Abstract:
An intelligent chassis mechanism incorporated into a vehicle includes a plurality of stress-strain sensors installed in the chassis of the vehicle at different locations for detecting the direction and amount of any strain occurred thereon to enable the chassis mechanism to be a large strain-detecting unit. The intelligent chassis mechanism can be combined with microprocessor artificial intelligent technology to detect how much strain the vehicle takes and to provide the detected data to the microcomputer system of the vehicle.

Description:
BACKGROUND OF THE INVENTION  
       [0001]     1. Field of the Invention  
         [0002]     The present invention relates to artificial intelligent technology and more particularly, to the application of a microcomputer technology to incorporate an intelligent chassis mechanism capable of detecting strain thereof into a vehicle.  
         [0003]     2. Description of the Related Art  
         [0004]     A vehicle is a well-developed public transportation means having more than one hundred years&#39; history. Following fast development of modern technology and civilization, different intelligent vehicles of different shapes and functions have been developed. These intelligent vehicles are the combination of mechanics and microcomputer technology. The chassis is the main structure of a vehicle that supports the whole vehicle system. Till the present time, there is no any breakthrough design of chassis been created.  
         [0005]     With respect to strain detection, U.S. Pat. No. 3,934,663, entitled “Attachment device for a gauge”, teaches the use of sensor means under the driver&#39;s seat to detect the driver&#39;s weight, or in a measuring means to measure the vehicle weight. This conventional technique does not take the chassis characteristics into account, therefore it is unable to fully carry out the detecting function of a stress or strain sensor or to make the vehicle intelligent.  
         [0006]     Therefore, it is desirable to provide an intelligent vehicle that combines artificial intelligent technology to give a quick response to any variation of stress and to detect the parameters of the vehicle, such as vehicle weight, tire pressure, impact, temperature, wheel alignment, and etc.  
       SUMMARY OF THE INVENTION  
       [0007]     The present invention has been accomplished under the circumstances in view. It is therefore the main object of the present invention to provide an inexpensive intelligent chassis mechanism, which combines microprocessor artificial intelligent technology to detect any force worked on the vehicle.  
         [0008]     It is another object of the present invention to provide an intelligent vehicle, which combines a microcomputer artificial intelligent technology to detect the direction and amount of any strain occurred on the vehicle for feedback of the detected result to the microcomputer system of the vehicle.  
         [0009]     To achieve these objects of the present invention, the intelligent chassis is incorporated into a vehicle, comprising a chassis body, and at least one stress-strain sensor. The chassis body comprises at least one wheel bracket, at least one wheel rotatably fastened to the at least one wheel bracket to bear the weight of the vehicle. The at least one stress-strain sensor is installed in the at least one wheel bracket for detecting the amount and direction of a strain occurred thereon so as to provide to the microcomputer system of the vehicle a respective strain data indicative of the amount and direction of the strain detected. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0010]      FIG. 1  is a schematic view of a four-wheel vehicle constructed according to a first preferred embodiment of the present invention.  
         [0011]      FIG. 2  is a schematic top view of  FIG. 1 .  
         [0012]      FIG. 3  is a circuit block diagram of the first preferred embodiment of the present invention.  
         [0013]      FIG. 4  is a schematic drawing showing the structure of the detecting circuit of the stress-strain sensor according to the first preferred embodiment of the present invention.  
         [0014]      FIG. 5  is a circuit block diagram of a second preferred embodiment of the present invention.  
         [0015]      FIG. 6  is a schematic drawing showing the structure of the detecting circuit of the stress-strain sensor according to the second preferred embodiment of the present invention. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0016]     Referring to  FIGS. 1 and 2 , an intelligent vehicle  1  in accordance with a first preferred embodiment of the present invention comprises a chassis  10 . The chassis  10  comprises four support frames  101 ,  102 ,  103  and  104 , four wheel brackets  201 ,  202 ,  203  and  204  respectively mounted on the support frames  101 ,  102 ,  103  and  104 , and four wheels  21 ,  22 ,  23  and  24  respectively rotatably supported on the wheel brackets  201 ,  202 ,  203  and  204 . Through the wheel brackets  201 ,  202 ,  203  and  204 , the wheels  21 ,  22 ,  23  and  24  support the total weight of the vehicle. Stress-strain sensors  11 ,  12 ,  13  and  14  are respectively installed in the support frames  101 ,  102 ,  103  and  104 , enabling the chassis  10  itself to work as a big scale strain detector. When the chassis  10  is in a stable condition to receive reactive force from the wheels  21 ,  22 ,  23  and  24 , the stress-strain sensors  11 ,  12 ,  13  and  14  rapidly respond to the amount of strain of this stable condition and transmit a respective strain data X 1 , X 2 , X 3  or X 4  to a microprocessor  30  through a wireless transmission method, as shown in  FIG. 3 .  
