Title: Device for controlling vacuum advancing of ignition timing

Abstract: A device for controlling the vacuum advancing of ignition timing including a vacuum advancer, a diaphragm valve, a first vacuum port opened to an intake passage which is positioned so as to be immediately upstream of a throttle valve when it is fully closed and downstream of the throttle valve when it is slightly opened. A second vacuum port is located absolutely downstream of the throttle valve, wherein the diaphragm valve produces a fraction of the intake manifold vacuum when the throttle valve is fully closed while it communicates therethrough the intake manifold vacuum supplied from the second vacuum port when the throttle valve is opened so as to position the first vacuum port at the downstream thereof.

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Inventors: Sawada, Daisaku (Susono, JP)
Shigematsu, Takashi (Susono, JP)
Takeda, Yuji (Susono, JP)

Application Number: 827707
Filing Date: 1977-08-25
Publication_date: 1980-04-15
Assignee: Toyota Jidosha Kogyo Kabushiki Kaisha (JP)
Primary Class(es): 123/406.69
Other Classes:
US Patent Ref:

3476094	Nov, 1969	Rucins et al.	123/117.
3699936	Oct, 1972	Vartanian	123/117.
3915136	Oct, 1975	Caldwell	123/119.
3948232	Apr, 1976	Gould et al.	123/117.
3982515	Sep, 1976	Bradshaw	123/119.
3990419	Nov, 1976	Nohira et al.	123/119.
3994269	Nov, 1976	Takaoka et al.	123/117.
3996955	Dec, 1976	Kawabata	123/117.
4009700	Mar, 1977	Engels et al.	123/119.
4022169	May, 1977	Tanaka et al.	123/117.
4031869	Jun, 1977	Onishi et al.	123/117.
4033309	Jul, 1977	Hayashi et al.	123/119.
4040401	Aug, 1977	Marsee	123/117.
4044732	Aug, 1977	Inado et al.	123/117.
4050423	Sep, 1977	Inadu et al.	123/117.
4077373	Mar, 1978	Nallano et al.	123/117.
4095568	Jun, 1978	Furukawa	123/117.

Other Refs:
Primary Examiner: Myhre, Charles J.
Assistant Examiner: Nelli, R. A.
Attorney: Stevens, Davis, Miller & Mosher