Abstract:
An uninterruptible power supply (UPS) mountable within a vehicle receives input power and produces a first output in response to the received input power even in the absence of the input power. A detector is coupled to the UPS and detects a situation parameter associated with the vehicle and/or the UPS. The detected situation parameter is either an incline angle relative to a reference plane, an applied force, an acceleration or a vibration. The first output of the UPS is then modified as a function of the detected situation parameter with respect to either a threshold value or a range of values.

Description:
RELATED APPLICATIONS 
     This application is a non-provisional application claiming priority from U.S. Provisional Patent Application Ser. No. 61/298,321 for “Method and System for Modifying Operation According to Detected Orientation,” filed Jan. 26, 2010, and which is incorporated by reference herein for all purposes. 
    
    
     STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT 
     N/A 
     BACKGROUND OF THE INVENTION 
     Many systems in operation today, especially mobile systems such as automobiles, buses, trucks, planes, trains, etc., are susceptible to disruptions of their normal operating orientation. These disruptions may be due to changes in conditions, e.g., weather, icy roads, wind, etc., in the case of cars and trucks or collisions with other vehicles due to operator error, weather conditions or intentional malevolent actions. As a result of these changes in orientation, for example, a vehicle being knocked on its side, it may become necessary to alter some aspect of operation of the vehicle or system incorporated in the vehicle in response to the abnormal orientation condition. The altered operation may be necessary in order to protect either the occupants or others from danger. 
     Thus, for example, a vehicle using a power supply or an uninterruptible power supply as part of its operation may need the power supply to shut off if the vehicle were to roll over or, otherwise end up in a dangerous and/or nonoperational orientation. One can understand that a vehicle lying on its side, with a normally operating generator within, could present a dangerous situation to the occupants or to any rescue personnel who arrive on the scene. 
     What is needed, therefore, is a system that will be able to modify one or more aspects of the operation of a vehicle system in response to the detection of a specific orientation or an abnormal acceleration, for example, due to a shock or force. 
     BRIEF SUMMARY OF THE INVENTION 
     In one embodiment of the present invention, a system for mounting within a vehicle includes an uninterruptible power supply (UPS) that receives input power and produces a first output in response to the received input power even in the absence of the input power. A detector is coupled to the UPS and/or the vehicle and detects at least one situation parameter associated with at least one of the vehicle and the UPS. The detected situation parameter is either an incline angle relative to a reference plane, an applied force, an acceleration or a vibration. The first output of the UPS is then modified as a function of the detected situation parameter. 
     The modification of the first output of the UPS is determined by a relationship between the detected situation parameter and a parameter threshold value and/or a range of parameter threshold values. 
    
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
       Various aspects of at least one embodiment of the present invention are discussed below with reference to the accompanying figures. In the figures, which are not intended to be drawn to scale, each identical or nearly identical component that is illustrated in the various figures is represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. The figures are provided for the purposes of illustration and explanation and are not intended as a definition of the limits of the invention. 
         FIG. 1  is a block diagram of one embodiment of the present invention; In the figures: 
         FIG. 2  is a block diagram of an orientation sensing system in accordance with one embodiment of the present invention; 
         FIG. 3  is an uninterruptible power supply in accordance with one embodiment of the present invention; and 
         FIG. 4  is a method in accordance with one embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     U.S. Provisional Patent Application Ser. No. 61/298,321 for “Method and System for Modifying Operation According to Detected Orientation,” filed Jan. 26, 2010, is incorporated by reference herein for all purposes. 
     In accordance with one embodiment of the present invention, the power output from a power supply or uninterruptible power source may be either shut down completely or the power output reduced when the orientation, or tilt, of the device is detected as being out of an expected range of operation or when an excessive shock and/or vibrational forces have been detected. It has been noted that mobile applications, i.e., systems that are expected to be moving during normal operation, are susceptible to dangerous operating conditions when the orientation of a normally operating system is altered or the vehicle is subject to shock or vibration. 
     It should be noted that the concepts and embodiments to be described herein are readily applicable to many types of power systems including, but not limited to, uninterruptible power supplies, generators, batteries, solar generators, wind generators and capacitors. Further, while a mobile system, for example, a truck or vehicle, may be described, one of ordinary skill will understand that the concepts herein are equally applicable to other types of vehicles such as ships, trains, planes, tracked vehicles or construction equipment. Embodiments of the present invention are applicable where a significant roll, inversion, vibration or shock, i.e., a situation parameter, might present a dangerous situation to occupants, power sources, bystanders, or others. Still further, systems located on “stationary” equipment may also benefit from application of the teachings herein. 
