The Application: Gas-Pump Controller Design

31 Jul The Application: Gas-Pump Controller Design

The Clean Petroleum Company (CPC) is interested in reducing pollution in the atmosphere.

When people overfill their gas tanks gas is spilled and evaporates causing air pollution. To

minimize this problem, their pumps currently turn off when the back pressure from the gas tank

gets too large while the nozzle handle switch is activated (i.e., compressed).

They have asked you to design a controller that does the following: If the nozzle handle switch is

depressed and the pump pressure sensor indicates low pressure, then allow gas to be pumped. If

the pump pressure sensor indicates high pressure then turn-off the pump. (The system clock

pulses every one second and you may assume that once the pump shuts off, the pump pressure

returns to normal within one second.) Once the pressure returns to normal, allow the pump to be

controlled again by the nozzle handle switch. If the pump pressure sensor indicates high pressure

a second time, your design will permanently shut down the pump until reset by gas station

personnel. (Note that there are two inputs to your synchronous machine: the nozzle handle

switch position, and the pump pressure sensor indicator. Your synchronous machine has one

output that controls the pump.)

All information to complete this design may not be specified. Write down and report any

assumptions that you make in your design.

Be sure to use debounced “logic switches” for driving the clock input to the flip-flops.

31.

LAB MANAGER’S RULES FOR PERFORMANCE

You will only be allowed to do the project during the assigned times. If you miss the

calendar dates, you will not be allowed to do the lab project unless you have a WRITTEN

NOTE signed by your course professor.

2. Hardware Demo: You must have your lab report completed before you start the lab demo since

you will need to give it to the lab TA at the completion of the demo. (Having your report

finished will help you complete the lab project in the allotted time.) YOU WILL NOT BE

ALLOWED TO DO ANY PRACTICE RUNS OF THE LAB PROJECT INSIDE OF

GWC-273. You must be ready to complete the entire lab project when you come into GWC-

273. However, outside of GWC-273 you may consult with anyone you wish to obtain help in

designing the lab project.

3. Hardware Demo: You will have ONLY 2 HOURS to complete the lab project in

GWC-273. You must work alone with no lab partners to assist you. No friends, relatives

or tutors may be with you. You may bring any textbooks, notes, reference books, lab notes,

lab experiments, and lab reports into the GWC-273 lab area. You will definitely need your

PIN-OUT diagrams of the IC chips. You will not be allowed to take any breaks from your

2-hour shift except for restroom and water. (Sorry: but you cannot bring in your own

breadboards and IC chips because that would give you an unfair advantage over other

students in the GWC-273 lab.)

4. Notice: Make sure you do the project ONLY during the hours in which any EEE/CSC 120

Hardware Lab TA is on duty inside of GWC-273. Only these TAs can assist, monitor and check-

off your project. TAs in other courses are not permitted to assist you do the lab project.

5. You will be able to use any of the IC’s we have in the lab for completing your project.

Check in the lab if you are not sure which IC’s are available. Be aware that in ERC 273 we

DO NOT have the following IC’s available: 7421, 7430, 74133, 74174, 74375.

Hardware Lab TA’s on duty will assist you ONLY if there is broken lab equipment.

Hardware Lab TA’s will NOT assist you with troubleshooting or debugging your project

lab design circuit.

Notice: If you are thinking of omitting this lab project from your schedule, be reminded that parts

of this lab project may show up on the final exam for this course!