Operation control system for internal combustion engines at and after starting

Claim 1

In a system for controlling the operation of an internal combustion engine having an intake passage, including temperature sensor means for sensing a temperature of said engine, control valve means for controlling an amount of intake air supplied into said intake passage of said engine, valve opening determining means responsive to an output from said temperature sensor means for determining the opening of said control valve means at the start of said engine, and valve actuator means responsive to an output from said valve opening determining means for controlling said control valve means, the improvement including starting period detecting means for detecting whether or not a starting state of said engine has lasted over a predetermined period of time and intake air amount correcting means for correcting the amount of intake air to a larger value after said predetermined period of time has elapsed, said predetermined period of time being set to a shorter value as the temperature of said engine is lower, wherein said valve opening determining means sets the opening of said control valve at the start of said engine to a value such that the amount of intake air is smaller as the temperature of said engine sensed by said temperature sensor means is lower.

Claim 3

A system for controlling the operation of an internal combustion engine having an intake passage, including temperature sensor means for sensing a temperature of said engine, control valve means for controlling an amount of intake air supplied into said intake passage of said engine, valve opening determining means responsive to an output from said temperature sensor means for determining the opening of said control valve means at the start of said engine, said valve opening determining means setting the opening of said control valve at the start of said engine to a value such that the amount of intake air is smaller as the temperature of said engine sensed by said temperature sensor means is lower, valve actuator means responsive to an output from said valve opening determining means for controlling said control valve means, a throttle valve arranged in said intake passage, the system including fuel amount determining means responsive to the output from said temperature sensor means for determining an amount of fuel to be supplied to said engine at the start of same, fuel supply means for supplying said engine with the amount of fuel determined by said fuel amount determining means, second valve opening sensor means for sensing the opening of said throttle valve, correction value determining means responsive to an output from said second valve opening sensor means for determining a correction value for the amount of fuel, said correction value determining means determining said correction value so as to increase the amount of fuel at a larger rate as the opening of said throttle valve is larger, correcting means for correcting the amount of fuel based on the determined correction value, starting period detecting means for detecting whether or not a starting state of said engine has lasted over a predetermined period of time, and intake air amount correcting means for correcting the amount of intake air to a larger value after said predetermined period of time has elapsed, said predetermined period of time being set to a shorter value as the temperature of said engine is lower.

Claim 4

A system for controlling the operation of an internal combustion engine having an intake passage, including temperature sensor means for sensing a temperature of said engine, control valve means for controlling an amount of intake air supplied into said intake passage of said engine, valve opening determining means responsive to an output from said temperature sensor means for determining the opening of said control valve means at the start of said engine, said valve opening determining means setting the opening of said control valve at the start of said engine to a value such that the amount of intake air is smaller as the temperature of said engine sensed by said temperature sensor means is lower, valve actuator means responsive to an output from said valve opening determining means for controlling said control valve means, a throttle valve arranged in said intake passage, the system including fuel amount determining means responsive to the output from said temperature sensor means for determining an amount of fuel to be supplied to said engine at the start of same, fuel supply means for supplying said engine with the amount of fuel determined by said fuel amount determining means, second valve opening sensor means for sensing the opening of said throttle valve, correction value determining means responsive to an output from said second valve opening sensor means for determining a correction value for the amount of fuel, said correction value determining means determining said correction value so as to increase the amount of fuel at a larger rate as the opening of said throttle valve is larger, correcting means for correcting the amount of fuel based on the determined correction value, starting period detecting means for detecting whether or not a starting state of said engine has lasted over a predetermined period of time, and intake air amount correcting means for correcting the amount of intake air to a larger value after said predetermined period of time has elapsed, said predetermined period of time being set to a shorter value as the temperature of said engine is lower.

