Denso Corporation

Jaguar Land Rover Limited

Marconi Communications Gmbh

Jonathan Saunders

Yoshinori Maegawa

Kenichi Fujiki

Iain Watson

John Hartill

Parminder S Guraya

Bethan Wyatt

Matthew Child

Robert G Strange

Apparatus () for a hydraulic valvetrain system () comprising: a first oil retaining means(), a second oil retaining means () and an oil conveyance means () having a first end () operably connected to the first oil retaining means () and a second end () operably connected to the second oil retaining means (). The second oil retaining means () is configured to receive oil from the first oil retaining means () via the oil conveyance means (), the first oil retaining means () is configured to receive oil from the oilconveyance means () and the oil conveyance means () is configured to receive oil from the second oil retaining means ().

Apparatus and method for a hydraulic valvetrain system

In a method of monitoring for a misfire event in an internal combustion engine signals representative of engine speed are monitored for successive engine revolutions subsequent to each firing event. The monitored signals are stored (e.g., in a buffer) and processed to detect changes in the monitored speed signals. Changes in monitored speed signals that are indicative of an actual misfire event are detected and a misfire count is changed in response thereto.

Method and apparatus for misfire detection using engine cycles at least subsequent to actual misfire event

An internal combustion engine includes an exhaust system, an oxygen sensor in the exhaust system and a sensor malfunction monitor. The sensor malfunction monitor measures a rate of change of a signal from the sensor on detecting a turning point of the signal and detects a malfunction when a rate of change of the signal exceeds a threshold. Alternatively, the sensor malfunction monitor measures a response time interval starting from a point in time at which a diagnostic function begins to force an air-fuel ratio to change (e.g., from lean-to-rich or rich-to-lean) and ends at a point in time when a turning point of the signal is detected. The sensor malfunction monitor detects a malfunction when the delay time of the response time interval, or average delay time from a plurality of measured response time intervals, exceeds a time threshold.

Exhaust gas oxygen sensor monitoring

A diagnosis device calculates a lean-direction responsiveness characteristic and a rich-direction responsiveness characteristic of the exhaust gas sensor. The lean-direction responsiveness represents a responsiveness of the sensor in a case that an air-fuel ratio is controlled in such a manner as to be varied in a lean direction. The rich-direction responsiveness represents a responsiveness of the sensor in a case that the air-fuel ratio is controlled in such a manner as to be varied in a rich direction. The diagnosis device determines whether the exhaust gas sensor deteriorates based on at least one of the lean-direction responsiveness characteristic and the rich-direction responsiveness characteristic, and on a comparison result between the lean-direction responsiveness characteristic and the rich-direction responsiveness characteristic.

Deterioration diagnosis system for exhaust gas sensor

A data processing system comprising a common memory shared by a first and second data processor circuit, in which each processor circuit executes the same sequence of operational steps and each is connected to the common memory. An isolating device connected between the first data processor circuit and the common memory restricts access by the processor circuit is arranged to execute each operational step a set time period later than the second data processor circuit. A comparator compares the output signals of the two processor circuits in order to detect faulty operation but, before the comparison, the outputs of the second processor circuit are delayed by the set time period.

System for accessing shared memory by two processors executing same sequence of operation steps wherein one processor operates a set of time later than the other

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Coventry, United Kingdom

Jonathan Saunders