12_throttle pto.pdf

8/15/2019 12_throttle pto.pdf

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MBE ELECTRONIC C ONTROLS APPLICATION AND INSTALLATION

5.12 THROTTLE CONTROL/GOVERNORS

There are two types of engine governors that are used with throttle controls. The engine

governors are:

The Automotive Limiting Speed Governor (ALSG) for torque control, typical governor for

on-highway applications(refer to section 5.12.1)

The Power Tak e-off (PTO) for speed control, typical variable speed governor (VSG) for

off-highway applications (refer to section 5.12.2)

5.12.1 AUTOMOTIVE LIMITING SPEED GOVERNOR - ON-HIGHWAY

In on-highway applications and some nonroad applications, ALSG is the primary throttle source.

The throttle input in a ALSG sets percent load. The amount of fuel input to the engine is

determined by the throttle position. As the load on the engine varies the resulting engine speed

will vary between idle speed and rated speed.

ALSG Accelerator Pedal

The accelerator pedal (AP) sends an input signal which the ALSG uses to calculate engine power

proportional to the foot pedal position. This assembly is also referred to as the Accelerator

Pedal Sensor (AP Sensor) assembly.

ALSG Accelerator Pedal Installation

MBE Electronic Controls are compatible with an AP which has an output voltage that meets SAE

J1843 and has less than 5% of voltage supply closed throttle variability.

The AP is an OEM supplied part. Vendor sources that may be contacted for additional designand installation details.

NOTE:An Idle Validation Switch is required.

Williams Controls

14100 S.W. 72nd Avenue

Portland, Oregon 97224

Phone: (503) 684-8600

www.williamscontrols.com

See Figure 5-17 for installation requirements.

All information subject to change without notice. (Rev. 7/03) 5-737SA822 0307 Copyright © 2003 DETROIT DIESEL CORPORATION


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FEATURES

Figure 5-17 Accelerator Pedal Installation

An Idle Validation Switch is required and uses two digital inputs. Refer to section 4.2, "Digital

Inputs," for additional information.

ALSG Electronic Foot Pedal Assembly Diagnostics

An Idle Validation Switch inputs provide redundancy to assure that the engine will be at idle in

the event of an AP in-range malfunction. The Idle Validation Switch is connected to two digital

inputs on the VCU. When the Idle Validation Switch on the AP is switched to battery ground, theengine speed will be at idle.

5.12.2 POWER TAKE-OFF

PTO control is available to fuel the engine in order to keep the selected PTO speed regardless of

engine torque without driver interaction. The engine torque cannot exceed a programmed limit.

Upon startup the engine will go to the speed selected by the PTO throttle position.

The PTO throttle control options are:

Cab PTO – Cruise Switch PTO

Remote PTO

Analog PTO

5-74 All information subject to change without notice. (Rev. 7/03)7SA822 0307 Copyright © 2003 DETROIT DIESEL CORPORATION


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NOTE:Software version Rel. 12.0 or later, the park brake function could be enabled/disabledand the logic for the park brake may be inverted.

See Figure 5-18 for a diagram of PTO logic.

Figure 5-18 PTO Logic



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FEATURES

Cab PTO – Cruise Switch PTO

The Cruise Control switches are used to activate and control the Cruise Switch PTO (Cab PTO)

option.

NOTE:

Cab throttle and remote throttle can be overridden with the accelerator pedal unless“PTO Throttle Override” is disabled.

The Cruise On/Off switch must be turned ON and the park brake must be engaged (software Rel

11.02 or later) to enable this feature if parameter 1:11:30 as listed in Table 5-50 is set to 1. If

Cruise Switch PTO is inactive and the Cruise Switch PTO conditions are met, pressing and

releasing the Resume/Accel Switch will activate Cruise Switch PTO at the Resume PTO Speed.

Pressing and releasing the Set/Coast Switch will activate Cruise Switch PTO at the Set PTO Speed.

The Resume PTO Speed and the Set PTO Speed can be programmed with the VEPS or minidiag2

and cannot be greater than the PTO maximum speed or lower than the PTO minimum speed.

Once the PTO set speed is established, the Resume/Accel Switch can be used to increment the set

speed at a rate of 200 rpm/sec (programmable). Releasing the Resume/Accel Switch will set theengine speed at the current operating speed.

The Set/Coast Switch will decrement the set speed at a rate of 200 rpm/sec (programmable),

down to the minimum PTO speed. Releasing the Set/Coast Switch will set the engine speed at

the current operating speed.

Remote PTO speed is disabled for any of the following:

Turning the Cruise Master Switch off

Vehicle speed is greater than Max Vehicle Speed in PTO (programmable – default 9.6 km/h)

VSS fault

Clutch Released Pedal or Service Brake Pedal are pressed - optional

Park Brake is off (if configured)

If PTO Throttle Override is enabled, the throttle pedal can override the PTO engine speed up to the

maximum engine speed for Throttle Override. Throttle pedal or remote throttle engine speed can

override once the current PTO engine speed is reached. The previous PTO set speed will become

active again, if it is greater than the engine speed equivalent to the throttle pedal percentage.



