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Summary of change:
'''Certified CNG engine''' 4 cyl 2L PSA engine (Peugeot, Citroen, Suzuki, Fiat) * turbo: exact type ? ... non variable geometry * compression: 13.5 (max 10 or 10.5, 13.5 will be a problem) ---- '''Certification''' There are some certification considerations: '''R110''' (114 pages, my doc is in Hungarian; seems like it is derived from some UN directive) for CNG engine road vehicles... * available in English ? * Only very small part is for ECU ** p104 4H (after collision, if trigger stops, valve must stop within 5 sec) ** and p113 5O section (ECU-in-cabin operation temperature: -40..+85C) ** these sound easy to maintain with VEMS Is EMI test needed? Most likely series resistors will be used, not PWM-ing (with PWM-ing, special harness would be needed to pass certification EMI test, if EMI test needed at all). The Certification harness might slightly differ from the production harness. Eg. * contains signal generator for primary trigger * might be slightly shorter Why certify ? Third-party certification is good for certification :-) ---- '''Trigger''' * '''primary trigger: VR''' (measured 890 Ohm) ** pattern 60-2 most likely * secondary trigger: VR ** measured 1500 Ohm ** it's not a problem, but suspicious... why is it VR ? (HALL is more usual for camshaft) What engine was the cylinder head derived from ? ---- '''Low Impedance Injectors''' [http://enerma.pl/en/injectros/3898-injector-hercules-gism-i1000-bf.html Hercules GISM-I1000] '''3.5 Ohm .. 3.8 Ohm measured, some sites say 1.7 Ohm''' * as a verification: 2 injectors in series is 7..7.2 Ohm (so we can say 3.5 Ohm is probably correct) * Opening time - 2.5 ms * Operating temperature - 20 ° C (or -40C) to +120 ° C * no PWM-ing (especially for certification harness) 3.3 or 4.7 Ohm 50 Watt series resistor for each ? (6.8 Ohm might be too high to open reliably). ---- '''Pressure sensors''' '''MAP sensor''' on "air-side" * BOSCH 10-07-133-FL1 816 0261230042 ** is this in manifold ? * CNG pressure senzor: '''BOSCH 0 261 230 145''' ** 0-5V analog signal ? ** What is the CNG pressure regulated or pressure compensation needed ? ** What is CNG pressure ? (or what is the pressure range ?) ---- '''Harness for certification''' * 1 or 4 injectors ? * signal generator * can TUV apply 13.5V (12..14V) DC supply ** or should we include a 230V => 12V supply with the test setup ? ---- '''Ignition''' * 4 COP ** active or passive ? ** resistance measured ? ---- '''Exhaust measurement''' These are easy: * CO * CxHx * O2 * NOx * CH4
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