Automotive electronic fuel-saving circuit (1)

Circuit Principle This fuel saver uses a cylindrical high-performance internal combustion engine combustion pressure sensor (capacitive pressure sensitive element). The pressure change in the combustion chamber in the cylinder body
is converted into an electrical change, and the electrical change is expressed as a sawtooth pulse synthetic wave. The sawtooth part reflects
the pressure change from the intake to the end of compression, and the pulse wave part reflects the pressure change after ignition. We cut out the top of the sawtooth wave as the ignition control signal , and
use this signal to trigger the thyristor. The thyristor here replaces the ignition switch of the original ignition (i.e. a pair of platinum contacts). Thyristor contactless switches have
the advantages of long life, fast switching speed, and low cost.
    At the end of this pulse compression stroke, the maximum pressure in the combustion chamber occurs (before ignition). The high-voltage pulse after ignition
is absorbed by the trap in the electronic circuit, as shown in the circuit diagram.
    The pressure change in the combustion chamber is measured by the capacitive pressure sensitive element and converted into an electrical
signal. This pressure electrical signal is linearly amplified by VT1 and VT2. VS1 is the limiting
voltage regulator diode, R1 and R2 are the VT1 bias current dividing resistor, RP It is
the VT1 load potentiometer, and also controls the DC operating point of VT2. By changing
the value of RP, the top of the sawtooth wave can be cut out. This signal is amplified by
VT2 and used as a synchronization pulse to trigger the on and off of the thyristor contactless switch.
Rz is the current limiting resistor of VS2, and VS2 is the Zener diode. This plays
a role in increasing and stabilizing the VT2 emitter potential. R4 is the VT2 load:
an electrolytic capacitor with a resistance of 5 ores, which plays a coupling role.