Fuel supply control system for an internal combustion engine

Claim 2

A fuel supply system for an internal combustion engine, comprising: a trigger circuit switchable between first and second states when energized, the trigger circuit including means for developing a feedback signal in the first state, fuel supply means connected with the engine for applying fuel to the engine when enabled and for withholding fuel from the engine when disabled, the trigger circuit connected with the fuel supply means for enabling the fuel supply means to permit the application of fuel to the engine when the trigger circuit is either deenergized or in the first state and for disabling the fuel supply means to prohibit the application of fuel to the engine when the trigger circuit is in the second state, deceleration sensing means connected with the engine for providing an energizing voltage in response to deceleration of the engine, the trigger circuit connected with the deceleration sensing means to be energized by the energizing voltage, speed sensing means connected with the engine for generating a control signal having an amplitude proportional to the speed of the engine so that the control signal is at a trigger level when the engine speed is at a reference magnitude, the trigger circuit connected with the speed sensing means for switching to the second state to withhold fuel from the engine in response to energization when the control signal is above the trigger level and the feedback signal is absent at the onset of engine deceleration, the trigger circuit further connected with the speed sensing means for switching to the first state to reapply fuel to the engine and to develop the feedback signal when the control signal falls below the trigger level due to a decrease in the engine speed below the reference magnitude during engine deceleration, and the trigger circuit also connected with the speed sensing means for remaining in the first state to maintain the application of fuel to the engine in response to the presence of the feedback signal even though the control signal rises above the trigger level due to an increase in the engine speed above the reference magnitude as fuel is reapplied to the engine.

Claim 3

A fuel supply control system for an internal combustion engine, comprising: a trigger circuit including first and second transistors and a resistor, the first and second transistors each switchable between first and second conductive conditions, the resistor connected with the first and second transistors for developing a feedback signal when the second transistor is in the first conductive condition, the first and second transistors interconnected so that when the first transistor is switched to one of the first and second conductive conditions the second transistor is switched to the other one of the first and second conductive conditions when the trigger circuit is energized, the first and second transistors normally residing in tHe second conductive condition when the trigger circuit is deenergized, fuel injection means connected with the engine for applying fuel to the engine when enabled and for withholding fuel from the engine when disabled, the second transistor connected with the fuel injection means for enabling the fuel injection means to permit the application of fuel to the engine when the second transistor is in the first conductive condition and for disabling the fuel injection means to prohibit the application of fuel to the engine when the second transistor is in the second conductive condition, deceleration sensing means including a control switch connected with the engine for operation from a first position to a second position in response to deceleration of the engine, the trigger circuit connected with the deceleration sensing means for deenergization when the control switch is in the first position and for energization when the control switch is in the second position, speed sensing means connected with the engine for generating a control signal having an amplitude proportional to the speed of the engine so that the amplitude of the control signal is above a trigger level when the engine speed is above a reference magnitude and so that the amplitude of the control signal is below the trigger level when the engine speed is below the reference magnitude, the first transistor connected with the speed sensing means to switch to the first conductive condition in response to energization of the trigger circuit when the control signal is above the trigger level in the absence of the feedback signal at the onset of engine deceleration thereby to switch the second transistor to the second conductive condition to withhold fuel from the engine, the first transistor further connected with the speed sensing means to switch to the second conductive condition when the control signal falls below the trigger level as the engine speed decreases below the reference magnitude during engine deceleration thereby to switch the second transistor to the first conductive condition to reapply fuel to the engine and to develop the feedback signal and the first transistor also connected with the speed sensing means to remain in the second conductive condition in response to the presence of the feedback signal even though the control signal rises above the trigger level due to an increase in the engine speed above the reference magnitude as fuel is reapplied to the engine thereby to retain the second transistor in the first conductive condition to maintain the application of fuel to the engine.

Claim 4

A fuel supply control system for an internal combustion engine, comprising: a trigger circuit including first and second transistors and a resistor, the first and second transistors each switchable between first and second conductive conditions, the resistor connected with the first and second transistors for developing a feedback signal when the second transistor is in the first conductive condition, the first and second transistors interconnected so that when the first transistor is switched to one of the first and second conductive conditions the second transistor is switched to the other one of the first and second conductive conditions when the trigger circuit is energized, the first and second transistors normally residing in tHe second conductive condition when the trigger circuit is deenergized, fuel injection means connected with the engine for applying fuel to the engine when enabled and for withholding fuel from the engine when disabled, the second transistor connected with the fuel injection means for enabling the fuel injection means to permit the application of fuel to the engine when the second transistor is in the first conductive condition and for disabling the fuel injection means to prohibit the application of fuel to the engine when the second transistor is in the second conductive condition, deceleration sensing means including a control switch connected with the engine for operation from a first position to a second position in response to deceleration of the engine, the trigger circuit connected with the deceleration sensing means for deenergization when the control switch is in the first position and for energization when the control switch is in the second position, speed sensing means connected with the engine for generating a control signal having an amplitude proportional to the speed of the engine so that the amplitude of the control signal is above a trigger level when the engine speed is above a reference magnitude and so that the amplitude of the control signal is below the trigger level when the engine speed is below the reference magnitude, the first transistor connected with the speed sensing means to switch to the first conductive condition in response to energization of the trigger circuit when the control signal is above the trigger level in the absence of the feedback signal at the onset of engine deceleration thereby to switch the second transistor to the second conductive condition to withhold fuel from the engine, the first transistor further connected with the speed sensing means to switch to the second conductive condition when the control signal falls below the trigger level as the engine speed decreases below the reference magnitude during engine deceleration thereby to switch the second transistor to the first conductive condition to reapply fuel to the engine and to develop the feedback signal and the first transistor also connected with the speed sensing means to remain in the second conductive condition in response to the presence of the feedback signal even though the control signal rises above the trigger level due to an increase in the engine speed above the reference magnitude as fuel is reapplied to the engine thereby to retain the second transistor in the first conductive condition to maintain the application of fuel to the engine.