Octane Number Requirement Survey of 1978 Japanese Passenger Cars

DOI Web Site Web Site

Bibliographic Information

Other Title
  • １９７８年度国産乗用車のオクタン価要求値調査結果
  • 1978ネンド コクサン ジョウヨウシャ ノ オクタンカ ヨウキュウチ チョウ

Search this article

Abstract

The Sub-Committee of Octane Number Requirements (ONR) of The Japan Petroleum Institute has made a 1978 ONR survey on 120 Japanese passenger cars, including 19 automatic transmission cars, of 15 different models.<br>All the test cars have passed the 1976 or 1978 Japanese automative emissions regulations. Since the 1975 ONR survey, the minimum mileage required to keep the stable ONR has been increased to over 6, 000km.<br>Test vehicles and engine types are shown in Table 1.<br>Primary Reference Fuel (PRF) and two types of unleaded Full Boiling Range Reference Fuel (FBRRF), [A] Reformate Type and [B] Mixed Type, have also been used as reference fuels.<br>The blending proportions for preparing the FBRRFs and properties of the blending stocks are shown in Tables 2 and 3, respectively.<br>Both the low and high speed knock identifications were mainly carried out on the eight chassis dynamometers belonging to the participant companies and partly at the Test Track of the Japan Automobile Research Institute. The road load of simulation of the chassis dynamometers was set arbitrarily by each participant but the inertia weight of the chassis dynamometer was set equal to the total vehicle weight.<br>The determination of knock was performed according to the JPI Standard Method 6R-6-77.<br>The low speed knock was identified in the engine speed range from 1, 000rpm to 4, 000rpm during acceleration at the highest gear position.<br>The high speed knock was evaluated by accelerating the car from 80km/hr. The test results obtained were treated statistically according to the JPI Standard 6R-2-72 in order to calcuate the car satisfaction distribution for each of the given octane number fuels.<br>For these statistical data, ONRs of 108 cars surveyed in 1976 and 1977 were incorporated in the calculations, since these same types of cars were continuously sold in 1978.<br>These results are shown in Table 7 and illustrated in Figs. 1 and 2.<br>The low speed ONRs of 1978 model cars for 50% and 90% market satisfaction with the PRF were 89.2 and 93.4 Octane Numbers, respectively. The high speed ONRs of 1978 model cars for 50% and 90% market satisfaction with the PRF were 86.0 and 89.4 Octane Numbers, respectively.<br>The ONR distributions of all the cars tested are summarized in Tables 5 and 6.

Journal

Keywords

Details 詳細情報について

Report a problem

Back to top