1、_SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising theref
2、rom, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2010 SAE International All rights reserved. No part of this publication ma
3、y be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-4970 (outside US
4、A) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/J1612_201010SURFACEVEHICLERECOMMENDEDPRACTICEJ1612 OCT2010 Issued 2010-10 Cab Heating Systems T
5、est Procedure and Performance Requirements Trucks, and Multipurpose Vehicles RATIONALENot applicable. 1. SCOPE This SAE Recommended Practice establishes uniform test procedures and performance requirements for engine coolant type heating systems of enclosed truck cabs. The intent is to provide a tes
6、t that will ensure acceptable comfort for cab occupants. It is limited to a test that can be conducted on uniform test equipment in commercially available laboratory facilities.There are two options for producing hot coolant in this document. Testing using these two approaches on the same vehicle wi
7、ll not necessarily provide identical results. Many vehicle models are offered with optional engines, and each engine has varying coolant temperatures and flow rates. If the test is being conducted to compare the performance of one heater design to another heater design, then the external coolant sou
8、rce approach (Test A) will yield the most comparable results. If the test is being conducted to validate the heater installation on a specific vehicle model with a specific engine, then using the engine to heat the coolant (Test B) will be more appropriate.This document will be reviewed and revised
9、as required with advancements in technology and changes in environmental laws.2. REFERENCES 2.1 Related Publications The following publications are provided for information purposes and are not a required part of this document. 2.1.1 SAE Publications Available from SAE International, 400 Commonwealt
10、h Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org.SAE J1163 Determining Seat Index Point SAE J1612 Issued OCT2010 Page 2 of 73. DEFINITIONS 3.1 Coolant Liquid used for heat transfer composed of 50% ethylene glycol/50% water or ot
11、her liquids specified by vehicle manufacturer for use in the heat transfer system. 3.2 Heating-Defrosting System The system used to heat the cab interior and to clear the windshield including all ducting, fans, and heat exchanger equipment.3.3 Truck Cab Front occupant space for a driver and one or t
12、wo passengers. 3.4 Sleeper Cab Occupant space behind the Truck Cab intended to be used as living space either during travel or while the vehicle is parked.3.5 Crew Cab Occupant space behind a Truck Cab intended to carry additional passengers and/or to be used as a warming area for personnel during e
13、xtended stationary operation. 3.6 Seat Index Point (SIP) This point describes the theoretical hip pivot point of a seated human. Alternately referred to as the “H-Point”, “Seat Reference Point” (SRP), and “Seating Reference Point” (SgRP). 3.7 Average Cab Temperature Average of all temperature probe
14、values applicable to the test vehicle configuration 4. HEATING TEST 4.1 Performance Criteria The Heating and Defrosting System shall have sufficient capacity to raise the average cab temperature:From: -18 C (0 F) To: +20 C (68 F) Within: 30 minutes. The Heating and Defrosting System shall have suffi
15、cient air distribution to ensure that all temperature probes reach at least +15.6 C (60 F) within 30 minutes. At the end of the test, the temperature at each occupant head shall not exceed the temperature at the feet.The heater and the defroster may be used in any combination that provides optimum h
16、eating performance. SAE J1612 Issued OCT2010 Page 3 of 74.2 Test Equipment 4.2.1 Vehicle Environmental Chamber (VEC) Environmental chamber sufficiently large to contain the basic vehicle with provision for circulating air. The chamber must be capable of maintaining the specified temperature conditio
17、ns for the duration of the test. 4.2.2 Engine Speed Engine tachometer with an accuracy of 2% of observed values. 4.2.3 Time Stopwatch or other timing device. 4.2.4 Temperature Thermometers, thermocouples, or other temperature measuring devices with an accuracy of 0.5 C (1 F). 4.2.5 Air Velocity Anem
18、ometer to measure air velocity (with a measuring accuracy of 2% of observed values). 4.3 Test Conditions The engine in the test vehicle will be used to provide coolant flow to the heater and defroster system under test. All engine, heater, and defroster units shall be standard production parts or eq
19、uivalent, adjusted to the manufacturers specified limits. 4.3.1 Coolant Source TEST A: Independent coolant supply.TEST B: Engine running at 1500 rpm 50 rpm in neutral gear or the high idle RPM set by the vehicle OEM, whichever is higher. An auxiliary means for preheating the engine is permissible to
20、 provide easier engine starting. Engine speed shall be maintained with no load (normal engine parasitic loads only) throughout the test. 4.3.2 Heater Defroster System Coolant Flow TEST A: 11.4 kg/min 2.3 kg/min (25 lb/min 5 lb/min) TEST B: With engineThat flow resulting from engine operation as pres
