Cab environment warning and control method and apparatus

Abstract

A method and apparatus for providing a cab pressure drop warning to an off-road machine operator and instructions for increasing the cab pressure and for providing incentive to correct the pressure drop, the method including comparing ambient and cab pressures and threshold pressure (i.e., the ambient plus a differential value), causing a vehicle operation disruption for at least a short period during which the operator may elect to remedy the cab pressure drop.

1 . An apparatus for protecting a vehicle operator within a cab of a mobile vehicle working in a polluted environment, the cab sealed from the polluted environment and including a pressure system for maintaining a cab pressure above a threshold pressure and a pressure sensor for generating an alarm signal when the cab pressure drops below the threshold pressure, the apparatus comprising: 
 a timer; and    a processor linked to the timer and for, when a first alarm signal is generated, disrupting operation of the vehicle, timing out a disrupt period and, at the end of the disrupt period, returning the vehicle to normal operation.    
     
     
         2 . The apparatus of  claim 1  wherein, during the disrupt period, the processor monitors the alarm signal and, if the alarm signal ceases, returns the vehicle to normal operation.  
     
     
         3 . The apparatus of  claim 2  further including a communication device for communicating information to a vehicle operator and a memory device for storing information related to possible causes of cab pressure reduction, the processor linked to the communication device and the memory device and, when an alarm signal is generated, retrieving the information and providing the information to the vehicle operator via the communication device.  
     
     
         4 . The apparatus of  claim 3  wherein the information also includes a message that vehicle operation will remain disrupted for the duration of one disrupt period unless the cab pressure rises above the threshold pressure.  
     
     
         5 . The apparatus of  claim 3  wherein the communication device is one of a visual display and an audio transmitter.  
     
     
         6 . The apparatus of  claim 3  wherein the information includes a list of instructions guiding the vehicle operator to perform various tasks to increase the cab pressure to a point above the threshold pressure.  
     
     
         7 . The apparatus of  claim 4  wherein the vehicle includes an implement and wherein the processor disrupts by disabling the implement.  
     
     
         8 . The apparatus of  claim 7  further including a marker system for marking field location and, wherein, the processor causes the marker system to mark location upon disabling the implement.  
     
     
         9 . The apparatus of  claim 1  further including an audible alarm and wherein the processor disrupts by activating the alarm.  
     
     
         10 . The apparatus of  claim 1  wherein the processor disrupts by reducing the maximum vehicle speed.  
     
     
         11 . The apparatus of  claim 1  wherein the vehicle includes an implement and wherein the processor disrupts by disabling the implement.  
     
     
         12 . The apparatus of  claim 1  further including a communication device for communicating information to a vehicle operator and a memory device for storing information related to possible causes of cab pressure reduction, the processor linked to the communication device and the memory device and, when an alarm signal is generated, the processor also retrieving the instructions and providing the instructions to the vehicle operator via the communication device.  
     
     
         13 . The apparatus of  claim 12  wherein the communication device is one of an audible device and a visual device.  
     
     
         14 . The apparatus of  claim 1  further including an indicator and, wherein, when the first alarm signal is generated, the processor activates the indicator and times out a delay period prior to disrupting vehicle operation.  
     
     
         15 . The apparatus of  claim 14  wherein the indicator is a communication device for communicating information to a vehicle operator and a memory device for storing information related to possible causes of cab pressure reduction, the processor linked to the communication device and the memory device and, when an alarm signal is generated, the processor activating the indicator by retrieving the instructions and providing the instructions to the vehicle operator via the communication device during the delay period and during the disrupt period.  
     
     
         16 . An apparatus for protecting a vehicle operator within a cab of a mobile vehicle working in a polluted environment, the cab sealed from the polluted environment and including a pressure system for maintaining a cab pressure above a threshold pressure and a pressure sensor for generating an alarm signal when the cab pressure drops below the threshold pressure, the apparatus comprising: 
 a communication device for communicating information to the vehicle operator;    a memory device for storing information related to possible causes of cab pressure reduction;    a processor linked to the communication device and the memory device and for, when an alarm signal is generated, retrieving the instructions and providing the instructions to the vehicle operator via the communication device.    
     
     
         17 . The method of  claim 16  wherein the information includes a list of instructions guiding the cab operator to perform various tasks to increase the cab pressure to a point above the threshold pressure.  
     
     
         18 . A method for protecting a vehicle operator within a cab of a mobile vehicle working in a polluted environment, the cab sealed from the polluted environment and including a pressure system for maintaining a cab pressure above a threshold pressure and a pressure sensor for generating an alarm signal when the cab pressure drops below the threshold pressure, the method comprising the steps of: 
 monitoring the alarm signal; and    when an alarm signal is generated, 
 starting a timer to time out a disrupt period;  
 disrupting vehicle operation during the disrupt period; and  
 at the end of the disrupt period, normalizing vehicle operation.  
   
     
     
         19 . The method of  claim 18  wherein, during the disrupt period, the method further includes the steps of monitoring the alarm signal and, if the alarm signal ceases, normalizing vehicle operation.  
     
     
         20 . The method of  claim 19  further including the steps of providing a communication device for communicating information to a vehicle operator and, when an alarm signal is generated, also providing information related to possible causes of cab pressure reduction to the vehicle operator via the communication device.  
     
     
         21 . The method of  claim 20  wherein the step of providing a communication device includes providing one of a visual display and an audio transmitter.  
     
     
         22 . The method of  claim 18  wherein the vehicle includes an implement and wherein the step of disrupting includes disabling the implement.  
     
     
         23 . The method of  claim 22  wherein the vehicle further includes a marker system for marking field location and, wherein, the step of disabling further includes the step of causing the marker system to mark location upon disabling the implement.  
     
     
         24 . The method of  claim 18  wherein the step of disrupting includes activating an audible alarm.  
     
     
         25 . The method of  claim 18  further including the steps of providing an indicator and, wherein, when the first alarm signal is generated, activating the indicator and timing out a delay period prior to the step of disrupting.  
     
     
         26 . The method of  claim 25  wherein the step of providing an indicator includes the step of providing a communication device for communicating information to a vehicle operator and, when an alarm signal is generated, the step of activating the indicator includes providing information related to possible causes of cab pressure reduction to the vehicle operator via the communication device.  
     
     
         27 . An apparatus for protecting a vehicle operator within a cab of a mobile vehicle working in a polluted environment, the cab sealed from the polluted environment, the apparatus comprising: 
 a contaminant sensor for sensing presence of a contaminant in the cab and generating an alarm signal when the sensor senses the presence of a contaminant;    a timer; and    a processor linked to the timer and for, when a first alarm signal is generated, disrupting operation of the vehicle, timing out a disrupt period and, at the end of the disrupt period, returning the vehicle to normal operation.    
     
     
         28 . The apparatus of  claim 27  wherein, during the disrupt period, the processor monitors the alarm signal and, if the alarm signal ceases, returns the vehicle to normal operation.  
     
     
         29 . The apparatus of  claim 27  wherein the vehicle includes an implement and wherein the processor disrupts by disabling the implement.  
     
     
         30 . The apparatus of  claim 27  wherein the processor disrupts by reducing the maximum vehicle speed.  
     
     
         31 . The apparatus of  claim 27  further including an indicator and, wherein, when the first alarm signal is generated, the processor activates the indicator and times out a delay period prior to disrupting vehicle operation.