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See Figure 5-19 for a diagram of Cab PTO Mode

Figure 5-19 Cab PTO Mode



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FEATURES

Cruise Switch PTO Programming Requirement and Flexibility

The digital inputs listed in Table 5-49 are required for Cruise Switch PTO. These digital inputs

may be configured with VEPS or the minidiag2.

Digital Input Type VCU

Pin

Default Parameter ID

Cruise Master

Switch Digital Input or J1939 18/6 1 = Enabled 1 13 27

Service Brake

Switch (optional) Digital Input or J1939 21/15 1 = Enabled 1 13 05

Transmission Type Digital Input or J1939 18/2

0 = Manual transmission with

clutch switch

1 = Automated transmission

with clutch switch

2 = Automatic transmission

without clutch switch

1 11 26

Set/Coast Switch Digital Input or J1939 18/4 1 = Enabled 1 13 23

Resume/Accel

Switch Digital Input or J1939 18/5 1 = Enabled 1 13 22

Park Brake Switch Digital Input or J1939 21/16 1 = Enabled 1 13 07

Table 5-49 Cruise Switch PTO Digital Inputs

The parameters listed in Table 5-50 can be set with VEPS or the minidiag2.



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Parameters Description Default Range Parameter

ID

PTO Function Enables/disables the PTO function 1 0 = Disabled

1 = Enabled 1 11 01

Max PTO Speed Sets the max PTO speed 1200 RPM 500 – 3000 RPM 1 11 02

Min PTO Speed Sets the min PTO speed 500 RPM 500 – 3000 RPM 1 11 03

PTO Throttle

Override

Enables/disables the throttle pedal

from overriding PTO mode. 0 = Disabled

0 = Disabled

1 = Enabled 1 11 04

Max Engine

Speed for

Throttle Override

Sets the max engine speed that

the throttle can obtain when in PTO

mode.

1400 RPM 0 – 3000 RPM 1 11 05

PTO Dropout on

Service Brake

Switch

Enables/Disables the status of the

Service Brake Switch for disabling

of PTO

1 = Enabled

(Service Brake

Switch will

disable PTO)

0 = Disabled

1 = Enabled 1 11 06

PTO Dropout on

Clutch Switch

Enables/Disables the status of the

Clutch Switch for disabling of PTO

1 = Enabled

(Clutch Switch

will disable PTO)

0 = Disabled

1 = Enabled 1 11 07

Max Vehicle

Speed in PTO

Sets the max vehicle speed over

which PTO is disabled 9.6 km/h 0 – 128 km/h 1 11 08

Cruise Set PTO

Speed

Sets the initial speed when the

Set/Coast Switch is used to enable

Cab PTO

950 RPM Min PTO Speed to

Max PTO Speed 1 11 09

Set PTO Max

Engine Torque

Sets the max engine torque that

becomes active once the Set/Coast

Switch is activated

600 Nm 0-5000 Nm 1 11 11

Cruise Resume

PTO Speed

Sets the initial speed when the

Resume/Accel Switch is used to

enable Cab PTO

950 RPM Min PTO Speed to

Max PTO Speed 1 11 12

Resume PTOMax Engine

Torque

Sets the max engine torquethat becomes active once the

Resume/Accel Switch is activated

600 Nm 0-5000 Nm 1 11 14

PTO Ramp Rate Sets the rate of increase or

decrease. 200 RPM/sec 25 – 2500 RPM/sec 1 11 15

Park Brake Logic

with PTO

Sets the park brake logic to be

used with PTO

1 = Park Brake

must be applied

for PTOoperation

0 = – Park Brake must

not be applied for

PTO operation

1 = Park Brake must

be applied for PTO

operation

1 11 30

Enable Park

Brake with PTO

Enables/Disables the requirement

to use the park brake status when

in PTO mode

1 = Enabled (park

brake required)

0 = PTO does not

require park braketo be enabled.

1 = Enabled (park

brake required,

1:11:30 value must

be 1 to activate PTO)

1 11 31

Table 5-50 Cruise Switch PTO Parameters



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FEATURES

Remote PTO Mode

The Remote PTO will override the Cab PTO mode when the Remote PTO Switch input on the

VCU (18/10) is grounded. Remote PTO will also override throttle pedal and remote throttle

unless “PTO Throttle Override” is disabled. The active throttle will override Remote PTO if

“PTO Throttle Override” is enabled.

The preset speed is selected by enabling the remote PTO switch once for PTO Speed #1, twice

for PTO Speed #2, and three times for PTO Speed #3. These preset speeds can be set with the

minidiag2.

Remote PTO speed is disabled for any of the following:

Turning the Remote PTO switch off for more than two seconds

Vehicle speed is greater than Max Vehicle Speed in PTO (programmable – default 9.6 km/h)

VSS fault

Clutch Released Pedal or Service Brake Pedal are depressed

Park Brake is off (Software rel. 11.02 or later)

NOTE:If the condition that disabled Remote PTO is inactive again, Remote PTO willautomatically start again. PTO #1 Set speed will be used.

