An emission control system especially for light duty diesel engines has a first catalyst, 2, positioned upstream of a second catalyst, 3. The first catalyst converts NO to NO.sub.2 and the second catalyst oxidises HC, CO and VOF. The tendency of the second catalyst to collect soot particles is reduced by combustion of the soot particles by NO.sub.2 from the first catalyst.

A control method for controlling the fuel pressure within the common rail or accumulator of a fuel system whilst an associated engine is operating, the fuel system including a plurality of individually actuable fuel injectors arranged to receive fuel from the common rail, each injector including a control valve operable to control the fuel pressure within a control chamber, fuel escaping from the control chamber being returned to a fuel reservoir, the method comprising: monitoring the fuel press...

The control knob includes an aperture with a D-shaped cross section. The aperture is formed by a relatively rigid planar portion and an arcuate portion which further includes a relatively flexible inner concentric portion and a relatively rigid flexible outer concentric portion. The relatively flexible inner concentric portion is attached to the relatively rigid planar portion by living hinges and further includes outwardly pointing stop bumps. The outwardly pointing stop bumps are spaced from s...

A chair control is shown for adjusting the horizontal position of a chair armrest or a chair back. A support bar, upon which the chair armrest or back is mounted, a slidably located in a mounting bracket usually attached to the underside of the chair seat. The mounting bracket includes a first pivot pin spaced transversely of the support bar, and a rigid lever mounted on this pivot pin, the pivot pin acting as a fulcrum. The rigid lever includes a first end portion that pivots into locking engag...

A method of enabling a functional option in a computer type system is comprised of storing a serial number which is specific to the system, storing different codes each corresponding to a possible functional option which can be enabled in the system, selecting codes corresponding to desired functional options, combining the selected codes and the serial number to obtain a combined option code, receiving a password for enabling functional options corresponding to the selected codes, processing th...

The invention relates to a method of combating an animal parasite in a host which comprises delivering an anti-parasitic protein to the parasite or to a locus thereof by administering the protein to the host animal as a medicament or as a food. The anti-parasitic protein may be an inhibitor of an enzyme of the parasite, for example an inhibitor of a digestive enzyme such as a cysteine protease inhibitor. The parasite may be a helminth or a protozoan, for example, a nematode. According to one emb...

A control circuit for controlling a current switch to provide current to a load circuit, includes a hysteresis trigger circuit arranged to selectively switch on the current switch in dependence upon a control signal. A transistor is arranged to selectively provide an operating current to the hysteresis trigger circuit in dependence upon the control signal. In this way operating current is only supplied to the hysteresis trigger circuit when the control signal is high, such that the load circuit ...

The invention concerns a control valve with a housing, having a pump connection, a tank connection device, a working connection device and a load pressure connection device, each connected with an opening device in a control surface, and with a slide, arranged movably in the housing and co-operating with the control surface, the slide having grooves and/or channels, so that it connects or separates predetermined opening devices with/from each other. In such a control valve the tightness must be ...

A control module assembly (200) for mounting as a unit to the housing (116) of a compound transmission (110). The module assembly includes a module housing (202) defining electric (207) and fluid (208) connectors and having an interior containing a position sensor (218) interacting with a transmission shift shaft (188), cavities (212 and 214) defining auxiliary section actuator piston cylinders (204B and 206B), solenoid control valves, a printed circuit board, and various interior electric and f...

A novel encoding system and methods for determining the location and/or identity of a particular item or component of interest is provided. In particular, the present invention utilizes a "barcode" comprising one or more sizes of semiconductor nanocrystals (quantum dots) having characteristic spectral emissions, to either "track" the location of a particular item of interest or to identify a particular item of interest. The semiconductor nanocrystals used in the inventive "barcoding" scheme can ...