     Referring now to  FIG. 1 , a system  100 , e.g., a vehicle such as a truck, includes a sensing module  102  coupled to an uninterruptible power supply (UPS)  104 . Generally, a UPS functions to provide better regulated, i.e., “cleaner,” power than that which might be provided directly from the output of a generator and will continue to provide power to a load for a limited period of time from a secondary power source even when the primary power input to the UPS becomes inactive. Those systems that need precise voltages, with “clean” characteristics, usually use a UPS. The sensing module  102  monitors the orientation of the UPS  104  and/or the vehicle  100  and the forces or shocks experienced by the vehicle  100  and/or the UPS  104  and, as will be discussed in more detail below, alters the operation of the UPS  104  in accordance with the detected orientation and forces. 
     In one embodiment of the present invention, the sensing module  102  includes a three axis sensing device  202  coupled to a control circuit  204 , as shown in  FIG. 2 . The sensing device  202  may be a small, low-power three axis accelerometer such as the ADXL335 device available from Analog Devices of Norwood, Mass. The sensing device  202  measures the static acceleration of gravity to provide tilt-sensing as well as the detection of dynamic acceleration resulting from motion, shock, vibration, etc. One of ordinary skill will understand that there are other type of devices that measure tilt angle or acceleration. These include, but are not limited to, a mercury switch, a piezoelectric device, a laser device, an acoustic device and a gyroscope, either laser-based or mechanical. 
     The control circuit  204  receives the output signals from the sensing device  202  and processes these signals to provide a CONTROL signal to, for example, the UPS  104 . In addition, the control circuit  204  receives a DISABLE signal that can be used to shut down the operation of the control circuit  204  such that operation of the system will continue irrespective of a change in orientation. An OVER-RIDE signal may also be provided to the control circuit  204  in order to “force” a change in operation although there may not be a change in orientation. 
     The control circuit  204  may also be able to set particular parameters, e.g., maximum tilt angles, forces, times, etc., as thresholds for determining when the detected orientation or force requires a change in operating status. 
     In one embodiment of the present invention, an uninterruptible power supply (UPS) is provided in a vehicle. The UPS is provided with circuitry to monitor the orientation of, and forces on, a vehicle and/or the UPS itself, e.g., the UPS&#39;s orientation separate from the orientation of the vehicle, such that the power output can be either modified or eliminated depending upon the detected orientation condition. 
     The UPS may be ruggedized in that it is built to withstand the conditions found in harsh environments, e.g., extreme heat, extreme cold, humidity, dust, rain, etc. The UPS may be built in compliance with a U.S. Military specification such as MIL-STD-810 or any other government or commercial standard of ruggedness. 
     It should be noted that the sensing module  102  need not be external to the UPS  104  and could be incorporated into the UPS  104 . As shown in  FIG. 3 , an uninterruptible power supply  300  is shown in which an orientation detection function, i.e., “ROLL OVER POWER SHUT OFF,” is provided. A switch  302  is used to enable or disable the rollover detection functionality. While the switch  302  is shown directly on the UPS  300 , it is understood that the switch  302  and any other visual indicators could be mounted in a location visible to a user and not directly on the UPS  300  itself. This would allow for positioning of the UPS  300  where necessary and provide for ease of access to the controls. Of course, the connection from the remotely mounted switch and indicators may need to be ruggedized in order to provide proper operation under the expected worst-case conditions. 
     Referring now to  FIG. 4 , a method  400  in accordance with one embodiment of the present invention begins at Step  402  with the setting of thresholds, angles, time periods, etc., that define the desired orientation or, alternatively, define the undesired orientation, and force parameters, i.e., the “set-points,” being entered into the system. Subsequently, Step  404 , the accelerations and/or tilt angle in the three axes is measured. At step  406 , it is determined whether or not the measured accelerations or tilt angles are within the operating specifications. If so, control returns to Step  404 , otherwise control passes, in one embodiment, to Step  408  where the power is shut down or an alternate mode of operation is initiated. This alternate mode of operation may involve operating at less than full output power or operating in a mode that is a function of the present orientation or force condition. 