If PTO Throttle Override is enabled, the throttle pedal can override the PTO Engine speed up

to the Maximum Engine Speed for Throttle Override. If the throttle pedal or remote throttle

engine speed is less than current PTO engine speed a dead band will occur. The previous PTO set

speed will become active again, if it is greater than the engine speed equivalent to the throttle

pedal percentage.

If remote PTO is active and then disabled due to one or more disabling condition, PTO mode willautomatically reactivate when the disabling condition is removed.



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See Figure 5-20 for a diagram of Remote PTO Mode.

Figure 5-20 Remote PTO Mode

Remote PTO Programming Requirement and Flexibility

The parameters listed in Table 5-51 can be set with VEPS or the minidiag2.



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FEATURES

Parameters Description Default Range Parameter

ID

PTO Function Enables/disables the PTO

function 1

0 = Disabled

1 = Enabled 1 11 01

Max PTO Speed Sets the max PTO speed 1200 RPM 500 – 3000 RPM 1 11 02

Min PTO Speed Sets the min PTO speed 500 RPM 500 – 3000 RPM 1 11 03

PTO Throttle

Override Enable

Enables/disables the feature to

override the current PTO set

speed using the throttle pedal.

1 = Enabled 0 = Disabled

1 = Enabled 1 11 04

Max Engine Speed

for Throttle Override

Sets the max engine speed that

the throttle can override the PTO

set speed.

1400 RPM 0 – 3000 RPM 1 11 05

PTO Dropout on

Service Brake

Switch

Enables/Disables the status of

the Service Brake Switch for

disabling of PTO

1 = Enabled

(Service Brake

Switch will

disable PTO)

0 = Disabled

1 = Enabled 1 11 06

PTO Dropout on

Clutch Switch

Enables/Disables the status of

the Clutch Switch for disabling of

PTO

1 = Enabled

(Clutch Switch

will disable PTO)

0 = Disabled

1 = Enabled 1 11 07

Max Vehicle Speed

in PTO

Sets the max vehicle speed over

which PTO is disabled 9.6 km/h 0 – 128 km/h 1 11 08

PTO Ramp Rate Sets the rate of increase or

decrease when in PTO mode. 200 RPM/sec 25 – 2500 RPM/sec 1 11 15

Number of Remote

PTO Speed

Sets the number of remote PTO

speeds that can be enabled 1 1 to 3 1 11 16

PTO Speed #1 Sets the PTO #1 set speed 950 RPM Min PTO RPM to

Max PTO RPM 1 11 17

PTO Speed #1 Max

Engine Torque

Sets the max engine torque for

PTO Speed #1 600 Nm Low Idle - 5000 Nm 1 11 19

PTO Speed #2 #2 PTO set speed 950 RPM Min PTO RPM to

Max PTO RPM 1 11 20

PTO Speed #2 Max

Engine Torque



PTO Speed #3 #3 PTO set speed 950 RPM Low Idle - 5000 Nm 1 11 23

PTO Speed #3 Max

Engine Torque



Park Brake Logic

with PTO

Sets the park brake logic to be

used with PTO

1 = Park

Brake must be

applied for PTO

operation

0 = Park Brake must

not be applied for

PTO operation

1 = Park Brake must

be applied for PTOoperation

1 11 30

Enable Park Brake

with PTO

Enables/Disables the

requirement to use the park

brake status when in PTO mode

1 = Enabled

(park brake

required)

0 = Disabled (park

brake not required)

1 = Enabled (park

brake required)

1 11 31

Table 5-51 Remote PTO Parameters



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Installation

The Remote PTO Switch is wired to pin 18/10 of the VCU/ADM2–FR. See Figure 5-21.

Figure 5-21 Remote PTO Switch

Analog PTO

A Remote Accelerator Pedal can be installed to control either an analog Remote PTO (VSG) or

analog Remote Accelerator Pedal (ALSG).

The Remote PTO will start when the Remote PTO switch is switched to battery ground. The

Remote PTO logic will override the Cab PTO. Cab throttle and remote throttle are also overridden

unless “PTO Throttle Override” is disabled. When ALSG operation is required, the Remote

Accelerator Switch is switched to battery ground.

The Remote Accelerator Switch Select input (VCU, 18/7) determines the active throttle control.

When this pin is grounded, the engine will respond to the remote throttle input. When this input is

not grounded, the engine will respond to the cab throttle pedal.

The PTO Enable input (VCU, 18/10) determines if the engine will be in VSG or ALSG mode.

If remote PTO is active and then disabled due to one or more disabling condition, PTO mode willautomatically reactivate when the disabling condition is removed.



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FEATURES

Installation

See Figure 5-22 for installation of a Remote Accelerator Control for PTO or ALSG.

Figure 5-22 Remote Accelerator Control for PTO or ALSG


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