         [0017]     Referring to  FIG. 4 , the stress-strain sensor  11  comprises a detecting circuit  110 , which is a Wheatstone Bridge circuit comprised of first variable resistor formed of a strain meter  111 , a second variable resistor formed of a temperature compensation strain meter  112 , and two fixed resistors R 1  and R 2 . The temperature compensation strain meter  112  is installed in a detection base of same material as the chassis  10  so that the temperature compensation strain meter  112  can compensate for the amount of deformation caused by the surrounding temperature at the detecting circuit  110 . Therefore, the stress-strain sensor  11  is free from the influence of the surrounding temperature and can accurately detect the amount of deformation of the chassis  10  around the area at which it is located. The other stress-strain sensors  12 ,  13  and  14  are made in the same manner. Therefore the stress-strain sensors  11 - 14  each provide a respective strain data X 1 , X 2 , X 3  or X 4  corresponding to the respective location to the microprocessor  30  for further calculation and recording.  
         [0018]     When the vehicle is in a stable condition, the detecting points each provide a respective reference strain data X 1 , X 2 , X 3  or X 4 , i.e., the respective initial value. When the chassis  10  is in a different temperature condition and carrying a different load, the detecting points respectively provide another strain data X 1 ′, X 2 ′, X 3 ′ or X 4 ′. Upon receive of this set of stain data X 1 ′, X 2 ′, X 3 ′ and X 4 ′, the microprocessor  30  compares the data with the storage reference stain data X 1 , X 2 , X 3  and X 4 , and then calculate the difference so as to obtain the amount of deformation and to output the calculation result to a display monitor  40  for display, enabling the user to know the message.  
         [0019]     In an example of a particular model of vehicle, when the total weight of the vehicle is transmitted to the stress-strain sensors  11 ,  12 ,  13  and  14  through the support frames  101 ,  102 ,  103  and  104  of the chassis  10 , the stress-strain sensors  11 ,  12 ,  13  and  14  each provide a respective reference strain data X 1 , X 2 , X 3  or X 4  in response to the total weight of the vehicle for use as the respective initial value. When the total weight of the vehicle changed, the stress-strain sensors  11 ,  12 ,  13  and  14  each provide a respective different strain data X 1 ′, X 2 ′, X 3 ′ or X 4 ′ in response to this change. This amount of variation at each detecting point is recorded so as to form a set of standard weight-strain data for this vehicle model, and a table of weight-strain data is then built in the microprocessor  30 . Thus, an intelligent product is provided for use to indicate the weight of this vehicle model at whatever time.  
         [0020]     In an example of local variation of weight where the weight of the vehicle is not evenly distributed through the wheels  21 ,  22 ,  23  and  24  but biased against a specific detecting point, the amount of variation at such a specific location will be relatively greater during detection, and the other detecting points will show a respective strain mode of different proportion of amount of deformation. By means of this strain mode, the distributed of the increased weight is measured. Therefore, the chassis  10  can be used to measure the distribution of weight of the vehicle at different locations. A regular strain sensor has a directional limitation, i.e., the stress-strain sensors  11 ,  12 ,  13  and  14  can only accurately detect the amount of strain in a particular direction. In order to detect the amount of deformation in different directions accurately, it is suggested to install a number of stress-strain sensors at every detecting point in different directions. Therefore, three stress-strain sensors can be installed in each of the support frames  101 ,  102 ,  103  and  104  in X, Y and Z directions to form a Cartesian coordinate system, enhancing the accurate strain detection functioning of the chassis  10 .  
