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:
Jun. 29, 1976
Filed:
Dec. 19, 1974
Noriaki Kawai, Okazaki, JA;
Toyota Jidosha Kogyo Kabushiki Kaisha, Toyota, JA;
Abstract
An ignition timing control apparatus for an internal combustion engine which includes two diaphragms, each of which is selectively connected through a change-over valve to a respective one of two vacuum ports in the passage of carburetor. One of the ports is just above the upper edge of a throttle valve in the fuel passage when the throttle valve is in its engine idling position. The other port is upstream of the one port and is adjacent the upper edge of the throttling valve when the engine is in a partly loaded condition. The change-over valve is controlled in response to the temperature of the engine cooling water. When the engine is cold-operation or warming-up, one of the diaphragms communicates with one of the vacuum ports through the change-over valve to advance the ignition timing in response to the vacuum in the passage of carburetor; and when the engine is in a condition other than cold-operation or warming-up, the other diaphragm communicates with the other vacuum port through the change-over valve to advance ignition timing in response to the vacuum, which under low and high load conditions may be approximately atmospheric pressure, in the fuel passage.