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Octane Number Requirement Survey of 1990 Japanese Passenger Cars

1992; Volume: 35; Issue: 1 Linguagem: Inglês

10.1627/jpi1958.35.98

0582-4664

The Sub-Committee Of Octane Number Requirement Sur,

Energy, Environment, and Transportation Policies

The Sub-Committee of Octane Number Requirement (ONR) of The Japan Petroleum Institute conducted a 1990 ONR Survey to estimate the maximum ONR distributions for 1990 model cars on the road by use of maximum ONR data compiled from 129 test cars. The maximum ONR data were determined by means of the low speed test method using both Primary Reference Fuel (PRF) and a mixed-type unleaded Full Boiling Range Reference Fuel (FBRRF). The results of the 1990 ONR Survey are summarized below, together with pertinent information on test cars, test fuels, test method for ONR measurement and calculation procedure for determining maximum ONR distribution.The maximum ONR of the 129 test cars ranged from 80.0 to 97.0 RON as tabulated Tables 5 and 6. Using those data, maximum ONR distributions were calculated for 1990 model cars on the road.Figure 1 and Table 7 indicate that the maximum ONR distributions for 1990 model cars on the road, determined by PRF, were 88.2 and 92.3 RON at 50% and 90% car satisfaction levels, respectively. These ONR distributions for 1990 model cars were similar to those for 1989 model cars as shown in Fig. 2. The trends of ONR at all satisfaction levels have levelled-off since 1986 year as indicated in Fig. 3.Regarding maximum ONR distributions by engine displacement, smaller engines were prone to show higher maximum ONR as summarized in Table 9. More than 98% of the 129 test cars showed maximum ONR under wide open throttle acceleration conditions as indicated in Fig. 4.Table 11 indicate that maximum ONR distributions for premium requirement cars on the road, determined by PRF, were 95.3 and 99.9 RON at 50% and 90% car satisfaction levels, respectively.ONR data were collected on 129 Japanese passenger test cars (13 models includuing 94 cars equipped with automatic transmission). The test cars and their engine types are shown in Table 1.For the 1990 ONR survey, PRF and FBRRF were used as reference fuels. The ratio of blending stocks for FBRRF and the properties of each blending stock are shown in Tables 2 and 3, respectively.About 80% of maximum ONR data were determined on 9 chassis dynamometers belonging to participant companies and the remaininder were measured on a test track owned by the Japan Automotive Research Institute (JARI).Maximum ONRs were measured in accordance with JPI Standard Method 65-6-84 (the low speed test method) which covers trace knock determination at a range of engine speeds from 1, 000 to 4, 000rpm under acceleration condition in top gear. The acceleration technique is summarized in Table 4.52 of the 129 ONRs are those of 1990 model test cars. The remaining 77 ONRs are of 1989 model test cars, which were still on the market as 1990 model cars without a full model change.Maximum ONR distribution for the 1990 model cars on the road was determined in accordance with JPI Standard Method 6S-7-84 using ONR data of test cars.