engine speed at the next top dead center.

Disclosed is a method for synchronizing a combustion engine of a motor vehicle, including the steps of detection of the reference position of a first toothed wheel during a rotation of the crankshaft from the measurements sent by a first measuring sensor, detection of rising and falling edges of the teeth of a second toothed wheel during a concomitant rotation of the camshaft from the measurements sent by a second measuring sensor, identification of the detected edges with a first tolerance threshold on the angular position of the camshaft from recorded positions of the edges to synchronize the engine, the recorded positions being predetermined by learning from theoretical positions with a second tolerance threshold on the angular position of the camshaft, the first tolerance threshold being less than the second tolerance threshold, and synchronization of the engine from the identified edges of the teeth of the second toothed wheel.

A control system includes a controller. The controller counts the number of driving times of the high pressure fuel pump, which is the number of the reciprocating motions of the plunger based on a crank counter that is counted up at every predetermined crank angle. The controller stores a map in which a top dead center of the plunger is associated with a crank counter value, and store a crank counter value while an engine is stopped as a stop-time counter value. The controller calculates, referring to the map, the number of the crank counter values corresponding to the top dead center of the plunger between a crank counter value and the stop-time counter value, and set a calculated number as the number of driving times.

A method for synchronizing an internal combustion engine includes: a) a first step of acquiring, by the camshaft sensor, signals corresponding to at least five cam edges x; b) a second step of determining the value, from the camshaft signal, of a first, second and third actual ratio; c) a third step of establishing, for each actual value ratio obtained in b), a list of possible cam edges x by comparing the values of the first, second and third actual ratios, respectively, with a tolerance window corresponding to a value of a first, second or third theoretical ratio for a given cam edge x, each weighted by a tolerance factor k; and d) a fourth step of determining the cam edge x seen by the camshaft sensor, the cam edge actually seen by the sensor corresponding to the cam edge x common to the three lists established in c).

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 method for increasing a resolution of a magnetic sensor for an internal combustion engine of a motor vehicle. The sensor delivers an electrical synchronization signal having successive, spaced-apart crenels, one of the rising or falling edges of which corresponds to a respective angle of rotation of the element of the engine. A synchronization voltage range is interposed between an upper voltage modulation range above and a lower voltage modulation range below the upper and lower voltage of the synchronization range, respectively, the electrical signal in each of the lower and upper modulation ranges being modulated so as to include additional crenels, which are supplementary to the crenels of the synchronization signal, corresponding to periodic clock crenels with a period dependent on engine speed, an angle of rotation being identified by one of the rising or falling edges of each additional crenel.

When a start request for an internal combustion engine is made with 1) a clutch disconnected, 2) a crankshaft rotating at a specified rotation speed or greater, and 3) fuel injection by an injector stopped, a controller for a vehicle executes: a first process that identifies, from the cylinders, a target cylinder that is in a compression stroke when the request is made; a second process that calculates a requested injection position based on the rotation speed; a third process that calculates, as a start crank position, a rotation position of the crankshaft advanced from the requested injection position by a specified rotation amount; and a fourth process that outputs a command signal that instructs a target injector to inject fuel at the crank position only if the rotation position of the crankshaft obtained when the request is made is advanced from the crank position.

Disclosed is a method for processing signals from a crankshaft sensor including the following steps: detection of a stopping of the engine; simulation and transmission of a backwards-running square waveform; and simulation and transmission of a forwards-running square waveform. Also disclosed is a processing module configured to implement such a method.

An engine synchronization method may include: detecting teeth numbers of crank teeth installed on a crankshaft based on a pulse signal generated from a crankshaft position sensor; calculating a tooth period between a falling edge and a next falling edge of the pulse signal generated from the crankshaft position sensor and detecting a missing tooth based on the calculated tooth period; determining whether the detected missing tooth is an actual missing tooth based on a tooth number detected at the time of detecting the missing tooth; and performing synchronization control of an engine when it is determined that the detected missing tooth is the actual missing tooth.

A method for managing start up of a four-stroke engine, the method being performed by a controller communicatively connected to the engine. The method includes determining, using a crankshaft sensor, an angular orientation of the crankshaft, the crankshaft being rotated by a starter motor prior to ignition of the engine; determining, using the crankshaft sensor, at least one engine speed variation as the crankshaft rotates through at least one measurement window; and identifying a working cycle phase of the crankshaft including in response to an absolute value of the at least one engine speed variation being above a threshold, determining that the crankshaft is in an ignition revolution of a two revolution working cycle of the engine in the measurement window, subsequent ignition of the engine being based on determination of the angular orientation and the working cycle phase of the crankshaft.