Đang tải... (xem toàn văn)
Tài liệu đào tạo của Caterpila về kiểu động cơ C15 ,C18,C27,C32
ACERTTM Technologyfor Off-Highway C15, C18, C27 and C32 Engines ACERT TechnologyWhat does ACERT stand for? What is ACERT Technology?What engines are affected? How is ACERT Technology Different?What does ACERT Technology look like?How does ACERT Technology work?What are the advantages of ACERT Technology? Is extra maintenance required? ACERT TechnologyWhat does ACERT stand for?AdvancedCombustionEmissionsReductionTechnology What is ACERT Technology?Multiple technologiesVaries by engine familyVaries by engine application–Medium duty – specs, changes, new design–Heavy duty – specs, changes, new design C15, C18 ACERT How are the C15 and C18 Affected?•C15 and C18 ACERT are based off the C-15 platform•C15 displacement changes from 14.6 to 15.2 ltr.•Bore remains 137mm•Stroke increases from 165mm to 171mm•C18 displacement is 18.1 ltr.•Bore increases from 137mm to 145mm•Stroke increases from 171mm to 183mm C15, C18 Power Band Performance2100 rpm providesWidest operating rangeEasiest match in changeover 1800 rpm providesBest fuel economyBest heat rejection Less noise 1300 1500 1700 1900 2100RPMPOWERABCDEFull Power from 1800 to 2100 rpm C15 / C18 Heat Rejection•Changing from 2100 rpm’s to 1800 DECREASES heat rejection in the C15 and maintains same heat rejection in the C18 * kW of heat rejection per kW of engine power—jacket waterEPA Engine Hp RPM JW* % Change Air % ChangeTier 3 C18 630 1800 0.36 0.0% 0.22 10.0%Tier 3 C18 630 2100 0.38 5.6% 0.24 20.0%Tier 2 C-16 630 2100 0.36 0.2Tier 3 C15 540 1800 0.36 -7.7% 0.21 16.7%Tier 3 C15 540 2100 0.38 -2.6% 0.23 27.8%Tier 2 C-15 525 2100 0.39 0.18Air Jacket WaterC15 / C18 ACERT C15 / C18 Fuel EfficiencyEPA Engine Hp RPM BSFC % ChangeTier 3 C18 630 1800 219 4.8%Tier 3 C18 630 2100 228 9.1%Tier 2 C-16 630 2100 209Tier 3 C15 540 1800 217 4.0%Tier 3 C15 540 2100 223 6.9%Tier 2 C-15 525 2100 208.6•Changing from 2100 rpm’s to 1800 fuel economy is maximized in the C18 and C15C15 / C18 ACERT Engine FeaturesC15, C18 ACERT [...]... Supports messages for powertrain integration Interface with Cat Messenger and analog gauges C15, C18 Head bolt torque sequence C15, C18 Head Bolt Torque Procedure •Tighten bolts 1-26 in sequence to 270 +/- 15 Nm •Tighten bolts 1-26 in sequence to 450 +/- 15 Nm •Retighten bolts 1-26 in sequence to 450 +/- 15 Nm C15, C18, C27, C32 Turbocharger • Wastegated turbocharger • Provides higher boost over wide... Wastegate Boost Boost RPM C15, C18 Wastegated Turbo Actuator Hose Wastegate Actuator Water Cooled Center Section Water cooled return to radiator line Water cooled turbo supply line Water cooled turbo supply from water pump C15, C18 Cat Compression Brake Some models equipped with Cat Brake Developed and manufactured by Caterpillar Functionally similar to previous compression brakes C15, C18 Compression Brake... 2 Actuator valve Slave piston Oil Sump Engine supply oil Master piston C15, C18 Cat Brake Oil Feed Path OIL FEED 3/4 in Hex Heads on 1/2 in Threaded Fasteners 5 Places 9/16 in Hex Heads on 3/8 in Threaded Fasteners 2 Places C15, C18 Cat Brake Oil Feed Path Oil Feed Bolt OIL FEED “Studded” Bolt, 4 locations, used w/ Cat Brake only C15, C18 Brake and Nonbrake Rockers Injector Rocker: Cat Brake master... C18 Brake and Nonbrake Rockers Injector Rocker: Cat Brake master piston fits in here Exhaust Rocker: Cat Brake slave piston contacts here Common CAT Brake & Non- Brake C15, C18 Cat Brake Installation 6 4 2 1 3 Tightening Sequence 7 5 C15, C18 Valve Cover Base Installation Tighten to 18 +/- 3 Nm in numerical sequence ... Excellent power density Design Strategy ACERT technology Externally similar to C-15 One installation for wide power range Best in class power density Design Strategy • • • • • Increased compression ratio • C15 - 18:1 compression ratio • C18 – 16.3:1 or 18:1 based on HP rating Component changes to increase peak cylinder pressure capability Improves cold start characteristics Improves white smoke clean up... higher roller contact Primary area of roller markings (similar to Tier II) Tier 2 – one main area of heavy roller contact Tier III – two main areas of contact Secondary roller markings (new with Tier III) C15, C18, C27, C32 Fuel System Mechanical Electronic Unit Injector Proven design Proven high reliability Enhancements Multiple injection Rate shaping ADEM 4 Electronic Engine Control Generations of Experience . specs, changes, new design C15, C18 ACERT How are the C15 and C18 Affected? C15 and C18 ACERT are based off the C-15 platform C15 displacement changes from. 0.2Tier 3 C15 540 1800 0.36 -7.7% 0.21 16.7%Tier 3 C15 540 2100 0.38 -2.6% 0.23 27.8%Tier 2 C-15 525 2100 0.39 0.18Air Jacket WaterC15 / C18 ACERT C15 / C18