Abstract: A two stage intensifier capable of multiple intensification rates comprises a stepped top portion and a shoulder portion, each being actuated by separate fluid passages. A stepped top portion is received into an upper bore of a piston bore and a shoulder is received into a lower bore. The stepped top forms a seal with the upper bore to prevent direct fluid communication between a first actuation cavity above the stepped top and a second actuation cavity above the shoulder.

Abstract: A filter assembly with a replaceable filter element and a reusable filter housing, which incorporates a locking mechanism to ensure that the filter system will not be operated without a filter element installed.

Abstract: The oil quality used in a machine, vehicle or system can be determined in response to determining a temperature and pressure within an oil supply. Once the oil quality is determined, an oil quality warning light can be activated, indicating the need to change the oil.

Abstract: A compression release brake system for an internal combustion engine is selectively operable in different modes that provide lower levels of noise emissions at lower levels of vehicle retarding. Lower noise levels are achieved by advancing or otherwise modulating the timing of brake events, thereby reducing cylinder pressure during release and thus reducing noise levels. A system is provided on board the vehicle to determine when the vehicle is operating in a noise restricted region and automatically switch to a braking mode that produces lower, acceptable levels of noise emissions. GPS or other sensors may be used to determine when the vehicle is operating in a restricted region.

Abstract: A method and system of fuel injector operation is provided in which the electronic control module (ECM) reduces the number of injection signals sent to the fuel injectors. Specifically, the ECM selects certain injectors to perform a post injector during a specific engine cycle and increase the quantity of fuel injected by the selected injectors to compensate for the other injectors that are not performing post injections during that engine cycle.

Abstract: The present invention provides a method and system to control emissions in an engine by controlling spray plume characteristics, such as length and angle. Specifically, a system implementing the present invention includes an fuel injector, an engine cylinder and an electronic control module (ECM). The ECM determines spray plume parameters, including time from start of injection, nozzle hole diameter, pressure differential between the cylinder and fuel in the fuel injector nozzle, and gas temperature and density in the cylinder. Upon determining the spray plume parameters, the ECM calculates the spray plume characteristics and compares them to the optimal spray plume characteristics. The ECM then proceeds to adjust fuel injection characteristics, such as injection on time, rail pressure, and injection timing relative to piston position, to optimize the spray plume.

Abstract: A valve using a pressure control cavity to control valve position can implement a pressure to sensor to determine the pressure within the control cavity to determine whether pressure is presently acting upon the valve. The pressure sensor can provide a feedback signal to a control module allowing the control module to control timing of the valve.

Abstract: A method and apparatus for trimming a fuel injector that delivers multiple injections or injection segments per engine cycle is provided. Trimming a fuel injector comprises determining a first fuel quantity to be delivered by the plurality of injectors, partially suspending fuel delivery by one selected injector, determining a second fuel quantity, and determining a fuel characteristic of the selected injector in response to the first and second fuel quantities.