21、cribed in 4.3.1. 4.3.3 Heater Defroster System Coolant Temperatures TEST A: To be maintained at 65 C + 3 C/0 C (150 F + 5 F/0 F) for the entire test period TEST B: To be at 65 C 3 C (150 F 5 F) at the start of the test, or the maximum temperature that the engine can produce at the test conditions if
22、 it cannot reach this value. Coolant temperature after the start of the test is to be a function of the engine temperature control characteristics at the test conditions.4.3.4 VEC Temperature Average Chamber Temperature: 18 C 2 C (0 F 4 F). 4.3.5 VEC Air Velocity The maximum wind velocity shall not
23、exceed 8 km/h (5 mph). SAE J1612 Issued OCT2010 Page 4 of 74.3.6 Heating and Defrosting System Controls Set Heater and Defroster controls to maximum temperature and maximum fan settings, or the best combination to provide optimum heating performance. 4.3.7 Cab Engine hood, doors, windows, and contro
24、llable fresh air vents shall be closed. Operation of the side windows is not permitted during the test. The bunk curtain shall be open throughout the test. Window coverings shall not be used. NOTE: The intent is that the cab be in a condition that represents actual in-service use. 4.3.8 Auxiliary He
25、ater If an auxiliary heater (or heaters) is part of the standard heater and defroster system, it may be operated. 5. TEST INSTRUMENTATION 5.1 Coolant Temperature The temperature of the engine coolant shall be measured as near to the inlet and outlets of the heater core as possible, but not farther t
26、han 152 mm (6 in) from the heater inlet and outlet tubes. For those systems using more than one heater, it shall be measured at the inlet of the heater unit getting the first coolant flow, and the outlet of the heater unit getting thelast coolant flow. 5.2 Air Temperature Probe Locations Thermocoupl
27、es for measuring cab interior temperatures will be used to determine heating system performance. Additional temperature measurements may be recorded at the discretion of the testing party to achieve further information related to the vehicle heating system. Recommended measurements include air tempe
28、rature into the heater (fresh air and re-circulated air measured separately) and air temperature out of the main heater unit. 5.2.1 Truck Cab Locate temperature probes at the driver and passenger positions relative to each Seat Index Point (SIP) per Figure 1. 5.2.2 Crew Cab Locate temperature probes
29、 at the driver and passenger side crew seats relative to each Seat Index Point (SIP) per Figure 1. SAE J1612 Issued OCT2010 Page 5 of 7FIGURE 1 - TEMPERATURE PROBE LOCATIONS FOR SEATS 5.2.3 Sleeper Cab Locate temperature probes in the Sleeper Cab per Figure 2 and Table 1. TABLE 1 - TEMPERATURE PROBE
30、 LOCATIONS FOR SLEEPER BUNK Probe ID Description Horizontal Location Vertical LocationT1 Sleeper Bunk, Passenger Side Top 600 mm from side wall and rear wall 600 mm below ceilingT3 Middle 600 mm from side wall and rear wall 150 mm above mattressT5 Floor 300 mm ahead of bunk, equally spaced between c
31、ab wall and T6 300 mm above floorT2 Sleeper Bunk, Driver Side Top 600 mm from side wall and rear wall 600 mm below ceilingT4 Middle 600 mm from side wall and rear wall 150 mm above mattressT6 Floor 300 mm ahead of bunk, equally spaced between cab wall and T5 300 mm above floorSAE J1612 Issued OCT201
32、0 Page 6 of 7FIGURE 2 - TEMPERATURE PROBE LOCATIONS FOR SLEEPER BUNK 6. TEST PROCEDURE 6.1 Vehicle Soak Period The vehicle shall stand inoperative at the specified test temperature to soak for a period of not less than 10 hours. Vehicle hood, doors, and windows should be open during soak time. NOTE:
33、 If instrumentation is available to assure that on average the cab and HVAC system with ductwork are stabilized at the test temperature, a shorter soak time may be used. 6.2 Test Period The test period begins when the engine starts. Test conditions are to be maintained throughout the duration of the
34、 test. As the test proceeds, the Vehicle Environmental Chamber temperature shall not vary from 18 C 3 C. 6.3 Reporting Record temperatures of all test probes every 5 minutes. Provide specification sheet of test truck. SAE J1612 Issued OCT2010 Page 7 of 7Provide list of non-standard options on the te
35、st truck. Calculate Interior Temperature by averaging all temperature probe values. Probe ID Description 5 10 15 20 25 30 35 40VEC VEC ChamberH1 Heater Coolant InletH2 Heater Coolant OutletD1 FootD2 HandD3 HeadP1 FootP2 HandP3 HeadCD1 FootCD2 HandCD3 HeadCP1 FootCP2 HandCP3 HeadT2 TopT4 MiddleT6 Flo
36、orT1 TopT3 MiddleT5 FloorAverageCrew SeatForward FacingPassenger SideCrew SeatForward FacingDriver SideTime (Minutes)Sleeper BunkPassenger SideSleeper BunkDriver SideDriver SeatPassenger SeatFrontFIGURE 3 - HEATER TEST DATA SHEET 7. NOTES 7.1 Marginal Indicia A change bar (I) located in the left mar
37、gin is for the convenience of the user in locating areas where technical revisions, not editorial changes, have been made to the previous issue of this document. An (R) symbol to the left of the document title indicates a complete revision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only. PREPARED BY THE SAE TRUCK AND BUS WINDSHIELD WIPERS AND CLIMATE CONTROL COMMITTEE OF THE SAE TRUCK AND BUS BODY AND OCCUPANT ENVIRONMENT ADVISORY GROUP
