Automated vehicle battery protection with programmable load shedding and engine speed control
First Claim
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1. A motor vehicle comprising:
- an engine installed on the motor vehicle as its prime mover;
a power take off application installed on the vehicle drawing mechanical energization directly or indirectly from the engine;
first and second a controller area networks including a power train controller area network and body controller area network;
a plurality of vocational controllers including an engine controller connected to first controller area network for the exchange of data and an electrical system controller connected to the first and to the second controller area networks, the vocational controllers each having at least one vehicle subsystem associated therewith and the plurality of vocational controllers providing messages over the first or second controller area networks relating to motor vehicle conditions;
a vocational controller for the power takeoff application, the vocational controller for the power takeoff a application being connected to the second controller area network and the Dower takeoff application being powered from the engine;
a vehicle battery connected to be charged by operation of the engine;
means for providing vehicle battery voltage measurements to at least a first of the plurality of vocational controllers;
a battery monitor program stored on the first vocational controller for execution, the battery monitor program being responsive upon execution to at least two battery voltage trip points, including a first voltage trip point to which the programmed vocational controller is responsive for directing the engine controller to increase engine speed to at least a first preselected level, and a second voltage trip point to which the programmed vocational controller is responsive for releasing the engine controller to return the engine to engine idle speed; and
a plurality of programmed interlocks initiated in response to one or more motor vehicle conditions reported by the vocational controllers for preventing changes in engine speed under the direction of the battery monitoring program including an interlock for preventing changes in engine speed responsive to battery charge state when operation of the power take off application is engaged.
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Abstract
Automated motor vehicle battery voltage protection is provided by setting voltage trip points for increasing engine speed and for shedding selected electrical loads. The system is effected by programming a vehicle body computer which communicates with, and exerts control over, various vehicle system controllers over one or more controller area networks. The body computer is programmed to monitor battery voltage and initiates an increase in engine speed first, and if that fails to restore a minimum battery voltage level, begins shedding loads in a predetermined order.
29 Citations
8 Claims
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1. A motor vehicle comprising:
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an engine installed on the motor vehicle as its prime mover; a power take off application installed on the vehicle drawing mechanical energization directly or indirectly from the engine; first and second a controller area networks including a power train controller area network and body controller area network; a plurality of vocational controllers including an engine controller connected to first controller area network for the exchange of data and an electrical system controller connected to the first and to the second controller area networks, the vocational controllers each having at least one vehicle subsystem associated therewith and the plurality of vocational controllers providing messages over the first or second controller area networks relating to motor vehicle conditions; a vocational controller for the power takeoff application, the vocational controller for the power takeoff a application being connected to the second controller area network and the Dower takeoff application being powered from the engine; a vehicle battery connected to be charged by operation of the engine; means for providing vehicle battery voltage measurements to at least a first of the plurality of vocational controllers; a battery monitor program stored on the first vocational controller for execution, the battery monitor program being responsive upon execution to at least two battery voltage trip points, including a first voltage trip point to which the programmed vocational controller is responsive for directing the engine controller to increase engine speed to at least a first preselected level, and a second voltage trip point to which the programmed vocational controller is responsive for releasing the engine controller to return the engine to engine idle speed; and a plurality of programmed interlocks initiated in response to one or more motor vehicle conditions reported by the vocational controllers for preventing changes in engine speed under the direction of the battery monitoring program including an interlock for preventing changes in engine speed responsive to battery charge state when operation of the power take off application is engaged. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification