Many places in the world, equipment maintenance is normally carried out on Break down of the equipment. Not before No breakdown preventive maintenance are carried out in time. Even maintenance is done by choice or optional And others are by calculation that are done manually and not in technical way And some are reminded by professional and sometimes not done at all because it has escaped one or two people.This project will prove to be a n useful piece of equipment in order to carry out breakdown preventive maintenance. Periodic preventive maintenance cannot be done without keeping a watch on to the running hours of the engine .this can only be achieved by using a real-time clock into the circuit, which can keep the account of engine running.
Block Diagram
the on
board timer0 is used for programming to achieve the clock function. This clock only runs
when engine is running otherwise it does not advance. An engine starting
information must be fed to microcontroller in order to start the clock. Most of
the engines have tacho generator connected, output of the tacho-generator
should be used in such a way that it energises the relay and the, active close
contacts can be used to signal the microcontroller to start the clock function.
When engine stops, techo generator output will become zero, Relay circuit will
de-energise and normally close contact will open and microcontroller clock
function will halt.
Two line by 16 character
LCD has been used for indication purpose. When the engine is at halt, LCD will
show previously engine driven period in hours and in minutes. When engine is
running, clock running (red)LED will blink (one sec off, one sec on) that
indicate that internal clock has started, also the LCD will be updated by the
program , you can see the minutes and hours being advanced. Most of the engines are connected with the various safety
devices .Fuel, lubrication oil, cooling water and air; these must be filtered
before fed to engine. They should be fed at a proper pressure as described in
the engine operating manual.
With
the prolong use, these filter need to be cleaned, as the filter get clogged the
pressure will start falling. Safety device connected with the particular filter
and pressure switch will raise an alarm whenever any of these parameters rises
above or below the normal
operating range. All of these sensors have a relay circuit to sound an alarm
bell or to give a signal to the external devices.
In this project we have
four of these input points. Input from the various sensors will come to these points;
these are oil sensor, fuel sensor, air sensor and velocity sensor. As explained
before when ever any sensor get actuated,it enerzises a relay which makes the
contacts which are connected to external alarm circuit. Also With this project,
short these input terminal points with the piece of wire in order to actuate
the alarm circuit. Oil viscosity is the property of the oil it changes with the
temperature and use .It should also be within the range as specified in the
operating manual of the engine. It matter most in the hydraulic equipments,
increase in viscosity lowers the performance of the engine. Indication panel
has five LED’s to indicate the various alarming conditions along with the sound
buzzer.
Power supply section supplies regulated 5v dc to micro-controller and other circuit and 12v supply for the shut down relay.
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