Patent Application
20080278302
The invention relates to an electric vehicle, particularly to a powerchair, scooter or like electric vehicle. The invention also relates to a display device for electric vehicle, and in particular to the display of current and maximum allowable vehicle speed. The invention also relates to methods for the display of vehicle speed information.
The speed of powerchairs, scooters and the like is typically controlled by a “speed pot” (a potentiometer controlled by a knob), a joystick or up/down buttons. Where a “speed pot” is employed the current speed of the electric may be indicated by the position of the knob.
Speedometers are sometimes employed but they are expensive as they require components to make actual speed measurements. Where employed they are generally implemented as numerical displays, typically LCD displays, displaying absolute speed.
Some electric vehicles adjust the maximum allowable speed in dependence upon the mode of operation of the electric vehicle. If a seat of the vehicle is raised the maximum allowable speed may be reduced. Likewise, the maximum allowable speed may be adjusted according to user profile information (i.e. functionality appropriate to the capacity of the user) or operating conditions (i.e. indoor/outdoor use).
When the mode of operation changes the user receives no indication that the maximum allowable speed is changing or what the maximum allowable speed in that mode is. To a user absolute speed information is generally of less importance than an indication of current speed in the context of maximum allowable speed and maximum allowable speed (i.e. what is the maximum allowable speed and how fast am I going compared to the maximum allowable speed?).
It is an object of the present invention to provide an electric vehicle, a display device for electric vehicle and a method of displaying information that effectively communicates the maximum allowable speed and/or the speed of the vehicle relative to the maximum allowable speed or to at least provide the public with useful choice.
According to a first aspect of the invention there is provided an electric vehicle including: a user input device;
one or more drive motor for driving one or more wheel of the vehicle;
a controller for providing drive signals to the one or more drive motor in response to user input via the user input device, wherein the controller is operable in a plurality of modes allowing different maximum operating speeds; and
a plurality of display elements driven by the controller to indicate vehicle speed, wherein vehicle speed is indicated by activating a proportion of display elements corresponding to the ratio of the actual speed of the vehicle to a maximum allowable speed for the mode of operation.
According to further aspect of the invention there is provided an electric vehicle including:
a user input device;
one or more drive motor for driving one or more wheel of the vehicle;
a controller for providing drive signals to the one or more drive motors in response to user input is via the user input device, wherein the controller is operable in a plurality of modes allowing different maximum operating speeds; and
a plurality of display elements driven by the controller to indicate vehicle speed, wherein an indication of the maximum allowable speed for the selected mode of operation is indicated by one or more display element.
According to another aspect of the invention there is provided an electric vehicle including:
a user input device;
one or more drive motor for driving one or more wheel of the vehicle;
a controller for providing drive signals to the one or more drive motors in response to user input via the user input device; and
a speed display device which indicates the speed of the electric vehicle in response to signals from the controller, wherein the controller determines the estimated speed of the electric vehicle based upon user input.
According to further aspect of the invention there is provided a display device for an electric vehicle capable of operating in a number of modes having different maximum operating speeds wherein the display device includes a number of display elements which display the speed of the vehicle by actuating a proportion of the display elements corresponding to the ratio of the speed of the vehicle to a maximum allowable speed for the mode of operation.
According to another aspect of the invention there is provided a display device for an electric vehicle capable of operating in a number of modes having different maximum allowable speeds wherein the display device includes one or more display element which displays the maximum allowable speed of the vehicle for the selected mode of operation.
According to further aspect of the invention there is provided a display device for an electric vehicle capable of operating in a number of modes having different maximum allowable speeds wherein the display device includes one or more display element which displays the maximum allowable speed of the vehicle for the selected mode of operation.
According to another aspect of the invention there is provided a method of displaying the speed of an electric vehicle capable of operating in a plurality of modes allowing different allowable speeds, comprising displaying the speed of the vehicle by actuating a proportion of display elements corresponding to the proportion of a current speed value of the vehicle to a maximum speed value of the vehicle for a given mode of operation.
According to further aspect of the invention there is provided a method of displaying the maximum allowable speed of an electric vehicle capable of operating in a plurality of modes allowing different maximum operating speeds, comprising actuating one or more display elements corresponding to the maximum speed value of the vehicle for a given mode of operation.
According to a still further aspect of the invention there is provided a method of displaying the speed of an electric vehicle capable of operating in a number of modes allowing different maximum operating speeds by displaying that a maximum speed value for a selected mode of operation has been attained by actuating all display elements of a vehicle speed display.
The invention will now be described by way of example with reference to the accompanying drawings in which:
The invention may be implemented in a variety of electric vehicles such as powerchairs, scooters etc. The general operation of such an electric vehicle is well-known.
User interface module 4 includes up/down buttons 8, 9. In response to actuation of buttons 8 and 9 controller 2 applies drive signals to motor 6 to raise and lower the seat of the vehicle.
Data may be communicated to controller 2 via interface port 7. This enables user profile information and the like to be communicated to controller 2 so that it operates within parameters appropriate to the user profile.
Display device 5 indicates the current speed and/or maximum allowable speed in a manner that is more fully illustrated in the following drawings.
The electric vehicle is capable of operating in a number of modes. The mode may be determined by user profile information supplied to the controller. Alternatively, the mode may be determined based upon the configuration of the electric vehicle, such as seat height. If the height of the seat of the vehicle is adjusted the maximum allowable speed is preferably limited accordingly.
Controller 2 determines the appropriate output to wheel drive motor 6 based on user input via joystick 1. According to one embodiment controller 2 generates output signals to drive display device 5 based on its calculation of current vehicle speed in accordance with user input, and not based on any actual measurement of vehicle speed. The current vehicle speed may be calculated according to one or more algorithm or based on data estimating current speed utilising historical speed and user input information. According to another embodiment controller 2 monitors a parameter of drive motor 6, such as terminal voltage, and determines vehicle speed based on this.
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A further method for displaying current vehicle speed in relation to the maximum allowable vehicle speed is to effectively rescale the display when the mode of operation changes. Thus, with reference to
One or more display element may flash during a change in mode to indicate to a user that a change in mode has occurred. Sometimes vehicles are deliberately programmed so that the maximum allowable vehicle speed is less than the maximum possible vehicle speed. Accordingly, in another method the display may be rescaled to represent the maximum allowable vehicle speed as a proportion of the maximum possible vehicle speed.
There is thus provided a simple display which clearly communicates to a user the maximum allowable speed for any given mode of operation. The user also knows their current speed in relation to the maximum allowable speed. Further, the calculation of current speed based on user input information greatly simplifies the provision of useful speed information to a user and reduces cost.
While the present invention has been illustrated by the description of the embodiments thereof, and while the embodiments have been described in detail, it is not the intention of the Applicant to restrict or in any way limit the scope of the appended claims to such detail. Additional advantages and modifications will readily appear to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details, representative apparatus and method, and illustrative examples shown and described. Accordingly, departures may be made from such details without departure from the spirit or scope of the Applicant's general inventive concept.
| Number | Date | Country | Kind |
|---|---|---|---|
| 533770 | Jun 2004 | NZ | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/NZ2005/000138 | 6/23/2005 | WO | 00 | 3/3/2008 |
