Control

CAT CA T Engine D-3500B Control System Prepared and Presented

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Contents :

1. D-3500B Control System Features. 2. D-3500B Control System System Benefits. 3. D-3500B Control System System Components. 3.1. Sensors (Control System Input) 3.1.1. Pressure Sensor Sensor.. 3.1.2. Temperature Sensor S ensor . 3.1.3. Throttle Position Sensor. 3.1.4. Speed Sensor Sensor.. 3.2. ECM (Control). 3.3. Output (Actuators).

Contents Contents (Continued): 4. Electronic Circuit Operation 4.1. Speed Timing Circuit  4.2. Throttle Position Sensor Control Circuit. 4.3. Turbocharger Inlet Pressure Sensor Control Circuit. 4.4. Turbocharger outlet Pressure Sensor Control Circuit. 4.5. Engine Oil Pressure Sensor Control Circuit. 4.6. Coolant temperatur temperature e Sensor Control Control Circuit. 4.7. Fuel pressure Sensor Control Circuit. 4.8. Exhaust Temperature Sensor Control Circuit.

1. D-35 D-3500 00B B Cont Contr rol System stem Fea Featu tur res es::

1. Full Full aut autho hori rity ty of of all all Engin Engine e func functi tion ons. s. 2. Elec Electr tron onic ic Spe Speed ed Gov Gover erni ning ng.. 3. Cold old Mod Mode e St Strategy egy. 4. Alt Altitu itude Comp Compen ensa sati tio on. 5. Varia ariabl ble e Inje Inject ctio ion n Timi Timing ng.. 6. Engi Engine ne Mon Monit itor orin ing g and and prot protec ecti tion on.. 7. Opti Optimi mizi zing ng inj injec ecti tion on rat rate. e. 8. Optim Optimizi izing ng Inject Injection ion Pressu Pressure re and Timing. Timing. 9. Co Cont ntrrol Eng Engin ine e fuel fuel to air air rat ratio io.. 10. Control Engine coolant coolant temperature. temperature. 11. Control Control Engine Engine fuel fuel pressure pressure..

2. D-35 D-3500 00B B Con Contr trol ol System stem Be Bene nefi fits ts::

1. 2. 3. 4.

Prec Precis ise e Spee Speed d Co Cont ntrrol. ol. Fast aster Co Cold ld star starti ting ng.. Reduced Reduced Engine Engine Smoke Smoke over over the deferen deferentt opera operating ting condition conditions. s. Elec Electr tron onic ic Engi Engine ne prot protec ecti tion on

3. D-35 D-3500 00B B Cont Contr rol System stem Co Comp mpon onen ents ts::

 D-3500B Engine Control System Consists of the following:

Control system

Input (Sensors)

Pressure sensors

Speed sensors

Temperature Sensors

Control (Electronic Control Module) ECM

Throttle Position Sensor

Output (Actuators)

3. D-350 D-3500B 0B Cont Contro roll Sys Syste tem m Compo Componen nents ts (Conti (Continue nued): d):

Input (Sensors)

3. D-350 D-3500B 0B Cont Contro roll Sys Syste tem m Compo Componen nents ts (Conti (Continue nued): d):

Control (ECM)

D-3500B Control System Components (Continued):

Output (Actuators)

3.1. Sensors (Control System Input):

 Introduction:

Sensors are Simple Electronic Devices that detect and Convert a change in Pressure, Temperature or Electrical movement into an Electrical Signal

 Types of sensors:

1. 2. 3. 4.

Pressure. Temperature. Position. Speed.

3.1.1. Pressure Sensor:

 Introduction  

Sense the changes in pressure and send DC signals to ECM. ECM can detect the fault on the pressure sensor:  Supply Voltage = Signal Voltage (Open Circuit)  Signal Voltage = Zero (Short Circuit)

3.1.1. Pressure Sensor (Continued):

 Pressure sensors used to sense:

1. Oil Pressure. 2. Fuel Pr Pressure. 3. Turb Turboc ochar harger ger Inlet Inlet Pres Pressu sure re.. 4. Turb Turboc ochar harger ger Outl Outlet et Pres Pressu sure re.. 5. Atmo Atmosp sphe heri ricc air air Pres Pressu sure re.. 6. Crank rankca case se Pr Pressu essure re..

3.1.2. Temperature Sensor :

 Temperature Sensors are used to sense the changes of temperature and send a DC

current to the ECM

3.1.2. Temperature Sensor (Continued): (Continu ed):

3.1.3. Throttle Position Sensor:

 Send a DC signal to the ECM with the Desired Which determined by the Operator.

