IP Library › Granted Patent US 7,101,312
Granted Patent B2
US 7,101,312 · App. 10/831,765 · Granted Sep 5, 2006

Vehicular power take-off control

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Quick Facts
Patent No.
US 7,101,312
App. No.
10/831,765
Filed
Apr 23, 2004
Granted
Sep 5, 2006
Kind
B2
Examiner
LE, DAVID D
Art Unit
3681
USPC
477/111
Abstract

A vehicular powertrain includes a throttle controlled engine and a power take-off system for driving external loads. A power take-off control executed in a first processor seeks to have engine control authority in accordance with operator invoked switch states including an enable switch and set switches. Power take-off switch data is provided to a second processor to determine the power take-off system status and provide an integrity diagnosis of the power take-off system.

Claims (23)

1. Method for power take-off control integrity diagnosis in a vehicle including a throttle controlled engine and a plurality of power take-off control switches, comprising:

receiving power take-off engine control requests by a first processor in a dual processor controller adapted to establish throttle position in response to said requests;

providing power take-off control switch data to a second processor in said dual processor controller;

inferring validity and invalidity of said power take-off engine control requests from said power take-off control switch data with said second processor; and

allowing establishment of throttle position in response to said power take-off engine control requests that are inferred valid with said second processor and disallowing establishment of throttle position in response to said power take-off engine control requests that are inferred invalid with said second processor.

2. The method as claimed in claim 1 wherein inferring validity comprises monitoring said power take-off switch input data for predetermined switch sequencing.

3. The method as claimed in claim 1 wherein inferring validity comprises monitoring said power take-off switch input data for predetermined switch states and switch sequencing.

4. The method as claimed in claim 1 wherein validity of power take-off control is further inferred from at least one of engine power, brake application and vehicle speed data.

5. Method for controlling an engine in a vehicular powertrain including a power take-off to effect power take-off control in accordance with a plurality of power take-off switch settings comprising:

providing power take-off engine control commands from a power take-off control to an engine control in a first processing means, said engine control adapted to effect engine control functions in accordance with said power take-off engine control commands;

providing a predetermined first power take-off status signal from a power take-off operator interface to said power take-off control indicative of whether power take-off engine control is being requested at the operator interface;

providing operator interface data to a second processing means;

determining with the second processing means a second power take-off status signal from said operator interface data;

ignoring power take-off engine control commands where said first and second power take-off status signals do not indicate an equivalent status.

6. The method of claim 5 wherein said predetermined power take-off status signal is determined by a power take-off switch processing means that is not part of the first processing means.

7. The method of claim 5 wherein said predetermined power take-off status signal is determined by a power take-off switch processing means that is part of the first processing means.

8. Method for controlling an engine in a vehicular powertrain including a power take-off to effect power take-off control in accordance with a plurality of power take-off switch settings comprising:

providing a first processor means including a power take-off control and an engine control, said engine control adapted to receive power take-off engine control commands from said power take-off control and effect engine control functions in accordance with said power take-off engine control commands;

providing a predetermined first power take-off status signal to said power take-off control indicative of whether power take-off engine control is requested;

providing power take-off switch state data to a second processor means;

determining with the second processor means a second power take-off status signal indicative of whether power take-off engine control is requested from said power take-off switch state data;

providing said second power take-off status signal to said first processor means; and,

disallowing engine control in accordance with power take-off engine control commands where either of said first and second power take-off status signals indicates power take-off engine control is not requested.