Patents by Inventor Amarjit S. Ghuman

Amarjit S. Ghuman has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6067946
    Abstract: A system and a method for hydraulic actuation of poppet valves. The poppet valve is opened by application of hydraulic pressure to a piston, and is closed by action of a mechanical spring. Hydraulic pressure comes from either a high pressure source of a low pressure source, the low pressure source being higher than ambient pressure. Application of hydraulic pressure is made by a pressure control device based upon signals received from an electronic controller. Hydraulic pressure is applied in a way that minimizes the power required to actuate the valve by making use of valve inertia.
    Type: Grant
    Filed: December 16, 1996
    Date of Patent: May 30, 2000
    Assignee: Cummins Engine Company, Inc.
    Inventors: Byron J. Bunker, Amarjit S. Ghuman, Rod Radovanovic, John M. Janssen
  • Patent number: 5937807
    Abstract: An exhaust valve system for an internal combustion engine including a turbocharger is provided for effectively increasing the turbocharged boost pressure at low load engine conditions thereby effectively improving engine transient response. The exhaust valve system includes an exhaust valve control device operable in a normal timing mode for permitting normal opening of one or more exhaust valves at a normal opening crank angle, and in an advanced timing mode for advancing the timing of the opening of the exhaust valve to an advanced opening crank angle prior to the normal opening crank angle while maintaining the timing of normal closing of the exhaust valves at a normal closing crank angle.
    Type: Grant
    Filed: March 30, 1998
    Date of Patent: August 17, 1999
    Assignee: Cummins Engine Company, Inc.
    Inventors: Lester L. Peters, David A. Vittorio, P. Douglas Free, Amarjit S. Ghuman, Harold G. Weber, Canden R. Nelson
  • Patent number: 5894992
    Abstract: Fuel injection rate shaping is integrated into the pressure intensification stage of a hydraulically actuated fuel injector having a pressure intensifier. In a first embodiment, the pressure intensification plunger is formed of two parts creating a damping chamber therebetween from which fluid is forced out through orifices in a lower one of the plunger parts during an initial phase of displacement of the upper part. Thus, injection will be performed initially at a lower pressure and rate, which increases once the plunger parts make contact. In a second embodiment, a throttled flow is set via a restrictor housing that telescopingly receives the upper plunger part, so that a lower injection rate occurs while fluid is bled off through a restricted flow path between the restrictor housing and the upper plunger part, and a higher injection rate is produced once a port in the upper plunger clears the restrictor housing.
    Type: Grant
    Filed: July 18, 1996
    Date of Patent: April 20, 1999
    Assignee: Cummins Engine Company, Inc.
    Inventors: Chung Y. Liu, Amarjit S. Ghuman, Benjamin M. Yen, Lester L. Peters, Edward D. Smith
  • Patent number: 5713335
    Abstract: In accordance with preferred embodiments of the invention a timing adjustment device includes a cam follower that is engaged between an overhead cam and an injector rocker arm, and is mounted on a rotatable eccentric shaft. The geometry of the eccentric shaft and cam follower is designed so that, as timing is varied by rotation of the eccentric shaft, no change is produced in the vertical height of the rocker arm when the cam shaft is on the outer base circle and the injector is bottomed, in order to assure that the "mechanical crush" of the PT type injector is constant despite changes in timing. In a first application of the timing arrangement, it is used together with a simple injector, which does not utilize a multi-plunger arrangement to form a hydraulic link, to achieve lower parasitic losses.
    Type: Grant
    Filed: June 6, 1996
    Date of Patent: February 3, 1998
    Assignee: Cummins Engine Company, Inc.
    Inventors: Julius P. Perr, Lester L. Peters, Amarjit S. Ghuman, Benjamin M. Yen, Edward D. Smith, David L. Buchanan, Yul J. Tarr, Laszlo D. Tikk, Andrew G. Stiles
  • Patent number: 4962743
    Abstract: A cam for controlling the injection rate of fuel in a fuel injection system having a four part cam profile is disclosed. The first 120.degree. is the plunger advancement segment. The next 80.degree. is the advanced dwell segment. The next 100.degree. is the plunger retraction segment and the last 60.degree. is the retracted dwell segment. The plunger advancement segment is divided into three subsegments: pre-injection stroke, injection stroke, and overtravel stroke. The pre-injection subsegment achieves minimum velocity and acceleration at the start of injection. In the injection subsegment, the cam follower acceleration is achieved as rapidly as can Hertz stress permits to increase the injection pressure and to achieve the maximum injection rate. The overtravel subsegment achieves a sharp and clean end of injection. Preferably, this cam causes injection of less than 20 mm.sup.3 of fuel per stroke during the first ten cam angle degrees of cam rotation.
    Type: Grant
    Filed: June 6, 1989
    Date of Patent: October 16, 1990
    Assignee: Cummins Engine Company, Inc.
    Inventors: Julius P. Perr, Eric Liang, Robert C. Yu, Amarjit S. Ghuman
  • Patent number: 4901531
    Abstract: A system is provided for increasing the efficiency of internal combustion engines operating at high loads and more particularly to a multi-cylinder engine in which at least one cylinder is used as the power recovery device. The waste heat generated during operation of the engine is utilized for producing an amount of energy to perform the work by means of a Rankine cycle.
    Type: Grant
    Filed: January 29, 1988
    Date of Patent: February 20, 1990
    Assignee: Cummins Engine Company, Inc.
    Inventors: Isoroku Kubo, Amarjit S. Ghuman