DOOR AND RAMP INTERFACE SYSTEM
An access system for a vehicle includes an interface system that communicates with the vehicle data bus. The interface system also communicates with a ramp control subsystem that operates to stow and deploy a ramp for providing wheelchair access to the vehicle. A door control subsystem is coupled to the vehicle data bus and operates to open and close a vehicle door in response to data signals sent over the vehicle data bus. When the vehicle door is open and the ramp is deployed, the interface system is configured to send a ramp deployed data signal over the vehicle data bus, which prevents the door control subsystem from closing the door on the deployed ramp.
This application is a continuation of U.S. patent application Ser. No. 11/837,993, filed Aug. 13, 2007, which claims the benefit of and priority to U.S. Provisional Patent Application No. 60/822,666, filed Aug. 17, 2006. The entire content of each of these applications is hereby incorporated by reference.
BACKGROUNDAccess systems, such as motorized lifts, have been used to transport people and cargo. These access systems include platforms, ramps, moving seats, movable steps, and the like, which may be attached to stationary structures, such as buildings and loading docks, or mobile structures such as vehicles. Access systems have been used to provide disabled individuals access to structures that traditionally were accessible only via steps or stairs, or required an individual to step over or across an obstacle. For example, motorized lifts and ramps have been used to allow disabled individuals to enter and exit vehicles. In another example, motorized lifts have been used to load and/or unload stretchers from vehicles, such as ambulances. Motorized lifts have also been used on loading docks and trucks to allow cargo to be loaded, unloaded or otherwise moved.
When an access system is installed in a vehicle, such as a minivan, it is often integrated with an original equipment manufacturer (“OEM”) or after market system (collectively, “OEM system”) of the vehicle. The OEM system may often include an electronics package with a power sliding door subsystem, a part of most OEM electronics packages, that opens or closes the sliding door when it receives a signal to do so (a “door operation signal”). Other OEM subsystems such as a remote receiver, door control subsystem (“DCS”) and a body control subsystem (“BCS”) may also be involved in opening or closing the door. These electronic subsystems are interconnected through a vehicular data communications bus which enables the BCS, DCS, remote receiver and door switch to communicate with each other and to receive a door operation signal. Generally, the user may communicate a door operation signal to the power sliding door system by pulling on a door handle of the vehicle or pushing a button on a keyless entry device. If the door operation signal is produced by a remote device, the power sliding door system receives the door operation signal via the remote receiver. If the door operation signal is produced by movement of the door handle, the door operation signal causes the door switch to close, which communicates the door operation signal to the power sliding door system.
One example of a platform of vehicles into which access systems are installed is the Dodge Caravan/Chrysler Town & Country line of vehicles. These vehicles include an OEM data bus to which a number of OEM control modules are connected. The OEM control modules transmit status and command information over the OEM data bus to control the operation of a wide variety of vehicle systems including door locks, power sliding doors, anti-lock brakes, and the like. In certain cases, if a vehicle occupant activates a button, switch, or other input to request a particular action (e.g. opening a door), one or more of the OEM control modules sends a clearance request over the OEM data bus to determine whether or not the action should be performed. After the clearance request is initiated, the OEM control modules evaluate the status of a number of vehicle systems such as the transmission position, vehicle speed, and door lock position. If the OEM control modules determine that the status of each system is acceptable, the door control subsystem will be cleared to activate the motors and switches that unlatch and open the door. On the other hand, if it would not be appropriate to open the door (e.g. because the vehicle is in motion), at least one of the OEM control modules will send a signal over the OEM data bus that prevents the door control module from opening the door.
SUMMARYWhen access systems are installed in vehicles with a power sliding door system as described above, the access system must interface with the power sliding door system to coordinate operation of the access system (e.g. the access ramp or lift operation) with door operation by the power sliding door subsystem. Interference between the door and the ramp or lift (hereinafter collectively referenced as a “ramp”) generally only occurs when the ramp is not fully stowed. To prevent such interference, the access system may be installed so that it receives door operation commands from the OEM system. The access system may also communicate ramp status to the OEM system whenever the ramp is stowed or deployed.