Claim 7

A system for controlling the operation of an internal combustion engine having an intake passage, including temperature sensor means for sensing a temperature of said engine, control valve means for controlling an amount of intake air supplied into said intake passage of said engine, valve opening determining means responsive to an output from said temperature sensor means for determining the opening of said control valve means at the start of said engine, said valve opening determining means setting the opening of said control valve at the start of said engine to a value such that the amount of intake air is smaller as the temperature of said engine sensed by said temperature sensor means is lower, valve actuator means responsive to an output from said valve opening determining means for controlling said control valve means, a throttle valve arranged in said intake passage, the system including fuel amount determining means responsive to the output form said temperature sensor means for determining an amount of fuel to be supplied to said engine at the start of same, fuel supply means for supplying said engine with the amount of fuel determined by said fuel amount determining means, second valve opening sensor means for sensing the opening of said throttle valve, correction value determining means responsive to an output from said second valve opening sensor means for determining a correction value for the amount of fuel, said correction value determining means determining said correction value so as to increase the amount of fuel at a larger rate as the opening of said throttle valve is larger, and correcting means for correcting the amount of fuel based on the determined correction value, third valve opening determining means responsive to the output from said temperature sensor means for determining the opening of said control valve after the start of said engine, upper limit value setting means responsive to the output from said temperature sensor means for setting an upper limit value of the opening of said control valve after the start of said engine, and valve opening progressive increase means for progressively increasing the opening of said control valve determined by said third valve opening determining means to the set upper limit value.

Claim 8

A system for controlling the operation of an internal combustion engine having an intake passage, including temperature sensor means for sensing a temperature of said engine, control valve means for controlling an amount of intake air supplied into said intake passage of said engine, valve opening determining means responsive to an output from said temperature sensor means for determining the opening of said control valve means at the start of said engine, said valve opening determining means setting the opening of said control valve at the start of said engine to a value such that the amount of intake air is smaller as the temperature of said engine sensed by said temperature sensor means is lower, valve actuator means responsive to an output from said valve opening determining means for controlling said control valve means, a throttle valve arranged in said intake passage, the system including fuel amount determining means responsive to the output form said temperature sensor means for determining an amount of fuel to be supplied to said engine at the start of same, fuel supply means for supplying said engine with the amount of fuel determined by said fuel amount determining means, second valve opening sensor means for sensing the opening of said throttle valve, correction value determining means responsive to an output from said second valve opening sensor means for determining a correction value for the amount of fuel, said correction value determining means determining said correction value so as to increase the amount of fuel at a larger rate as the opening of said throttle valve is larger, and correcting means for correcting the amount of fuel based on the determined correction value, third valve opening determining means responsive to the output from said temperature sensor means for determining the opening of said control valve after the start of said engine, upper limit value setting means responsive to the output from said temperature sensor means for setting an upper limit value of the opening of said control valve after the start of said engine, and valve opening progressive increase means for progressively increasing the opening of said control valve determined by said third valve opening determining means to the set upper limit value.

Claim 14

A system for controlling the operation of an internal combustion engine having an intake passage, including temperature sensor means for sensing a temperature of said engine, control valve means for controlling an amount of intake air supplied into said intake passage of said engine, valve opening determining means responsive to an output from said temperature sensor means for determining the opening of said control valve means at the start of said engine, said value opening determining means setting the opening of said control valve at the start of said engine to a value such that the amount of intake air is smaller as the temperature of said engine sensed by said temperature sensor means is lower, valve actuator means responsible to an output from said valve opening determining means for controlling said control valve means, a throttle valve arranged in said intake passage, the system including fuel amount determining means responsive to the output from said temperature sensor means for determining an amount of fuel to be supplied to said engine at the start of same, fuel supply means for supplying said engine with the amount of fuel determined by said fuel amount determining means, second valve opening sensor means for sensing the opening of said throttle valve, correction value determining means responsive to an output from said second valve opening sensor means for determining a correction value for the amount of fuel, said correction value determining means determining said correction value so as to increase the amount of fuel at a larger rate as the opening of said throttle valve is larger, correcting means for correcting the amount of fuel based on the determined correction value, engine rotational speed setting means responsive to the output from said temperature sensor means for setting a predetermined value of the rotational speed of said engine, third valve opening determining means responsive to the output from said temperature sensor means for determining the opening of said control valve after the start of said engine, and valve opening progressive decrease means for progressively decreasing the opening of said control valve after the rotational speed of said engine reaches said predetermined value.

