in this excersice we got given an alternator to dismantle it and do different tests on it to see if they works properly or not.
we follow the instrustions of the booklet,and first we took it all apart and start testing on the rotor winding ground using a muti meter set on 2k OHMs,then we put the black lead of the muti meter to the center of the rotor shaft and the red lead to the slip ring,and we should get around 2-6v as specifaction and we got 3.2v minus the internal resistance of the mutimeter and gave us 2.8 ohms at resulting a pass spec.
To the next step we go to the starter winding,to do this we place the black lead to the meter on the common terminal and the red on each of the other terminals to gain readings of each one,the spec should be 0-2ohms and we got 0.2 0.1&0.1 were the readings and they pass the specification, after this we teste the ground by placing the black lead on the body of the meter.
now we change to diode test mode to test the rectifier positive diodes, place the black lead on to the common terminal and the red to each of the ring winding on at a time. 0.580,0.590,0.579 is the result 3 of the 4 terminals and we have one with no ciruit but it should be the ground so they all pass! and then its the negative diodes, we do the same procedru but puting the red on the terminal body and the black on the terminals,and we should get the same results.
at the end this alternator is a pass after all the tests, all winding internal resistance is between specified spec.
Wednesday, May 4, 2011
Sunday, April 17, 2011
daily report WEEK 4!
tusday april 5th
-today is the first day of electrical and electronics,we went over the laws and basic of ohms+3 triangle formula: 1 to get voltage(v)=current x resistance(R) 2: to get current is voltage/resistance and last is to get Resistance=voltag/current. We also leant how to build up a series circuit, first we connect the power souce to the board,positive wire to the fuse then another wire to the switch,a wire from the switch to the light bulb and wire back to the negative of the battery.
Later on the afternoon we built another circuit with the exact compoent but with 3 big light bulb connected,and we did a cauculation on current on all this bulbs,to measure the current in the circuit we needed the circuit to be broken and the mutimeter to be apart of the circuit. We found out that the currents are the same no matter where you test it.
wednesday april 6
-soo today is another day working circuits,we built a parallel circuit!
so first we power up the circuit board and the positive wire to the fuse and to the switch,and then we have 2 wires to the first bulb each,then from both bulb a wire connect to the negative of the battery, we also did the voltage drop and the aviable voltage on this parrallel circuit, to measure voltage in a circuit the circuit must be prarallel connected and to measure voltage drop in a circuit,and the mutimeter must connected to the input and the output of the component is measuring,and to measure aviable voltage and red and black probe needs to go to the negative and the red to the positve,likewise to avoild blowing up the fuse.
thursday april 7
-soo today we are making the logic probe,that its to check power in a power source like a battery, material used in this was a brass rod(conductor) 1 red led light and 1 green LED,a black meter 1 black alligator clip, a red alligator clip also plastic tubing. after awhile i got the probe done and tested and its ok,for this to work on the car you put the neg and pos on the neg postive on the battery.
Friday april 8
-we did both series on parallel and series into one,we put two bulbs in a parrael and one in a series,with the fuse,power and switch wires,two wires in each for the first 2 bulb,one parallel negative connect to the negative in the series bulb and back to the negative of the battery.after that we measure the resistance of each bulb using R=V/C and for watts is w=V x C. the avaiable voltage in the parallel bulbs are 8v each and none in the series circuit.
-today is the first day of electrical and electronics,we went over the laws and basic of ohms+3 triangle formula: 1 to get voltage(v)=current x resistance(R) 2: to get current is voltage/resistance and last is to get Resistance=voltag/current. We also leant how to build up a series circuit, first we connect the power souce to the board,positive wire to the fuse then another wire to the switch,a wire from the switch to the light bulb and wire back to the negative of the battery.
Later on the afternoon we built another circuit with the exact compoent but with 3 big light bulb connected,and we did a cauculation on current on all this bulbs,to measure the current in the circuit we needed the circuit to be broken and the mutimeter to be apart of the circuit. We found out that the currents are the same no matter where you test it.
wednesday april 6
-soo today is another day working circuits,we built a parallel circuit!
so first we power up the circuit board and the positive wire to the fuse and to the switch,and then we have 2 wires to the first bulb each,then from both bulb a wire connect to the negative of the battery, we also did the voltage drop and the aviable voltage on this parrallel circuit, to measure voltage in a circuit the circuit must be prarallel connected and to measure voltage drop in a circuit,and the mutimeter must connected to the input and the output of the component is measuring,and to measure aviable voltage and red and black probe needs to go to the negative and the red to the positve,likewise to avoild blowing up the fuse.
thursday april 7
-soo today we are making the logic probe,that its to check power in a power source like a battery, material used in this was a brass rod(conductor) 1 red led light and 1 green LED,a black meter 1 black alligator clip, a red alligator clip also plastic tubing. after awhile i got the probe done and tested and its ok,for this to work on the car you put the neg and pos on the neg postive on the battery.