     In an alternate mode of operation, subsequent to the determination in Step  406  that the accelerations or tilt angles are indicative of a changed orientation or force condition, the measurements may be analyzed in Step  412  to better determine the present operating condition. In response to the analyzed measurements of Step  412 , an alternate mode of operation based on this analysis may be initiated in Step  414  such as, for example, operating at less than full power for a predetermined time and then reevaluating the present operating condition to determine whether further changes are needed. 
     In one embodiment of the present invention, the control circuit  204  may include circuitry to filter out spurious shocks and vibrations in order to minimize the occurrence of “false” reports of altered orientation or excessive shocks. Further, the system may be provided with the capability to determine that an angle of operation, or tilt angle, has been detected for a predetermined period of time that might indicate a continuing operating condition and, therefore, necessitate a change in operating status, i.e., either a modification of operation or a shutting down of, for example, the power supply. 
     Still further, while embodiments of the present invention, as described above, include modifying the operating status or parameters of an uninterruptible power supply, the detection of a dangerous orientation as a result of an external force or shock could also result in a change in operation of a device other than the uninterruptible power supply described above. In one non-limiting example, the detected orientation may cause the cessation of one type of transmitted signal and the initiation of a transmission of a second type of transmitted signal. 
     In an alternate embodiment of the present invention, once a change in orientation has caused a modification of the operation of, for example, the UPS, a return to “normal” orientation may result in a return to “normal” operation. Thus, the detection of the orientation may continue even if the output of the UPS has been shut down or if the UPS has been turned off. In some instances, this may require a RESET signal being applied to the UPS, if the UPS was shut down, or it may require that control signals be directed to the UPS instructing the UPS to return to normal operation. 
     In yet another embodiment, the device being controlled may have multiple portions or functions, only some of which are to be altered in response to a detected orientation or shock. Thus, for example, in a situation where a UPS has multiple outputs, only one output connected to a particular device may be altered, or shut off completely, in response to the detection of a shock, force or orientation event. Thus, other portions of the UPS may continue to operate. Still further, some of the other outputs may be altered or shut down depending upon the devices that are connected. 
     For those UPS systems with separate outputs, each may have its own respective set of parameters to which a response is defined. Thus, in the example of a UPS with multiple outputs, an orientation of the UPS at a first tilt angle, or in response to a force of a first value, may only affect one output and not another. Further, there may be an Over-ride or Enable function separately provided for each output. 
     In addition, a user may be provided with an opportunity to delay or prevent either a shutting down or a change in operating status due to a detected tilt angle or shock event. In one non-limiting example, a UPS within a vehicle may be provided with the tilt angle and/or shock detection system described herein. A panel display visible to an occupant of the vehicle, either the driver or co-pilot, including an indicator, e.g., either a touch-screen interface or a set of lights and switches, is provided. When the UPS is about to change its status in response to an event, the user may be given the opportunity to either, for example, ignore the notification and let the change occur, operate the interface or switch to prevent the change, cause the change to be implemented immediately if there is a delay built in, or alter the operation of the system in some other manner. 
     The control circuit  204  may be implemented using discrete components in order to process the input signals from the sensing device  202  and the conditions of the input controls. Alternatively, the control circuit  204  may include a microprocessor and associated devices, for example, memory, input/output devices, etc., to process the output from the sensing device  202 , as well as the input controls, in order to determine the necessary response to the changed orientation. The control circuit  204  may be powered from a source separate from the UPS and the vehicle and may have, for example, battery backup capabilities. 
     Still further, embodiments of the present invention may include both a microprocessor-based system as well as a discrete device-based system. Such a “dual” system may provide redundancy when it is considered that the orientation system may need to continue to operate and control the UPS, or such other device or devices, upon occurrence of a shock, or tilt angle, that exceeds the expected operating conditions. 
     Having thus described several features of at least one embodiment of the present invention, it is to be appreciated that various other alterations, modifications, and improvements will readily occur to those skilled in the art. Such alterations, modifications, and improvements are intended to be part of this disclosure and are intended to be within the scope of the invention. Accordingly, the foregoing description and drawings are by way of example only, and the scope of the invention should be determined from proper construction of the appended claims, and their equivalents.