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--- devel:patches [2014-08-04 10:40] – 174.139.74.229
+++ devel:patches [2014-08-04 19:13] – old revision restored (2014-05-06 19:55) 2001:4dd0:ff00:8eb9:acc7:2656:646b:d2f0
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-Understanding Car Computers, Sensors and Actuators
+====== Sending Patches =======
+The preferred way of contributing patches to DokuWiki is using [[github|Github pull request]], this makes it much easier to review the code collaboratively and discuss it before applying it to the code base.
-The present day car today features a computer, which will help in running the engine. This hub is supposed for that one who is interested to learn how computers are currently utilized in an automobile, and exactly how everything works.
+When the patch has been applied, don't forget to update the [[:manual|DokuWiki Manual]] ;-). You can use a link to [[devel:develonly|devel:develonly]] to inform users that this feature is not available in the latest [[:changes|stable release]]. When this documentation update is not yet performed, in Github the label ''needDocUpdate'' should be added.
-ok lets get it done...
+====Without Github...====
+When you really don't use Github, your patches should be sent to the [[:mailinglist]]. Patches created by [[devel:git]] are preferred and much simpler to integrate. If git is not an option, you should create patches in unified diff format (''diff -u'') against the latest available {{http://github.com/splitbrain/dokuwiki/tarball/master?.tgz?|daily snapshot}}.
-Think of a decision maker of any sort, whether a director of any company or possibly a doctor treating the patient.
-To ensure that the director of the company to direct others, they needs information to cooperate with. Which information derives from individuals working under the director (subordinates).
-In the matter of a health care professional the knowledge derives from the person so as to diagnose the person correctly. I'll keep with the director with the company example on this hub.
-Sample Company Structure
-Sample Company Structure
-Source: Open Office
-The primary job of an director is always to gather all the information from her or his subordinates to make decisions. The harder accurate the info the greater decisions are manufactured because of the director.
-For example, an item has been created and is now ready for launch in the market so the director will get the information in the production team and can instruct the salesforce to start selling the product. Here timing is vital, if the production team are making an item yet not informed the director not a soul will likely be selling the item along with the optimum performance on the company will go down.
-Exactly like the director/production team/sales team, in the vehicle we now have a Computer, Sensors and Actuators.
-Edited Pic
-Edited Pic
-Now suppose the car to be a company.
-Laptop computer would be the director, the sensors are the location where the information comes from (production team) and the actuators will be the instruction followers (sales force).
-And so the computer makes each of the decisions according to everything it gets through the sensors. Laptop then analyzes the info on the sensors and tells the actuators things know about. Greater accurate the info from your sensors better decisions are going to be made by laptop computer.
-Car Computer
-Car Computer
-Source: Howstuffworks
-MAP Sensor
-MAP Sensor
-Source: OBD Codes
-Typical Fuel Injector - Actuator
-Typical Fuel Injector - Actuator
-Source: Fuel Injector Problems
-But exactly how would it all work in the car?
-The simple answer is voltage.
-Every sensor produces a certain amount of voltage (between 0 and 5V) based on the conditions surrounding the sensor. Each sensor is directly connected to the computer which has a wire.
-I'll give you a actual example now,
-You commence the car and are also ready to go. You press the accelerator pedal to go forward.
-Here a sensor called Throttle position sensor moves while using the pedal (that come with a cable to engine). You may also think of the Throttle position sensor to be a regulator (light switch) to dim lights or set the fan speed in your house, greater current you allow, the brighter the sunshine or faster the fan.
-This throttle position sensor tells the computer on the car that this driver is pressing the throttle, your computer may also verify these details with the sensor called the MAP sensor (manifold absolute pressure). The MAP sensor monitors air pressure within the engine.
-So, the engine begins, the throttle position sensor is signalling that the driver is pressing the gas then there is greater than normal air pressure in the engine (intake) area, therefore computer decides we must accelerate, and knows to be able to accelerate we will require more fuel.
-The pc then instructs the fuel injectors (actuators) to open for a longer duration because i am accelerating. This is accomplished by sending current to the actuator for a longer period.
-Thus the car has got the proper amount of fuel to accelerate and you spot the car moving smoothly.
-When the sensors get dirty their accuracy of information is decreased and therefore the computer starts handing out the wrong commands as well as the overall performance on the car sets. A few examples occasionally includes increased fuel consumption, or slower acceleration.
-Typical Check Engine Light
-Typical Check Engine Light
-Source: Check Engine
-The computer knows kids of voltages allowed for specific sensors if the voltage readings are beyond range you have the check engine light with your dashboard. You'll get the check engine light when a wire going through the computer for the sensor is broken or in the event the sensor is faulty.
-To reduce the check engine light you simply must go to the dealership or possibly a local mechanic who has a scanner to your specific vehicle. There are many scanners on the market for specific cars. The retail price array of scanners are between $50 - $4,000. The scanners basically offer a code and also a description with the problem which help locate the issues inside the vehicles much faster. To locate a long description you can utilize the online world and look for OBD-II codes.
-(OBD = On-Board Diagnostics)
-Once the problem is fixed the check engine light will automatically implode.
-Using the advancement of technology several sensors and actuators together with multiple computers have been introduced inside functioning of your vehicle. This hub gave an example of one decision that your car makes, but cars today might make upto as well as over 2000 decisions every second while driving.
-Next we can look at the types of controllers obtained in a motor vehicle.
-http://www.obdvip.com/
-http://www.obdvip.com/heavy-duty-diagnostic.html
-http://www.obdvip.com/mvp-pro-m8-key-programmer.html
-http://www.obdvip.com/benz-diagnostic-tool.html