Abstract:
A method and an engine control system adapted for securing a vehicle are described. An engine control unit 2 uses one or more items of static digital data that are stored in a first memory. An immobiliser 3 is adapted to ensure that any item stored in the first memory is protected against unauthorised modification.
Abstract:
A fuel injector for an internal combustion engine, the fuel injector comprising an injector body, a fuel supply passage defined in the injector body, the fuel supply passage containing fuel under high pressure in use of the injector, a pressure sensor for measuring the pressure of fuel in the passage in use, wherein the pressure sensor is situated within the injector body and is separated from fuel in the passage in use, and a method of fuel injection, comprising constructing an hydraulic behaviour profile by fuel pressure measurement, using the hydraulic behaviour profile to predict fuel pressure that will prevail in a fuel injector during an injection event, and supplying a control signal to the fuel injector to control the amount of fuel injected during the injection event in accordance with the predicted fuel pressure. By predicting the fuel pressure that will prevail during an injection event, the fuel delivered during the injection event can be accurately controlled.
Abstract:
A fuel pressure regulator (1,201) for a compression ignition diesel engine. The regulator (1, 201) comprises a bore (5,205) within which is located a valve member (3,203) that is moveable from a non-regulating position to a regulating position. In a non-regulating position a first end (11,211) of the bore (5,205) is closed. In a regulating position the first end of the bore (5,205) is open. A control fuel line connection (8,208) is positioned at a second end (9,209) of the bore (5,205), such that, in use, any fuel entering the bore (5,205) through the control fuel line connection (8,208) acts upon a thrust surface (12,212) provided on the valve member (3,203) resulting in a force acting on the valve member (3,203) in a direction to open the fuel pressure regulator (1,201). There is provided an upper clearance (6,206) between the valve member (3,203) and the second end (9,209) of the bore (5,205), and a fuel spill line connection (13,213) positioned in the bore (5,205) such that, in use, any fuel entering the bore (5,205) through the fuel spill line connection (13,213) enters a region between the first end (11,211) and the second end (9,209) of the bore (5,205). A lower clearance(30,230) is provided in the bore (5,205) between the first end (11,211) and the second end (9,209), and a leak passageway is connected from a point between the lower clearance(30,230) and the second end (9,209) of the bore (5,205), and a fuel return line connection (14,214), such that, in normal operating use, a fuel flow path from the fuel spill line connection (13,213) to the fuel return line connection (14,214) is kept open when the fuel pressure regulator (1,201) is in the non-regulating position.
Abstract:
An intermediate drive assembly (1) is provided for a fuel pump (10) having a pump housing (12) provided with at least one bore (20a, 20b, 20c) for receiving the intermediate drive assembly (1) and a pumping plunger (30) which are driven, in use, in a reciprocal manner within the bore (20a, 20b, 20c) by a drive arrangement (2) so as to pressurise fuel within a pump chamber (32). The intermediate drive assembly (1) is arranged so as to cooperate between the drive arrangement (2) and the pumping plunger and comprises a tappet (34) having a base portion (38) and a side wall portion (36), and a coupling mechanism, in use for coupling the pumping plunger (30) to the base portion (38). The coupling mechanism comprises a spring seat (40) adapted to engage an end of the pumping plunger (30), and interlocking means, in use for substantially preventing relative rotation between the base portion (38) and the spring seat (40). The base portion (38) has a drive surface (5) for cooperating with the drive arrangement (2), a thrust surface (7) for cooperating with and imparting drive to the pumping plunger (30), and a recess (9), the recess (9) receiving an insert (11) formed of a material having a hardness greater than the base portion (38). The insert (11) is a clearance fit in the recess (9).
Abstract:
A method of providing electronic trim data for a fuel injection device to an engine system, the method comprising: reading an identifier associated with the fuel injection device; accessing a database containing trim data associated with the identifier; downloading the trim data for the fuel injection device; uploading the downloaded trim data to the engine system for use in controlling fuel injection device operation.