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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
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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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.³ 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 20 40 60 80 Vehicle speed (mph) 100 120
Transcribed Image Text: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.³ 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 20 40 60 80 Vehicle speed (mph) 100 120
Engine output power (hp) 160 120 80 40 0 2000 3000 Engine speed (rpm) FIGURE 1.8 Engine output power versus engine speed. Typical 350-in.³ V-8 engine. 1000 4000 5000
Transcribed Image Text:Engine output power (hp) 160 120 80 40 0 2000 3000 Engine speed (rpm) FIGURE 1.8 Engine output power versus engine speed. Typical 350-in.³ V-8 engine. 1000 4000 5000
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