Apparatus for measuring parameters of work diagram of piston machines

Apparatus for measuring parameters of work diagram of piston machines, said apparatus comprising

• an angular mark sensor having uniformly distributed crankshaft rotation angle marks for one of the piston machines, a top dead center mark, a first output and a second output, the crankshaft rotation angle marks being used for determining top dead center signals and bottom dead center signals;
• a crankshaft angular position pulse former having an input electrically connected to the first output of said angular mark sensor and an output;
• a top dead center pulse former having an input electrically connected to the second output of said angular mark sensor and an output;
• a current crankshaft rotation angle counter having a first input electrically connected to the output of said crankshaft angular position former, a second input electrically connected to the output of said top dead center pulse former and an output;
• a reversible counter having a first input electrically connected to the output of said crankshaft angular position pulse former, a second input and an output;
• a bottom dead center signal decoder for decoding bottom dead center signals, said bottom dead center signal decoder having an input electrically connected to the output of said reversible counter and an output;
• a cycle length counter having an input electrically connected to the output of said bottom dead center signal decoder and an output;
• a main flip-flop having a first input electrically connected to the output of said cycle length counter, a second input electrically connected to the output of said bottom dead center signal decoder and an output;
• a top dead center signal decoder for decoding top dead center signals, said top dead center signal decoder having an input electrically connected to the output of said current crankshaft rotation angle counter and n outputs;
• a selector switch having a first group of inputs among n inputs, a second group of inputs among n inputs, a first output and a second output, one of the inputs of the first group of inputs being coupled to a corresponding one of the n outputs of said top dead center signal decoder;
• n pressure sensors in cylinders of piston machines, each having an output coupled to a corresponding one of the n inputs of the second group of inputs of said selector switch;
• an amplifier converter for handling a pressure signal of the cylinder of a piston machine, said amplifier converter having an input electrically connected to the second output of said selector switch and an output;
• a pulse width converter having a first input electrically connected to the output of said amplifier converter, a second input and an output;
• an AND gate having a first input electrically connected to the output of said crankshaft angular position pulse former, a second input, and an output electrically connected to the second input of said pulse width converter;
• a main coincidence gate having a first input electrically connected to the output of said pulse width converter, a second input and an output;
• a reference oscillator having an output electrically connected to the second input of said main coincidence gate;
• and
• an analysis and control unit having a first input electrically connected to the output of said main coincidence gate, a second input electrically connected to the first output of said selector switch, a third input electrically connected to the output of said reversible counter, a fourth input electrically connected to the output of said bottom dead center signal decoder, and an output electrically connected to the second input of said reversible counter, said analysis and control unit including a logical circuit having a first input which is the third input of said analysis and control unit, a counter having an input which is the first input of said analysis and control unit and a flip-flop having a first input which is the second input of said analysis and control unit, a second input which is the fourth input of said analysis and control unit, and an output which is the output of said analysis and control unit.