SYSTEM AND METHOD FOR EMULATING VEHICLE IGNITION-SWITCHED POWER
First Claim
1. A power supply, comprising:
- a vehicle interface configured for connection to a vehicle diagnostic port, said port configured to provide access to vehicle network to which at least one vehicle device is connected; and
a controller configured to communicate through said diagnostic port to obtain an engine speed parameter and a vehicle speed parameter, said controller being further configured to generate an enable control signal indicative of a vehicle ignition-on state based on at least said engine speed and vehicle speed parameters.
1 Assignment
0 Petitions
Accused Products
Abstract
A power supply configured to emulate the functionality of ignition-switched power in a vehicle is configured to plug into an on-board diagnostics port (OBD-II) in the vehicle. The power supply includes a controller that is configured to determine the operating protocol to use and then communicates queries based on the determined protocol to obtain the current values for the engine speed and vehicle speed. The controller compares the current values against predetermined thresholds to determine whether the vehicle operating state is in an ignition-on state. When in the ignition-on state, the controller asserts an enable control signal, which is provided to a switch that responds by switching the un-switched vehicle battery from the OBD-II port to an output interface of the power supply. When the controller determines that the vehicle is no longer in an ignition-on state, the controller de-asserts the enable control signal, thereby removing the power from the output interface.
-
Citations
13 Claims
-
1. A power supply, comprising:
-
a vehicle interface configured for connection to a vehicle diagnostic port, said port configured to provide access to vehicle network to which at least one vehicle device is connected; and a controller configured to communicate through said diagnostic port to obtain an engine speed parameter and a vehicle speed parameter, said controller being further configured to generate an enable control signal indicative of a vehicle ignition-on state based on at least said engine speed and vehicle speed parameters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A method of operating a power supply having a vehicle interface and an output interface, said vehicle interface being configured for connection to a vehicle diagnostic port wherein the port provides access to a vehicle network to which at least one vehicle device is connected, said method comprising the steps of:
-
(A) monitoring a level of a power signal on said port; (B) determining an operating protocol of the vehicle network; (C) communicating messages in accordance with said determined operating protocol through the diagnostic port to obtain current values for engine speed and vehicle speed parameters; and (D) asserting an enable control signal indicative of an ignition-on state of the vehicle based on the current values for engine speed and vehicle speed and when the power signal level exceeds a predetermined minimum threshold. - View Dependent Claims (10, 11, 12, 13)
-
Specification