To coordinate operation of the door and the ramp, the invention provides an access system for a vehicle having a door control system that opens and closes a vehicle door and that is coupled to a vehicle data bus. The access system includes a ramp control system having a ramp that is movable between a stowed position and a deployed position. The ramp provides access to the vehicle when the door is open and the ramp is deployed. The access system also includes an interface system that is coupled to and communicates with the ramp control system to initiate movement of the ramp between the stowed and deployed positions. The interface system also receives ramp status signals that indicate whether the ramp is stowed or deployed. A gateway module is coupled to the vehicle data bus for data communication with other vehicle systems and components that are coupled to the vehicle data bus. A gateway bus is coupled to and carries data signals between the gateway module and the interface system. To prevent operation of the door when the ramp is deployed, the interface system relays ramp status signals to the gateway module via the gateway bus, and the gateway module relays the ramp status signals to the door control system via the vehicle data bus. The door control system will not operate to close the door until it receives a data signal indicating that the ramp has been stowed.
The invention can be better understood with reference to the following drawings and description. The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention. In the figures, the same reference symbols designate the same parts, components, modules, subsystems or steps, unless and to the extent indicated otherwise.
Before any embodiments of the invention are explained in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the following drawings. The invention is capable of other embodiments and of being practiced or of being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting.
DETAILED DESCRIPTIONTo open and close the door of the vehicle, a user may activate the DCS 1330 by communicating an activation signal wirelessly from a remote unit 1322. For example, the user may communicate the activation signal via the remote unit's antenna 1324 to the antenna 1328 of a receiver 1326 on the vehicle. The receiver 1326 may communicate the activation signal with the DCS 1330 via the data bus 1320 and a body control subsystem “BCS” 1329. The remote unit 1322 may be implemented or included on a key fob. Alternately, the user may open and close the door by operating a handle on a door of the vehicle. Activating the door handle may trigger an indicator, such as a switch, indicating that the door is being operated (the “door operation indicator 1390”). In the illustrated embodiment, the door operation indicator 1390 produces and communicates an activation signal to the DCS 1330 via the BCS 1329 and the data bus 1320. The BCS 1329 controls communication of the activation signal from the remote receiver 1326 to the DCS 1330 when signals from other systems of the vehicle indicate that it is permissible to do so. For example, the BCS 1329 may communicate the activation signal to the DCS 1330 only when the vehicle is not moving and/or the engine of the vehicle is turned off.
A ramp control subsystem 1342 and the remainder of the access system deploy and stow a ramp to provide an alternative path for entering and exiting the vehicle. The ramp control subsystem 1342 and the remainder of the access system may be installed by a third party after the vehicle has been manufactured. In some cases the DCS 1330 includes a mechanism that will prevent operational interference between the door and the ramp. However, in other cases, additional signaling is necessary to ensure coordinated operation of the door and the ramp. As a result, the interface system 1300 may be installed in the vehicle with the access system 1360.
The interface system 1300 shown in
As shown in
To coordinate stowing and deploying of the ramp with operation of the door, the ramp control subsystem 1342 may be activated by the same activation signal that is carried on the data bus 1320 for activation of the DCS 1330. The activation signal can be communicated from the data bus 1320 to the interface system 1300 by way of the gateway module 1338 and the gateway bus 1340. It should be appreciated that the activation signal on the data bus 1320 can be initiated from a variety of sources, including the door operation indicator 1390, which may cause the BCS 1329 to send the activation signal over the data bus 1320, or from the remote receiver 1326, which may send its own activation signal directly over the data bus 1320. The interface system 1300 also receives door status signals that the DCS 1330 sends over the data bus 1320 when the door is opened or closed. For example, when the door reaches a fully open position a full open indicator 1391 sends a signal to the DCS 1330, which in turn sends a door fully open signal over the data bus 1320 to inform the other modules and subsystems connected to the data bus 1320 that the door is fully open. The interface system 1300 receives the door fully open and other door status signals by way of the gateway module 1338 and the gateway bus 1340. Thus, the interface system 1300 knows whether the door is opened or closed and, therefore, whether it is appropriate to deploy or stow the ramp. By communicating ramp status signals to the data bus 1320, and receiving activation and door status signals from the data bus 1320 via the gateway 1338 and gateway bus 1340, the interface system 1300 prevents operational interference between the door and the ramp.
