约翰迪尔发动机大修时的凸轮轴位置传感器和凸轮轴正时齿轮位置的确定技术方法参数资料

约翰迪尔发动机大修时的凸轮轴位置传感器和凸轮轴正时齿轮位置的确定技术方法参数资料,

Measuring Throttle Position
The 10.5 and 12.5 L engines have the option of operating with a pulse-width-modulated (PWM) throttle signal, an analog throttle position sensor output signal, multi-state throttle, or CAN throttle. In some applications, a backup throttle is used.
Pulse-Width-Modulated (PWM) Throttle 
voltage returning from the potentiometer into a percent of full throttle signal.
Multi-State Throttle
The multi-state throttle is used when a few fixed engine speeds are desired.
The PWM throttle signal is sent to the ECU by  another CAN Throttle
controller. The PWM signal is a square wave signal  with a constant frequency. The pulse width of the  signal varies and indicates the desired throttle opening.
Analog Throttle
An analog throttle signal comes from a potentiometer-type sensor. The ECU converts the 
CAN throttle is information sent to the ECU by another controller over CAN of the desired throttle position.
RG,RG34710,1534   –19–30SEP97–1/1
Determining Engine Speed and Piston Position
Engine speed and precise piston position in relation to Top-Dead-Center (TDC) is determined by the ECU using the crankshaft position sensor and the crankshaft timing wheel. Cylinder identification in relation to the engine firing order is determined by the ECU using the camshaft position sensor, and the camshaft timing wheel. Both sensors operate by detecting notches on a timing wheel. When a notch on the timing wheel is directly under the sensor, a voltage is induced. The ECU monitors this voltage to determine timing wheel position.
Crankshaft Position
The crank timing wheel (A) is located on the front of the crankshaft, behind the pressed-on crank gear (B). The timing wheel is composed of 54 notches, divided into 3 groups of 18 notches. Before the first notch in each group is a flat area equal to 18 of crankshaft rotation, the following 17 notches are separated by 6 of crankshaft rotation. Each group of 18 notches and a flat area is equal to 120, or a third of a full  turn.

Camshaft Position
The camshaft timing wheel (A) consists of 7 notches cut into the center journal of the camshaft. Six of the 7 notches are evenly spaced at 60 center-to-center. Each  of the 6 notches correspond to a cylinder; the 7th notch is located 15 center-to-center before the notch that  identifies cylinder number 1. The ECU has the engine  firing order stored in memory, therefore it knows that following the notch identifying cylinder 1 will be the notch identifying cylinder 5 etc. The camshaft timing wheel turns at one half the speed of the crankshaft timing  wheel.

Crankshaft/Camshaft Position Relationship It then monitors each crank timing notch until the  time
to start injection occurs, at which time it energizes the When the cam position sensor detects the extra notch Electronic Unit Injector (EUI) solenoid to start fuel
on the cam timing wheel, the ECU is informed  that the delivery. notch identifying cylinder 1 is 15 of crank  rotation
away from the cam position sensor, and the  center of It continues to monitor each crank timing notch until the flat area on the crank timing wheel is 30  of crank the time to end injection occurs, at which time  it will rotation away from the crank position sensor. One deenergize the EUI solenoid to stop fuel delivery. timing cycle will then begin when the cam  position
sensor is directly in the center of a notch on  the cam In the event of a crank or cam position  sensor failure, timing wheel. At this time, the crank position  sensor is a “limp-home” mode will allow the ECU to  operate with directly in the center of a flat area on the  crank timing only one position sensor input. If the crank position wheel, and piston number 1 is 69  of crankshaft sensor fails, engine power will be low. If  the cam rotation away from TDC on the compression stroke. position sensor fails, long cranking times will be During the previous 120, the ECU calculated engine required to start the engine. If both sensors  fail, the speed and determined the optimum time to start engine will die and won’t restart.
injecting fuel and the optimum time to stop injecting (determines fuel amount).

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