Frequency modulated single point fuel injection circuit with dut

Details Frequency modulated single point fuel injection circuit with dut Frequency modulated single point fuel injection circuit with dut

1976-10-04

1978-05-30

Myhre, Charles J.

Internal-combustion engines

Noncompression

123 32ED, 123 32EG, F02B 300

Patent

active

040917738

ABSTRACT:
A frequency modulated control circuit for an electronic fuel injection system to control the pulse-type injection of fuel at a single point of the fuel intake of an internal combustion engine in accordance with the derived mass air flow rate into the engine comprising a pressure sensor for sensing the manifold pressure of the internal combustion engine, and an engine speed sensor, both of which generate an analog signal which are multiplied by a multiplier circuit to provide a signal representative of the mass air flow to the engine. The multiplier circuit includes a separate control input for varying the output signal level of the multiplier circuit by a preselected factor determined by the final output of the control circuit. The output of the multiplier circuit is fed to a voltage controlled oscillator to produce an output signal taking the form of a pulse train, the frequency of which varies with the amplitude of the mass air flow signal. The output of the voltage controlled oscillator is fed to a pulse generator which generates a fixed on-time pulse for each pulse in the pulse train being fed from the voltage controlled oscillator. The output of the pulse generator is sensed by a duty cycle switch which senses when the output frequency of the voltage controlled oscillator results in a high duty cycle for the output pulses. In this high duty cycle situation, the output analog signal of the multiplier is reduced by a preselected fraction. The duty cycle switch also generates an output signal which varies the duration of the pulse output from the pulse generator as a reciprocal of the variation being applied to the multiplier from the duty cycle switch or enable a secondary injector.
The system also includes a temperature sensor and coolant temperature circuit which generates an analog voltage signal which varies as a function of the engine coolant temperature. The temperature analog signal, designated V.sub.H.sbsb.2.sub.O, is fed to a cold start circuit to control the output pulse width fromn the cold start circuit.

REFERENCES:
patent: 3240191 (1966-03-01), Wallis
patent: 3659571 (1972-05-01), Lang
patent: 3683871 (1972-08-01), Barr et al.
patent: 3699931 (1972-10-01), Cinquegrani
patent: 3786788 (1974-01-01), Suda et al.
patent: 3960120 (1976-06-01), Aono et al.
patent: 3982503 (1976-09-01), Keraneu
patent: 4010717 (1977-03-01), Taplin

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