345B, 345B Series II and W345B Series II Excavators Engine and Pump Control Engine and Hydraulic Pump Controller Caterpillar


Engine and Hydraulic Pump Controller
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1.1. Input/Output
2.1. Input
3.2. Switch Input (Key start switch)
4.2. Switch Input (Operational Type)
5.2. Sensor Input (Frequency)
6.2. Sensor Input (Alternator)
7.2. Sensor Input (PWM)
8.2. Sensor Input (Voltage)
9.1. Output



Illustration 1g00662501

Diagram Of The Engine Control and Hydraulic Pump Control

(1) Controller

(2) Connector 2

(3) Connector 1

Table 1
Engine And Hydraulic Pump Control (Connector 2) (1)    
No.1     Function     Type    
2     Front Pump
Pressure Sensor    
Sensor Input (Freq.)    
3     Proportional Reducing
Valve (+)    
Solenoid Output (Pulsed)    
4     Proportional Reducing
Valve (-)    
Solenoid Output (Pulsed)    
6     AUX Pressure     Switch Input (Operational)    
7     Implement Pressure     Switch Input (Operational)    
8     Boom Raise Pressure     Switch Input (Operational)    
12     Trenching Solenoid     Solenoid Output (On/Off)    
15     Coolant Level     Switch Input (Operational)    
18     Travel Pressure     Switch Input (Operational)    
21     Level Finish Solenoid     Solenoid Output (On/Off)    
22     Travel Speed Solenoid     Solenoid Output (On/Off)    
24     Engine Speed (+)     Sensor Input (Freq.)    
25     Engine Speed (-)     Sensor Return    
26     Engine Oil Pressure     Switch Input (Operational)    
27     Swing Brake Solenoid     Solenoid Output (ON/OFF)    
29     Fuel Level     Sensor Input (Voltage)    
30     Hydraulic Oil Temperature     Sensor Input (Voltage)    
31     Travel Alarm     Solenoid Output (On/Off)    
34     Alternator "R" Terminal     Sensor Input (Alternator)    
35     Air Cleaner     Switch Input (Operational)    
36     Engine Oil Level     Switch Input (Operational)    
38     Monitor (+)     Power    
40     Hydraulic Oil Level     Switch Input (Operational)    
( 1 ) The connector contacts that are not listed are not used. The connector has 40 contacts.

Table 2
Engine And Hydraulic Pump Control (Connector 1) (1)    
No.1     Function     Type    
1     +Battery (Unswitched)     Power    
2     Ground     Ground    
3     +Battery (Switched)     Switch Input (Key start)    
11     +Battery (Unswitched)     Power    
12     Ground     Ground    
13     Engine Speed Dial S1     Switch Input (Operational)    
14     Engine Speed Dial S2     Switch Input (Operational)    
15     Data Link (+)     Input/Output    
16     Data Link (-)     Input/Output    
19     Data Link (+)     Input/Output    
20     Data Link (-)     Input/Output    
22     Fine Swing     Switch Input (Operational)    
23     Engine Speed Dial S3     Switch Input (Operational)    
24     Engine Speed Dial S4     Switch Input (Operational)    
30     Electronic Governor Throttle     Output (PWM)    
31     RS232C (TX)     Input/Output    
32     RS232C (RX)     Input/Output    
33     RS232C (GND)     Input/Output    
34     Low Idle     Switch Input (Operational)    
39     Hydraulic Oil Filter Switch     Switch Input (Operational)    
( 1 ) The connector contacts that are not listed are not used. The connector has 40 contacts.

The controller sends a PWM signal to the engine ECM through contact 1-30. If the engine speed dial is in the position of 10, the engine and pump controller will maintain the engine rpm according to the position of the engine speed dial and the actual engine rpm. With the engine speed dial in a position of 1 through 9, the controller will maintain the rpm of the engine according to the position of the engine speed dial. Position 1 through 9 of the engine speed dial will send a unique signal and a constant signal to the engine ECM according to the position of the switch. The engine and pump controller will vary the signal to the engine ECM when the engine speed dial switch is in the position of 10. The controller will adjust the output of the hydraulic pump in order to maintain the target speed for the engine. According to the position of the engine speed dial, the controller will send a corresponding signal to the power shift solenoid.

Input/Output

Each input and output of the controller is connected to the machine harness through two 40-pin connectors. The data link is a bidirectional component. The data link allows the engine and pump controller to receive information and the engine and pump controller can send information. The data link is designed to allow communications between the controller, the monitor and the engine ECM. The data link is not a visible component. The data link consists of internal control circuits and the connecting harness wiring. The controller sends information through the data link. The following list contains some examples: fuel level, engine coolant temperature and the power mode that is selected to the monitor panel. The controller also receives requested information from the monitor panel. The following list contains some examples: power mode and fine control mode.

Input

Each input will describe the status of the machine system. Two types of inputs are used: switch type and sensor type. Switches and harnesses provide an open or ground to the controller. Sensors and harnesses provide a signal that changes to the controller.

Switch Input (Key start switch)

The input of the key start switch connects to the controller through connector 1 and contact 4. The key start switch will provide input information to the controller about the status of the key start switch. The input will receive +battery voltage with the key start switch in the ON position.

Switch Input (Operational Type)

Each switch input will provide information about operator requests and machine systems. The condition of the system is sent to the controller through each input. The status of each input will be grounded, open or +battery. Each input of the controller will receive information from the switches that are located in the machine systems (pressure and temperature).

Sensor Input (Frequency)

An AC signal is present for the input of the frequency sensor. The AC signal is used to represent the speed of a machine system. The engine speed sensor provides an AC signal to the controller. The controller measures the frequency (Hz) of the AC signals. The resulting speed is used by the controller to make decisions.

Sensor Input (Alternator)

The sensor input for the alternator connects to connector contact 2-34. A square wave signal is present at this input. The signal is used to represent the speed of the alternator. The controller measures the frequency (Hz) of the square wave signal. The controller uses this information to make determinations and the controller uses this information to monitor the output of the alternator. When an abnormal condition exists, the controller will alert the operator.

Sensor Input (PWM)

A PWM signal is present at these contacts. This signal will represent the condition of a machine system. For example, the controller can monitor temperature. PWM sensors provide this information. The controller measures the duty cycle of the PWM signal. This signal will represent the information that is measured. The controller will use this information to perform decisions. When an abnormal condition exists, the controller will alert the operator.

Sensor Input (Voltage)

Voltage will represent the condition of a machine system. For example, the level of voltage is a condition that is monitored by the controller. Analog sensors or senders provide this information. The controller measures the voltage, which represents the measured information. The controller uses this information to make decisions. The controller also uses this information to monitor machine systems. When an abnormal condition exists the controller alerts the operator.

Output

The controller responds to decisions by sending electrical signals through the various outputs. The outputs will create an action or the outputs will provide information. Three status indicators inside the controller that are connected to the monitor panel are outputs of the controller. These outputs are additional to the outputs that are listed in the table for Connector Contact Description. The monitor panel shows the operating status of the engine and pump control system and diagnostic information. An output can be used to perform any of the following functions:

  • Energizing a solenoid

  • Sounding an alarm

  • Activating a motor

Information System:

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