Fuel injection control method for an internal combustion engine

Claim 2

A fuel injection control method for an internal combustion engine, having a crankshaft in a crankcase, a cylinder with a spark plug, a generator provided in said crankcase for generating power to said spark plug, an injector provided in an intake manifold for injecting an amount of fuel into said cylinder, a throttle sensor for detecting an opening degree of a throttle valve and for generating a degree signal, an atmospheric pressure sensor for sensing an atmospheric pressure, and a pressure sensor provided in a fuel supply line for detecting a fuel pressure and for generating a pressure signal, an improvement of the method which comprises the steps of: comparing said pressure signal with a predetermined pressure value in accordance with operating conditions of said engine; decreasing said amount of fuel when said pressure signal is higher than said predetermined pressure value; and increasing said amount of fuel when said pressure signal is lower than said predetermined pressure value.

Claim 3

A fuel injection control method for an internal combustion engine, having a crankshaft in a crankcase, a cylinder with a spark plug, a generator provided in said crankcase for generating power to said spark plug, an injector provided in an intake manifold for injecting an amount of fuel into said cylinder, a throttle sensor for detecting an opening degree of a throttle valve and for generating a degree signal, an atmospheric pressure sensor for sensing an atmospheric pressure, and a pressure sensor provided in a fuel supply line for detecting a fuel pressure and for generating a pressure signal, an improvement of the method which comprises the steps of: comparing said pressure signal with a predetermined pressure value in accordance with operating conditions of said engine: decreasing said amount of fuel when said pressure signal is higher than said predetermined pressure value; and stopping said engine either by cutting said power to said spark plug or by cutting said fuel when said pressure signal is lower than said predetermined pressure value.

Claim 4

A fuel injection control method for an internal combustion engine, having a crankshaft in a crankcase, a cylinder with a spark plug, a generator provided in said crankcase for generating power to said spark plug, an injector provided in an intake manifold for injecting an amount of fuel into said cylinder, a throttle sensor for detecting an opening degree of a throttle valve and for generating a degree signal, an atmospheric pressure sensor for sensing an atmospheric pressure, and a pressure sensor provided in a fuel supply line for detecting a fuel pressure and for generating a pressure signal, an improvement of the method which comprises the steps of: comparing said pressure signal with a predetermined pressure value in accordance with operating conditions of said engine: decreasing said amount of fuel when said pressure signal is higher than said predetermined pressure value; and stopping said engine either by cutting said power to said spark plug or by cutting said fuel when said pressure signal is lower than said predetermined pressure value.

Claim 5

A fuel injection control system for an internal combustion engine, having a crankshaft in a crankcase, a cylinder with a spark plug, a generator provided in said crankcase for generating power to said spark plug, an injector provided in an intake manifold for injecting an amount of fuel into said cylinder, a throttle sensor for detecting an opening degree of a throttle valve and for generating a degree signal, an atmospheric pressure sensor for sensing an atmospheric pressure, and a pressure sensor provided in a fuel supply line for detecting a fuel pressure and for generating a pressure signal, an improvement of the system which comprises: comparator means for comparing said pressure signal with a predetermined pressure value in accordance with operating conditions of said engine and for producing one of pressure decreasing signal and a pressure increasing signal as a result of the comparison; deceasing means responsive to said pressure decreasing signal for decreasing said amount of fuel; and increasing means responsive to said pressure increasing signal for increasing said amount of fuel when said pressure signal is lower than said predetermined pressure value.

Claim 6

A fuel injection control system for an internal combustion engine, having a crankshaft in a crankcase, a cylinder with a spark plug, a generator provided in said crankcase for generating power to said spark plug, an injector provided in an intake manifold for injecting an amount of fuel into said cylinder, a throttle sensor for detecting an opening degree of a throttle valve and for generating a degree signal, an atmospheric pressure sensor for sensing an atmospheric pressure, and a pressure sensor provided in a fuel supply line for detecting a fuel pressure and for generating a pressure signal, an improvement of the system which comprises: comparator means for comparing said pressure signal with a predetermined pressure value in accordance with operating conditions of said engine and for producing one of pressure decreasing signal and a pressure increasing signal as a result of the comparison; deceasing means responsive to said pressure decreasing signal for decreasing said amount of fuel; and increasing means responsive to said pressure increasing signal for increasing said amount of fuel when said pressure signal is lower than said predetermined pressure value.

Claim 7

A fuel injection control system for an internal combustion engine, having a crankshaft in a crankcase, a cylinder with a spark plug, a generator provided in said crankcase for generating power to said spark plug, an injector provided in an intake manifold for injecting an amount of fuel into said cylinder, a throttle sensor for detecting an opening degree of a throttle valve and for generating a degree signal, an atmospheric pressure sensor for sensing an atmospheric pressure, and a pressure sensor provided in a fuel supply line for detecting a fuel pressure and for generating a pressure signal, an improvement of the system which comprises: comparator means for comparing said pressure signal with a predetermined pressure value in accordance with operating conditions of said engine and for producing a stopping signal when said pressure signal is lower than said predetermined pressure value; and stopping means responsive to said stopping signal for stopping said engine either by cutting said power to said spark plug or by cutting said fuel.

Claim 8

A fuel injection control system for an internal combustion engine, having a crankshaft in a crankcase, a cylinder with a spark plug, a generator provided in said crankcase for generating power to said spark plug, an injector provided in an intake manifold for injecting an amount of fuel into said cylinder, a throttle sensor for detecting an opening degree of a throttle valve and for generating a degree signal, an atmospheric pressure sensor for sensing an atmospheric pressure, and a pressure sensor provided in a fuel supply line for detecting a fuel pressure and for generating a pressure signal, an improvement of the system which comprises: comparator means for comparing said pressure signal with a predetermined pressure value in accordance with operating conditions of said engine and for producing a stopping signal when said pressure signal is lower than said predetermined pressure value; and stopping means responsive to said stopping signal for stopping said engine either by cutting said power to said spark plug or by cutting said fuel.