| 摘要 |
In a closed loop electronic fuel injection control unit having a basic fuel schedule in response to engine operating conditions, the amount of oxygen in the exhaust gases is detected and compared with a desired value to provide an error signal. The error signal is shaped to form a series of binary pulses of alternating voltages of constant amplitude in correspondence with the plus and minus deviation from the reference voltage which represents the desired oxygen quantity. The binary pulses are amplified by a variable gain amplifier to provide a signal which is used to adjust the basic fuel schedule. The time duration of each binary pulse is measured by a counter to provide an output when a pulse width reaches a predetermined interval. The counter output is coupled to the amplifier to increase the amplifier gain to change the rate of fuel supply.
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