The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 08, 2002
Filed:
Aug. 04, 2000
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
In a high-pressure fuel pump of a fuel supplying apparatus, the amount of movement of a plunger (cam speed) occurring during a unit-angle rotation of a cam changes in accordance with the phase of the cam. The amount of fuel delivered from the high-pressure fuel pump is controlled by changing the start timing of closure of an electromagnetic spill valve. However, the amount of fuel delivered is greatly affected by the cam speed at the start of closure of the spill valve. Therefore, for example, a cam profile of the cam is set such that the closure start timing of the electromagnetic spill valve that provides a maximum amount of fuel that needs to be delivered for fuel injection is placed within a predetermined cam angle range in which the change in the cam speed with respect to changes in phase of the cam is constant. Therefore, the changing of the closure start timing of the electromagnetic spill valve for the purpose of adjusting the amount of fuel delivered is performed within the predetermined cam angle range.