Claim 15

A system for controlling the operation of an internal combustion engine having an intake passage, including temperature sensor means for sensing a temperature of said engine, control valve means for controlling an amount of intake air supplied into said intake passage of said engine, valve opening determining means responsive to an output from said temperature sensor means for determining the opening of said control valve means at the start of said engine, said value opening determining means setting the opening of said control valve at the start of said engine to a value such that the amount of intake air is smaller as the temperature of said engine sensed by said temperature sensor means is lower, valve actuator means responsible to an output from said valve opening determining means for controlling said control valve means, a throttle valve arranged in said intake passage, the system including fuel amount determining means responsive to the output from said temperature sensor means for determining an amount of fuel to be supplied to said engine at the start of same, fuel supply means for supplying said engine with the amount of fuel determined by said fuel amount determining means, second valve opening sensor means for sensing the opening of said throttle valve, correction value determining means responsive to an output from said second valve opening sensor means for determining a correction value for the amount of fuel, said correction value determining means determining said correction value so as to increase the amount of fuel at a larger rate as the opening of said throttle valve is larger, correcting means for correcting the amount of fuel based on the determined correction value, engine rotational speed setting means responsive to the output from said temperature sensor means for setting a predetermined value of the rotational speed of said engine, third valve opening determining means responsive to the output from said temperature sensor means for determining the opening of said control valve after the start of said engine, and valve opening progressive decrease means for progressively decreasing the opening of said control valve after the rotational speed of said engine reaches said predetermined value.

Claim 21

A system for controlling the operation of an internal combustion engine having an intake passage, comprising: temperature sensor means for sensing a temperature of said engine, control valve means for controlling an amount of intake air supplied into said intake passage of said engine, valve opening determining means responsive to an output from said temperature sensor means for determining the opening of said control valve means at the start of said engine, said valve opening determining means setting the opening of said control valve at the start of said engine to a value such that the amount of intake air is smaller as the temperature of said engine sensed by said temperature sensor means is lower, valve actuator means responsive to an output from said valve opening determining means for controlling said control valve means, a throttle valve arranged in said intake passage, fuel amount determining means responsive to the output from said temperature sensor means for determining an amount of fuel to be supplied to said engine at the start of same, fuel supply means for supplying said engine with the amount of fuel determined by said fuel amount determining means, second valve opening sensor means for sensing the opening of said throttle valve, correction value determining means responsive to an output from said second valve opening sensor means for determining a correction value for the amount of fuel, said correction value determining means determining said correction value so as to increase the amount of fuel at a larger rate as the opening of said throttle valve is larger, correcting means for correcting the amount of fuel based on the determined correction value, engine rotational speed setting means responsive to the output from said temperature sensor means for setting a predetermined value of the rotational speed of said engine, third valve opening determining means responsive to the output from said temperature sensor means for determining the opening of said control valve after the start of said engine, valve opening progressive increase means for progressively increasing the opening of said control valve determined by said third valve opening determining means, and progressive increase stop means for stopping the progressive increase of the opening of said control valve effected by said valve opening progressive increase means when the rotational speed of said engine reaches said predetermined value.

Claim 22

A system for controlling the operation of an internal combustion engine having an intake passage, comprising: temperature sensor means for sensing a temperature of said engine, control valve means for controlling an amount of intake air supplied into said intake passage of said engine, valve opening determining means responsive to an output from said temperature sensor means for determining the opening of said control valve means at the start of said engine, said valve opening determining means setting the opening of said control valve at the start of said engine to a value such that the amount of intake air is smaller as the temperature of said engine sensed by said temperature sensor means is lower, valve actuator means responsive to an output from said valve opening determining means for controlling said control valve means, a throttle valve arranged in said intake passage, fuel amount determining means responsive to the output from said temperature sensor means for determining an amount of fuel to be supplied to said engine at the start of same, fuel supply means for supplying said engine with the amount of fuel determined by said fuel amount determining means, second valve opening sensor means for sensing the opening of said throttle valve, correction value determining means responsive to an output from said second valve opening sensor means for determining a correction value for the amount of fuel, said correction value determining means determining said correction value so as to increase the amount of fuel at a larger rate as the opening of said throttle valve is larger, correcting means for correcting the amount of fuel based on the determined correction value, engine rotational speed setting means responsive to the output from said temperature sensor means for setting a predetermined value of the rotational speed of said engine, third valve opening determining means responsive to the output from said temperature sensor means for determining the opening of said control valve after the start of said engine, valve opening progressive increase means for progressively increasing the opening of said control valve determined by said third valve opening determining means, and progressive increase stop means for stopping the progressive increase of the opening of said control valve effected by said valve opening progressive increase means when the rotational speed of said engine reaches said predetermined value.