         [0021]     With respect to the variation of tire pressure, when the tire pressure is low, a variation of bearing angle at every wheel  21 ,  22 ,  23  or  24  relative to the respective support frame  101 ,  102 ,  103  or  104  will be measured by the respective stress-strain sensors  11 ,  12 ,  13  or  14 , therefore the vehicle  1  has the function of indicting the insufficient status of tire pressure.  
         [0022]     With respect to the wheel alignment function, when the wheels are not kept in balance, i.e., the wheels  21 ,  22 ,  23  and  24  are not well aligned, the two opposite lateral sides of the chassis  10  will be forced to produce a certain extent of deformation by the asymmetric force received from the support frames  101 ,  102 ,  103  and  104 , therefore another type of strain mode will be produced at every detecting point. By means of the multi-point detection of the stress-strain sensors  11 ,  12 ,  13  and  14 , the wheel alignment status of the chassis  10  is detected.  
         [0023]     With respect to impact detection, when one side of the body of the vehicle is slowly pressed by an external force to show a status similar to increase of local vehicle weight, however due to the existence of sideway component of force of vehicle weight, the strain mode produced by each of the stress-strain sensors  11 ,  12 ,  13  and  14  will be different from the strain mode produced by the stress-strain sensor due to increase of vehicle weight, therefore a stain mode of oppression at a particular point is detected. If the impact is a transient pressure to the vehicle, it can easily be detected. When encountered a road impact during running of the vehicle on the road, a transient variation of impact force will be produced, at this time the wheel(s) suspending in the air will provide a pull force to the chassis  10 , thereby causing a specific strain mode to be produced for recognition of the occurrence of the road impact.  
         [0024]     With respect to temperature compensation function, the invention provides a second embodiment. The intelligent vehicle  2  according to this second embodiment as shown in  FIG. 5 , is substantially similar to the aforesaid first embodiment. The chassis  10  of the intelligent vehicle  2  comprises stress-strain sensors  51 ,  52 ,  53  and  54  respectively mounted on the support frames  101 ,  102 ,  103  and  104 , and a temperature-strain meter  55  that produces a strain mode subject to the variation of surrounding temperature. According to this embodiment, the stress-strain sensors  51 ,  52 ,  53  and  54  do not provide a temperature compensation function.  FIG. 6  shows the structure of the detecting circuit  510  of one stress-strain sensor  51 . The detecting circuit  510  is a Wheatstone bridge circuit comprised of a strain meter  511  formed of a variable resistor, and three fixed resistors R 1 , R 2  and R 3 . The detection circuit  510  responds to the amount of deformation under the current temperature. The other three sets of stress-strain sensors  52 ,  53  and  54  have the same structure. Therefore, the stress-strain sensors  51 - 54  produce respective strain data X 1 ″, X 2 ″, X 3 ″and X 4 ″ containing an effect of temperature. The temperature-strain meter  55  is adapted to detect the amount of deformation produced at the vehicle due to the change of surrounding temperature, thereby producing a strain data X 5 ″ for temperature compensation, therefore, when compared with the reference data built in the microprocessor  30 , the stress-strain sensors  51 ,  52 ,  53  and  54  accurately respond to the influence of the variation of temperature at the respective detecting point to the chassis  10 , and the variation value of the chassis affected by the surrounding temperature is measured.  
         [0025]     Therefore, the user can know the variation of total weight of the vehicle, the variation of weight at a specific location in a specific direction, the variation of tire pressure of one specific wheel, the condition of an oppression (for example, impact) at one side of the vehicle, an unbalanced status of the wheels, or the variation of outside temperature at whatever time. Therefore, an intelligent vehicle made according to the present invention can detect various conditions and send the detected data to a microprocessor for processing, enabling the calculated result to be displayed on a display monitor, i.e., the invention enables a vehicle to become an intelligent machine.  
         [0026]     The aforesaid strain meter  111  can be a piezo meter formed of a piezoelectric crystal that achieves the same stress and strain detection function. Further, a wired communication line may be installed and electrically connected between the stress-strains sensors and the microprocessor  30  to substitute for the aforesaid wireless communication method. Further, the invention is applicable to any of a variety of vehicles that carries a microprocessor.  
         [0027]     Although particular embodiments of the invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.