Internal-combustion engines – Engine speed regulator – Idle speed control
Patent
1990-01-23
1991-01-22
Dolinar, Andrew M.
Internal-combustion engines
Engine speed regulator
Idle speed control
F02D 4116
Patent
active
049862367
ABSTRACT:
An idle speed control apparatus for controlling the idle speed of an internal combustion engine includes a main inlet air passage, a throttle valve positioned in the main air passage, a bypass air passage connected to the main air passage and bypassing the throttle valve, a control valve positioned in the bypass air passage, and an auxiliary bypass air passage which bypasses both the throttle valve and the control valve. The control valve is responsive to a control signal to control air flow in the bypass air passage and regulate the idle speed of the engine. A manually operable mechanism is provided in the auxiliary air passage for manually controlling air flow therethrough and adjusting the engine idle speed. A first control signal causes the control valve to maintain the idle speed within a normally desired range. To facilitate manual adjustment of the idle speed, an arrangement is provided which permits manual generation of a selection signal indicating that manual adjustment of the idle speed is desired. A second control signal is produced in response to the selection signal and causes the control valve to maintain the idle speed within a reduced range which is substantially smaller than the normally desired range.
REFERENCES:
patent: 4364347 (1982-12-01), Miyagi
patent: 4617890 (1986-10-01), Kabayashi et al.
Dolinar Andrew M.
Suzuki Jidosha Kogyo Kabushiki Kaisha
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