Internal-combustion engines – Engine speed regulator – Idle speed control
Patent
1988-03-14
1989-11-14
Wolfe, Willis R.
Internal-combustion engines
Engine speed regulator
Idle speed control
123352, F02D 4116
Patent
active
048799831
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a apparatus for controlling the number of the rotation of an internal combustion engine, which feeds the number of non-loaded rotation of an internal combustion engine back to the predetermined number of the rotation.
PRIOR ART
Conventionally, the number of non-loaded rotation of any internal combustion engine has been controlled in order that it can be fed back to the predetermined number of the rotation. The object of controlling the number of non-loaded rotation of the internal combustion engine is to set the number of non-loaded rotation for minimizing fuel consumption during non-loaded operation and also suppress variation of the number of the rotation caused by external disturbance. In either of these cases, it is essential that control be executed very quickly and precisely.
Roughly speaking, two main factors cause the number of the rotation of any engine to vary, which can be classified into the primary factor caused by variation of the loss of non-load of the engine itself or by variation of thermal efficiency of the engine and the secondary factor caused by either the variation of the adjustment gain present in airsuction adjusting means which adjusts the varied number of the rotation caused by the primary factor or by variation of the atmospheric density substantially making up the supply source of fresh air.
To compensate for those variable factors, as proposed by the Japanese Patent Laid-Open No. 59-162340 (1984), there is a specific technique for controlling the number of the rotation of an internal combustion engine, which first generates the objective air-suction volume or the objective air-suction tube pressure in response to the adjustment signal in accordance with the deviation between the objective value and the actual value of the number of the rotation of the internal combustion engine, followed by control of airsuction adjustment means in response to the adjustment signal in accordance with the deviation between the objective air-suction quantity or the objective air-suction tube pressure and the actual air-suction quantity or the actual airsuction tube pressure.
According to this prior art, since the adjustment signal (the signal which adjusts the number of the rotation of the internal combustion engine) is activated in accordance with the deviation between the objective and actual values of the number of the rotation in conjunction with the primary factor of the variable rotations mentioned above and the other adjustment signal (signal which adjusts air-suction quantity) is also activated in accordance with the objective and actual values of the air-suction quantity or the internal pressure of the air-suction tube in conjunction with the secondary factor of the variable rotations mentioned above, it is obvious clear that the variation of the rotation of the engine can precisely and quickly be adjusted rather than applying feedback control using only the number of the rotation.
Since those primary and secondary factors respectively render considerable influence including substantial variation of characteristic during a certain period of time, those adjustment signals extensively adjust the number of the rotation of the engine and the air-suction quantity as well. This in turn obliges the control system to spend much time before allowing the adjustment signal to adjust the number of the rotation from the initial value to the final value, thus eventually obstructing the initial object from properly controlling the number of the rotation of the engine being operated.
Furthermore, in an extreme case, the engine may not be activated at all due to shortage of fresh air being supplied. If this occurs, improvement of the engine condition can not be expected because the operation of the engine rotation-number control starts.
The primary object of the present invention is to overcome those problems mentioned above by providing a novel apparatus for controlling the number of the rotation of an internal combustion engine, which can con
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patent: 4665871 (1987-05-01), Shimomura et al.
patent: 4667632 (1987-05-01), Shimomura et al.
patent: 4672934 (1987-06-01), Peter et al.
patent: 4691675 (1987-09-01), Iwaki
patent: 4785780 (1988-11-01), Kawai
Nishimura Yukinobu
Shimomura Setsuhiro
Mitsubishi Denki & Kabushiki Kaisha
Wolfe Willis R.
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