How steep a grade can be climbed by the automobile in Sample Problem 1.3 with a rear axle gear ratio of 1.76 and a transmission gear ratio of 1.95 while maintaining a constant speed of 60 mph? (Note: With the given transmission gear ratio of 1.95 the car is not in high gear... it is in a "lower gear" (i.e. The car has been "down shifted" to accommodate the hill.)) 60 mph The information given below is a reproduction of Sample Problem 1.3 along with the relevant graphs. Ans. 16.14% Grade SAMPLE PROBLEM 1.3 Automotive Performance Analysis Figure 1.7 shows a representative engine power requirement curve for constant speed, level road operation of a 4000-lb automobile. Figure 1.8 shows the wide-open-throttle horsepower curve of its 350-in. V-8- engine. The extreme right-hand point of each curve represents wide-open-throttle operation. The rolling radius of the wheels varies a little with speed, but can be taken as 13 in. The transmission provides direct drive in high gear. FIGURE 1.7 Vehicle power requirement. Typical 4000-lb sedan (level road, constant speed, no wind). Vehicle road load power (hp) 160 120 80 40 0 20 40 60 Vehicle speed (mph) 80 100 120

How steep a grade can be climbed by the automobile in Sample Problem 1.3 with a rear axle gear ratio of 1.76 and a transmission gear ratio of 1.95 while maintaining a constant speed of 60 mph? (Note: With the given transmission gear ratio of 1.95 the car is not in high gear... it is in a "lower gear" (i.e. The car has been "down shifted" to accommodate the hill.)) 60 mph The information given below is a reproduction of Sample Problem 1.3 along with the relevant graphs. Ans. 16.14% Grade SAMPLE PROBLEM 1.3 Automotive Performance Analysis Figure 1.7 shows a representative engine power requirement curve for constant speed, level road operation of a 4000-lb automobile. Figure 1.8 shows the wide-open-throttle horsepower curve of its 350-in. V-8- engine. The extreme right-hand point of each curve represents wide-open-throttle operation. The rolling radius of the wheels varies a little with speed, but can be taken as 13 in. The transmission provides direct drive in high gear. FIGURE 1.7 Vehicle power requirement. Typical 4000-lb sedan (level road, constant speed, no wind). Vehicle road load power (hp) 160 120 80 40 0 20 40 60 Vehicle speed (mph) 80 100 120

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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