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:
Mar. 16, 2010
Filed:
Dec. 19, 2007
Mark Allen Zurawski, Northville, MI (US);
Mark Allen Zurawski, Northville, MI (US);
Detroit Diesel Corporation, Detroit, MI (US);
Abstract
A method for diagnosing an air intake throttle with a spring activated throttle actuator, on an electronic controlled internal combustion engine system including an electronic control unit (ECU) with memory, a battery electrically connected to said engine and an ignition switch for connecting said battery to said engine and supplying current, comprising engaging the ignition switch to close a circuit between said battery and said engine; applying a first predetermined voltage to an air intake throttle plate actuator and determining a first period of throttle response time elapsed from a full open throttle position to a full close throttle position for a first throttle velocity; discontinuing application of said first predetermined voltage to said air intake throttle actuator and determining a second period of throttle response time elapsed from a full close throttle position to a full open throttle position for a second throttle velocity; applying a second voltage to said air intake throttle plate actuator and determining a third period of throttle response time elapsed from a full open throttle position to a full close throttle position for a third throttle velocity; and determining a fourth period of throttle response time elapsed from a full close throttle position to a full open throttle position with no voltage applied to the throttle plate actuator for a fourth throttle velocity.