About 73 results
https://drivepatents.com/patents/1090772 · 2 Jan 2004
A method that uses a dither signal (38) for reducing hysteresis effect in a variable cam timing system (10) is provided. The method includes the steps of: a) providing (82) a dither signal (38) having at least two switchable frequencies; b) determining (86...
https://drivepatents.com/patents/1090779 · 2 Jan 2004
In a Variable Cam Timing (VCT) control system (40), there are conditions when the system must operate in an open-loop mode, and other situations where closed-loop operation is desired. A number of operating states is provided for VCT control system to swit...
https://drivepatents.com/patents/1090647 · 2 Jan 2004
Oil may be pumped into one or other of the working chambers to change the phase angle of the camshaft with respect to the camshaft timing gear. The first operating step (101) uses a monitoring device which determines whether the camshaft is at a given phas...
https://drivepatents.com/patents/1090770 · 2 Jan 2004
An engine with dependent intake cams (Fig. 2) requires a different method and formula to determine the phase of the intake cams (94). The exhaust camshaft (92) drives the intake camshaft (94) and so the intake cam position is dependent upon the exhaust cam...
https://drivepatents.com/patents/1091457 · 3 Dec 2003
The method involves interrupting exhaust gas recirculation (9) during rundown of an internal combustion engine (10), and replacing exhaust gases in engine cylinders (3) with fresh air during a rundown of the engine. A throttle valve placed in an intake of ...
https://drivepatents.com/patents/1091747 · 19 Nov 2003
In a failure diagnosis apparatus of a position control system (variable valve operating system) wherein a target position of a control object (camshaft) changes and an actual position of the control object is feedback-controlled to the target position. A f...
https://drivepatents.com/patents/1092296 · 29 Oct 2003
A remotely mounted 4-way valve (2) or two solenoid valves (12) (13) control a center mounted spool valve (28). In the 4-way valve embodiment, one control port (3) provides oil pressure to one end (26) of the spool valve (28) and the other control port (4) ...
https://drivepatents.com/patents/1092748 · 8 Oct 2003
An in-cylinder injection type spark-ignition internal combustion engine and a control method thereof realize a stabilized stratified-charge combustion by setting a large lift amount to an intake valve 23 when the engine 1 is cold-started and by executing a...
https://drivepatents.com/patents/1092930 · 1 Oct 2003
A system and method for controlling at least one pressure responsive device (42,44,46,48) in an engine (12) is disclosed. Each pressure responsive device (42,44,46,48) can vary a compression ratio in a respective engine cylinder (24,26,28,30). The method i...
https://drivepatents.com/patents/1093367 · 10 Sep 2003
The engine has a first valve control element (1) with a first valve actuator (3) for opening and closing the exhaust valves and a second valve control element (2) with a second valve actuator (4) exclusively for opening the inlet valves. The first valve co...