Control circuit for diesel injection system
AssigneeThe Bendix Corporation
InventorHoward E. Van Siclen, Jr.
Life of this patent
Estimating the term…
Abstract
A fuel control system for an electronically controlled fuel injected internal combustion engine, whereby fuel is injected into the cylinders for a fixed number of degrees with respect to the crankshaft rotation. A trigger pulse is fed into a tachometer circuit (32) giving a DC ramp output with respect to speed. A portion of this ramp signal is fed into a monostable circuit (31) whose output pulse duration is now speed dependent and remains constant in degrees of engine crankshaft as the speed of the crankshaft increases. By adjusting the slope of DC ramp output fed into the monostable circuit (31), the fuel "on" time may be set to any fixed number of engine crankshaft degrees desired for a particular engine.
Claims21
A system for controlling a solenoid operated fuel injector of an internal combustion engine of the type having a crankshaft which rotates during the operating cycle of the engine, said circuit comprising:
- first means for generating a trigger pulse for each operating cycle of said engine;
- and
- second means, responsive to each trigger pulse, for generating an energizing pulse to energize the injector solenoid for each operating cycle of the engine, said second means including:
- means for limiting the duration of said energizing pulse to a fixed number of degrees of engine crankshaft rotation over a preselected range of rotational speeds of said engine crankshaft, said limiting means consisting of electronic circuitry.
A system for controlling a solenoid operated fuel injector for an internal combustion engine of the type having a crankshaft which rotates during the operating cycle of the engine, said system comprising:
- means for generating a trigger pulse for each operating cycle of said engine;
- means for generating a first signal pulse in response to each trigger pulse over a preselected range of engine crankshaft rotational speeds, said first signal pulse having a duration in degrees of crankshaft angle rotation that is fixed;
- means for generating a second signal pulse in response to each trigger pulse over said preselected range of engine crankshaft rotational speeds, said second signal pulse having a duration in degrees of engine crankshaft rotation that varies as a function of the rotational speed of the engine crankshaft;
- and
- means for generating an energizing pulse to energize said fuel injector solenoid in response to each trigger pulse, said pulse generating means including:
- means responsive to each trigger pulse, for comparing the duration of said first signal pulse to the duration of said second signal pulse and generating an energizing pulse, having a duration equal to the shorter duration of said compared pulses, whereby said fuel injector is controlled in relation to the operating cycle of the engine by said energizing pulse.
A system for controlling a solenoid operated fuel injector of an internal combustion engine of the type having a crankshaft which rotates during the operating cycle of the engine, said system comprising:
- means for generating a trigger pulse for each operating cycle of said engine;
- and
- signal pulse generating means responsive to each trigger pulse for generating a signal pulse to energize the injector solenoid for each operating cycle of the engine, said signal pulse having a different and fixed duration in engine crankshaft degrees for each of a plurality of speed ranges of said engine crankshaft.
A system for controlling a solenoid operated fuel injector for an internal combustion engine of the type having a crankshaft which rotates during the operating cycle of the engine, said system comprising:
- means for generating a trigger pulse for each operating cycle of the engine;
- means for generating a reference signal pulse in response to each trigger pulse, said reference signal pulse having a first duration that corresponds to a first fixed number of engine crankshaft degrees over a first preselected range of engine crankshaft rotational speeds and a second duration that corresponds to a second and different fixed number of engine crankshaft degrees over a second and different preselected range of engine crankshaft rotational speeds;
- means for generating a control signal pulse in response to each trigger pulse over said first and second preselected ranges of engine crankshaft rotational speeds, said control pulse having a duration in engine crankshaft degrees of rotation that varies as a function of the rotational speed of the engine crankshaft;
- and
- means for generating an energizing pulse for said fuel injector solenoid in response to each trigger pulse to inject fuel into the engine for each operating cycle of the engine, said energizing pulse generating means including:
- means responsive to each trigger pulse for comparing the duration of a reference signal pulse to the duration of a control signal pulse and generating an energizing pulse, said energizing pulse having a duration equal to the shorter duration of said compared pulses, whereby when said energizing pulse is delivered to said fuel injector said fuel injector is energized.
A system for controlling a solenoid operated fuel injector in timed relation to the operating cycle of an internal combustion engine of the type having a crankshaft which rotates during the operating cycle of the engine, said system comprising:
- means for generating a trigger pulse for each operating cycle of said engine;
- means for generating a first signal pulse, in response to each trigger pulse, over a preselected range of engine crankshaft rotational speeds, said first signal pulse having a duration in degrees of crankshaft angle rotation that is fixed;
- means for generating a second signal pulse, in response to each trigger pulse, over said preselected range of engine crankshaft rotational speeds, said second signal pulse having a duration in degrees of engine crankshaft rotation that varies as a function of the rotational speed of the engine crankshaft;
- means for generating a speed signal, in response to said trigger pulse, which is a function of the rotational speed of said engine crankshaft;
- means, responsive to said speed signal, for eliminating the pulses from said second signal pulse generator above a preselected rotational speed of said engine crankshaft;
- and
- means for generating an energizing pulse for energizing said fuel injector solenoid, in response to each trigger pulse, to inject fuel into the engine for each operating cycle of the engine, said pulse generating means including:
- means, responsive to each trigger pulse and said speed signal for comparing the duration of said first signal pulse to the duration of said second signal pulse and generating an energizing pulse, said energizing pulse having a duration equal to the shorter duration of said compared pulses when there are two pulses to be compared and a duration equal to the duration of said first signal pulse when only one signal pulse is received, whereby said fuel injector is actuated when said fuel injector solenoid receives said energizing pulse.
Dependencies are inferred from the claim text.