The interface system 1300 is shown in more detail in
The ramp control interface module 1308 is generally the module through which the interface system 1300 communicates with the ramp control subsystem 1342. The ramp control subsystem 1342 generally controls the movement of the ramp, such as during stowage and deployment. The ramp control interface module 1308 coordinates the movement of the ramp with that of the door to prevent interference between the two. For example, the ramp control subsystem 1342 may be configured so that it will not initiate movement of the ramp without a signal from the interface system 1300. The interface system 1300 may only communicate a ramp operation signal when the door status module 1310 has received a door status signal indicating that the status of the door is opened. In addition, the ramp control interface module 1308 may be the module through which the ramp control subsystem 1342 communicates the status of the ramp with the interface system 1300. The ramp status module 1306 may communicate the ramp status, such as “deployed” or “stowed,” to the BCS 1329 or DCS 1330 via the gateway bus 1340, the gateway module 1338, and the data bus 1320. The door status module 1310 may receive door status signals sent over the data bus 1320 by the DCS 1330 via the gateway module 1338 and gateway bus 1340. The door operate command module 1307 may receive door activation signals sent from the gateway module 1338 over the gateway bus 1340. The door activation signals may have initially been sent to the gateway module 1338 by the remote device 1322 via the data bus 1320, or from the door operation indicator 1390 via the BCS 1329 and data bus 1320. Other devices not illustrated in
In the system illustrated in
In embodiments where the gateway module 138 is incapable of communicating “door open” and “door close” requests from the data bus 1320 to the interface system 100, the interface system 100 may be coupled to other vehicle components in order to determine if a request to open or close the door has been made. In this regard, the ramp control subsystem 142 may be activated by an activation signal not initiated from the data bus 1320 via the interface system 100. In general, the interface system 100 may determine whether an activation signal has been received by monitoring one or more systems of the vehicle other than the data bus 1320. For example, the interface system 100 may be in communication with a door operation indicator 132, such as a switch, and can thus receive activation signals without monitoring the data bus 1320. To determine whether an activation signal has been received from a remote device 122, the interface system 100, may monitor other systems (each an “activation indicator”) within the vehicle that are activated when the remote device 122 is activated. For example, if the vehicle is configured so that the tail lights flash when an activation signal is received, the interface system 100 may monitor, for example, the tail lights, horn and/or interior vehicle lights. When the interface system 100 detects that certain lights have flashed or the horn has sounded in a certain way, the interface system 100 may interpret those events as a request to open or close the door and deploy or stow the ramp.
In embodiments where the gateway module 138 is incapable of communicating “door open” and “door close” status signals from the data bus 1320 to the interface system 100, the interface system 100 may monitor one or more door status indicators 136 (only one door status indicator is illustrated in
In some embodiments, the gateway module 138 may be configured to communicate only “door open” and “door closed” status signals from the data bus 1320 to the interface system, while preventing communication of the “door open” and “door close” requests from the data bus to the interface system. In these embodiments, it may be unnecessary to couple the interface system 100 to one or more door status indicators 136 because the door status signals are instead communicated to the interface system from the data bus 1320 via the gateway module 138 and gateway bus 140 as discussed above with respect to the embodiment of
The interface system 100 is shown in more detail in
The ramp control interface subsystem 108 is generally the subsystem module through which the interface system 100 communicates with the ramp control subsystem 142. The ramp control subsystem 142 generally controls the movement of the ramp, such as during stowage and deployment. The ramp control interface module 108 coordinates the movement of the ramp with that of the door to prevent interference between the two. For example, the ramp control subsystem 142 may be configured so that it will not initiate movement of the ramp without a signal from the ramp control interface module 108 and the interface module 100 may only communicate this signal when the interface control module 100 has detected an activation indicator, and the door status indicator 136 communicates that the door is fully open. In addition, the ramp control interface module 108 may be the module by which the ramp control subsystem 142 communicates the status of the ramp with the interface system 100. The ramp status module 106 may communicate the ramp status, such as “deployed” or “stowed,” to the OEM system 150 via the gateway bus 140, gateway module 138 and the data bus 1320. The ramp control subsystem 108 and the interface system 100 may be implemented together or in separate modules as shown in
Another example of an interface system implemented in a vehicle is shown in
The interface system 700 of
Claims
1. An access system for a vehicle, the vehicle including a data bus, a door control system that opens and closes a vehicle door, and an activation signal source, the door control system and the activation signal source coupled to the data bus for communicating information via the data bus, the access system comprising:
- an interface system in communication with the data bus for communicating information via the data bus between the interface system and the activation signal source and the interface system and the door control system, the interface system operable to receive at least door activation signals sent on the data bus by the activation signal source and door status signals sent on the data bus by the door control system, the interface system operable to send a ramp status signal on the data bus;
- a ramp control system in communication with the interface system, the ramp control system including a ramp that is movable between a stowed position and a deployed position in response to ramp operation signals received from the interface system,
- wherein the interface system coordinates operation of the vehicle door and the ramp by sending a ramp deployed status signal on the data bus when the ramp is not in the stowed position, wherein sending a ramp deployed status signal on the data bus prevents the door control system from closing the door in response to a door activation request sent by the activation signal source when the ramp is not stowed, wherein the interface system responds to the door activation request by sending a stow ramp operation signal to the ramp control system, which responds by moving the ramp to the stowed position and sending a ramp stowed signal to the interface system, and wherein the interface system responds to the ramp stowed signal by changing the ramp status signal to thereby allow the door control system to close the door.