3.1.4. Speed Sensor:

voltage changes, ECM  Due to the change on the Magnetic field, the generated voltage calibrated to detect Engine speed.

3.2. ECM (Control):  Introduction: The Engine Control Module ECM Is the Hart of the Electronic System. System.

3.2. ECM (Continued):

ECM Provides the following features: features:

3.3. Output (Actuators)

 Actuators Provides Provides the following: following:

1. Opti Optimi mize ze inj injec ecti tion on tim timin ing g 2. Gove Govern rnin ing g fue fuell Inj Inject ectio ion n rate. rate.

4. Electronic Circuit Operation

4.1. Speed Timing Circuit:

4.1. Speed Timing Circuit (Continued):

Speed Timing Circuit is the most important circuit in the engine, So the engine will not run if failure done.  Tells The ECM the position and speed of the Cam Shaft.  ECM requires this signal to govern system operation.

4.2. Throttle Position Sensor Control Circuit:

4.2. Throttle Position Sensor Control Circuit (Continued):

Throttle Position Sensor Control Circuit operates as the following: 1. 2. 3. 4.

Operator Operator select select the desired desired engine engine speed speed from the sensor sensor. The sensor sensor send send a signal signal to the ECM with the desired desired engine engine speed speed.. The ECM compare compare between between the actual actual engine engine speed speed and the desired desired.. Base Ba sed d on that that ther there e are are two two case cases: s: I. If the the desir desired ed engine engine speed speed is less less than than the actual actual,, ECM ECM will will incr increas ease e the the duration of the actuators current consequently the amount of injected fuel will increase. II. If the desired desired engine engine speed speed is greate greaterr than than the the actual, actual, ECM will decrease decrease the duration of the actuators current consequently the amount of injected fuel will decrease. decrease.

4.3. Turbocharger Inlet Pressure Sensor Control Circuit:

4.3. Turbocharger Turbocharger inlet pressure pressure sensor control control circuit (Continued):

 This circuit is used to compare between the air pressure upstream and down stream the

air filter.  If the pressure drop exceeds a certain value this means that the air filter is plugged, it may cause engine heat and great engine damage.  In this case ECM will turn on a lamp to indicate that it is significant to change the air filter.

4.4. Turbocharger outlet Pressure Sensor Control Circuit:

4.4. Turbocharger outlet Pressure Sensor Control Circuit  (Cont.): Measures the turbocharger out let pressure pressure at the inlet manifold.  Measures  Send this reading as DC signal to the ECM.  The Engine ECM use this signal to optimize the fuel injection rate to prevent the

Engine black smoke.  As a result the Turbocharger outlet Pressure Sensor Control Circuit control the Fuel to Air ratio.

4.5. Engine Oil Pressure Sensor Control Circuit:

4.5. Engine E ngine Oil Pressure Sensor Control Circuit (Continued):

  

There are two Oil Pressure control sensors to measure the oil pressure After and Before the lubrication oil filter. Sensors send the oil pressure reading as a DC signal to the ECM. If the Oil Pressure is less than a certain value, the engine will perform the following:   Warning.  Derate.  Shut down.

4.6. Coolant temperature Sensor Control Control Circuit:

4.6. Coolant Temperature Sensor Control Circuit  (Continued):  The coolant temperature sensor is used to measure the engine coolant temperature

and send a DC signal to the ECM.  There are three possibilities: I. If the the eng engiine cool coola ant temp temper erat atur ure e is is less than a certain limit , The ECM will operate the cold mode strategy which will advance the injection timing. II. If the the engi engine ne cool coolan antt temp temper eratu ature re is within a certain range, range, The ECM will operate operate the engine in i n Normal Operation. Operation. III. If the the engin engine e coola coolant nt temp temper eratu ature re is Greater than a certain limit , The ECM will perform the following:  Warning.  Derate.  Shutdown.

4.7. Fuel pressure Sensor Control Circuit:

4.7. Fuel Pressure Sensor Control Circuit (Continued):

  

There are two Fuel Pressure sensors to measure the Fuel pressure After and Before the fuel oil filter. Sensors send the fuel pressure reading as a DC signal to the ECM. If the fuel Pressure is less than a certain value, The ECM will turn on a warning Lamp on the operator compartment.

4.8. Exhaust Temperature Sensor Control Circuit:

4.8. Exhaust Temperature Sensor Control Circuit  (Continued):    

There are an exhaust temperature sensor located on each exhaust manifold. Sensor send a DC signal to the ECM. ECM uses this signal to monitoring the excessive engine heat. If the exhaust temperature exceeds a certain limit, ECM will perform:   Warning.  Derate.  Shut down.