Friday april 8
-we did both series on parallel and series into one,we put two bulbs in a parrael and one in a series,with the fuse,power and switch wires,two wires in each for the first 2 bulb,one parallel negative connect to the negative in the series bulb and back to the negative of the battery.after that we measure the resistance of each bulb using R=V/C and for watts is w=V x C. the avaiable voltage in the parallel bulbs are 8v each and none in the series circuit.
Saturday, April 16, 2011
Tuesday, March 29, 2011
T Tech 484390-inputs/outputs report
Throttle position sensor
- This sensor informs the ECU the throttle position and uses this input to change the spark timing and fuel mixture as the engine load changes, when the throttle is on idle the voltage is around 0.618 and when the throttle is wide open(accelerate) the voltage will rise to 4.1v(from the engine we look at)
Inputs/outputs
-These are referred to the communication between a information processing system(like the ECU or a computer we uses everyday) inputs are the signals recived by the system(sensor/compoent) and the outputs are the signal thats sent from it. For a car the sensors in the car does the meassuring of temp/viration/air and sends the info to the ECU and outputs the needed performance and driveability to the very best at its certain situation
open loop/close loop
-An open loop is a controller that does not uses the feedback from the inputs to determine the outputof the processes that it is controlling,it can not correct the error/faults that it could make,as in the engine the ECU is not using any data/signal from the O2 sensor and progress itself! things could go wrong if any one of the sensor is the funtioning properly,this could led to the car not running at all and also it will not switch to close loop mode.
- Close loop is when the car is on idle or driving very slow like cruising.
throtte body sensor
-this sensor is a to monitor the throtte in the combustion camber,it tell you the angel of the throtte is at so the ECU will know how much power to produce for the vehicle to run.
AIR thermistor
- this is a sensor that measures temp in air for the ECU to know if the vehicle needed more or less air,the votlage for the cold engine is 1.473v and when is wormed its 3.25v
water thermistor
-this measures the temp for water, the ECU needs to know how much fuel the engine needs.when the engine is cold the temp is 3.387v and a warmed up engine is 1.08v
MAP sensor A.K.A manifold absoulute pressure sensor
-this sensor meassure the pressure in the intake manilfold,you will most likely to find this sensor near the throtte body, when the engine is cold the voltage of this is 1.784v and when its warmed it decreased to 0.370v,the sensor has 4 main compoent, one is the ground,output voltage, 5 volt input and the vacuumfitting.
crankshaft sensor
- the crankshaft sensor is to position the crankshaft, the ecu uses them info to transmitted by sensor to control such as ignition timing,fuel injector timing.
- This sensor informs the ECU the throttle position and uses this input to change the spark timing and fuel mixture as the engine load changes, when the throttle is on idle the voltage is around 0.618 and when the throttle is wide open(accelerate) the voltage will rise to 4.1v(from the engine we look at)
Inputs/outputs
-These are referred to the communication between a information processing system(like the ECU or a computer we uses everyday) inputs are the signals recived by the system(sensor/compoent) and the outputs are the signal thats sent from it. For a car the sensors in the car does the meassuring of temp/viration/air and sends the info to the ECU and outputs the needed performance and driveability to the very best at its certain situation
open loop/close loop
-An open loop is a controller that does not uses the feedback from the inputs to determine the outputof the processes that it is controlling,it can not correct the error/faults that it could make,as in the engine the ECU is not using any data/signal from the O2 sensor and progress itself! things could go wrong if any one of the sensor is the funtioning properly,this could led to the car not running at all and also it will not switch to close loop mode.
- Close loop is when the car is on idle or driving very slow like cruising.
throtte body sensor
-this sensor is a to monitor the throtte in the combustion camber,it tell you the angel of the throtte is at so the ECU will know how much power to produce for the vehicle to run.
AIR thermistor
- this is a sensor that measures temp in air for the ECU to know if the vehicle needed more or less air,the votlage for the cold engine is 1.473v and when is wormed its 3.25v
water thermistor
-this measures the temp for water, the ECU needs to know how much fuel the engine needs.when the engine is cold the temp is 3.387v and a warmed up engine is 1.08v
MAP sensor A.K.A manifold absoulute pressure sensor
-this sensor meassure the pressure in the intake manilfold,you will most likely to find this sensor near the throtte body, when the engine is cold the voltage of this is 1.784v and when its warmed it decreased to 0.370v,the sensor has 4 main compoent, one is the ground,output voltage, 5 volt input and the vacuumfitting.
crankshaft sensor
- the crankshaft sensor is to position the crankshaft, the ecu uses them info to transmitted by sensor to control such as ignition timing,fuel injector timing.
Wednesday, November 17, 2010
Friday, November 12, 2010
Thursday, November 11, 2010
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