Claim 30

A system for controlling the operation of an internal combustion engine having an intake passage, comprising: temperature sensor means for sensing a temperature of said engine, control valve means for controlling an amount of intake air supplied into said intake passage of said engine, valve opening determining means responsive to an output from said temperature sensor means for determining the opening of said control valve means at the start of said engine, said valve opening determining means setting the opening of said control valve at the start of said engine to a value such that the amount of intake air is smaller as the temperature of said engine sensed by said temperature sensor means is lower, valve actuator means responsive to an output from said valve opening determining means for controlling said control valve means, a throttle valve arranged in said intake passage, fuel amount determining means responsive to the output from said temperature sensor means for determining an amount of fuel to be supplied to said engine at the start of same, fuel supply means for supplying said engine with the amount of fuel determined by said fuel amount determining means, second valve opening sensor means for sensing the opening of said throttle valve, correction value determining means responsive to an output from said second valve opening sensor means for determining a correction value for the amount of fuel, said correction value determining means determining said correction value so as to increase the amount of fuel at a larger rate as the opening of said throttle valve is larger, correcting means for correcting the amount of fuel based on the determined correction value, third valve opening determining means responsive to the output from said temperature sensor means for determining the opening of said control valve after the start of said engine, upper limit value setting means responsive to the output from said temperature sensor means for setting an upper limit value of the opening of said control valve after the start of said engine, engine rotational speed setting means responsive to the output from said temperature sensor means for setting a predetermined value of the engine rotational speed, valve opening progressive increase means for progressively increasing the valve opening determined by said third valve opening determining means at a rate depending upon the temperature of said engine until the opening of said control valve reaches said upper limit value set by said upper limit value setting means, and valve opening progressive decrease means for progressively decreasing the opening of said control valve after the engine rotational speed reaches said predetermined value.

Claim 31

A system for controlling the operation of an internal combustion engine having an intake passage, comprising: temperature sensor means for sensing a temperature of said engine, control valve means for controlling an amount of intake air supplied into said intake passage of said engine, valve opening determining means responsive to an output from said temperature sensor means for determining the opening of said control valve means at the start of said engine, said valve opening determining means setting the opening of said control valve at the start of said engine to a value such that the amount of intake air is smaller as the temperature of said engine sensed by said temperature sensor means is lower, valve actuator means responsive to an output from said valve opening determining means for controlling said control valve means, a throttle valve arranged in said intake passage, fuel amount determining means responsive to the output from said temperature sensor means for determining an amount of fuel to be supplied to said engine at the start of same, fuel supply means for supplying said engine with the amount of fuel determined by said fuel amount determining means, second valve opening sensor means for sensing the opening of said throttle valve, correction value determining means responsive to an output from said second valve opening sensor means for determining a correction value for the amount of fuel, said correction value determining means determining said correction value so as to increase the amount of fuel at a larger rate as the opening of said throttle valve is larger, correcting means for correcting the amount of fuel based on the determined correction value, third valve opening determining means responsive to the output from said temperature sensor means for determining the opening of said control valve after the start of said engine, upper limit value setting means responsive to the output from said temperature sensor means for setting an upper limit value of the opening of said control valve after the start of said engine, engine rotational speed setting means responsive to the output from said temperature sensor means for setting a predetermined value of the engine rotational speed, valve opening progressive increase means for progressively increasing the valve opening determined by said third valve opening determining means at a rate depending upon the temperature of said engine until the opening of said control valve reaches said upper limit value set by said upper limit value setting means, and valve opening progressive decrease means for progressively decreasing the opening of said control valve after the engine rotational speed reaches said predetermined value.