2. The access system of claim 1, wherein the interface system further coordinates operation of the vehicle door and the ramp when the ramp is in the stowed position by monitoring the data bus for the door activation request sent by the activation signal source, waiting for the door control system to send a door fully open door status signal on the data bus, and sending a deploy ramp operation signal to the ramp control system in response to the door fully open door status signal.
3. The access system of claim 1, further comprising a gateway module configured to relay communications between the data bus and the interface system.
4. The access system of claim 1, wherein the vehicle includes at least one activation indicator that operates in response to a request to open or close the door, and wherein the interface system is coupled to the activation indicator to detect operation thereof in response to a request to open or close the door.
5. The access system of claim 1, further comprising at least one door operation indicator that initiates a request to open or close the door, and wherein the interface system is coupled to the door operation indicator to determine when a request to open or close the door has been made.
6. The access system of claim 5, wherein the door operation indicator includes a manually-operable button that sends a ground signal to a body control subsystem of the vehicle, and wherein the interface system is coupled to the button to detect the ground signal.
7. The access system of claim 1, further comprising at least one door status indicator that detects when the door is fully open, and wherein the door status indicator is coupled to the interface system and sends a signal to the interface system to indicate that the door is fully open.
8. An access system for a vehicle, the vehicle including a door control system operable to control movement of a vehicle door, a body control subsystem, and a vehicle data bus coupling the door control system and the body control subsystem for data communication, the access system comprising:
- an interface system coupled to the vehicle data bus for data communication with the door control system and the body control subsystem via the vehicle data bus, the interface system operable to detect a door operation request data signal sent via the vehicle data bus from the body control subsystem to the door control system, operable to send ramp status data signals over the vehicle data bus, and operable to send ramp operation signals; and
- a ramp control system in communication with the interface system, the ramp control system operable to move a ramp between stowed and deployed positions in response to the ramp operation signals, and operable to communicate ramp status to the interface system, wherein when the door is closed and the ramp is stowed, the interface system responds to the door operation request data signal by monitoring for a door fully open signal, and in response to detecting the door fully open signal, the interface system sends a deploy ramp operation signal to the ramp control system, which responds by moving the ramp from the stowed position to the deployed position and by sending a deployed ramp status to the interface system when the ramp reaches the deployed position, and wherein the interface system sends a deployed ramp status data signal over the vehicle data bus in response to receiving the deployed ramp status from the ramp control system to thereby prevent the door control system from closing the door on the deployed ramp in response to additional door operation request data signals.
9. The system of claim 8, wherein the door fully open signal includes a door fully open data signal sent over the vehicle data bus by the door control system.
10. The system of claim 8, wherein the vehicle further includes a door operation indicator that sends a discrete electrical signal in response to an operator request for activation of the door, wherein the interface system is coupled to the door operation indicator to detect the discrete electrical signal, and wherein the interface system responds to the discrete electrical signal by moving the ramp from the stowed position to the deployed position.
11. An access system for a vehicle, the vehicle including a door control system operable to control movement of a vehicle door, a body control subsystem, and a vehicle data bus coupling the door control system and the body control subsystem for data communication, the access system comprising:
- an interface system coupled to the vehicle data bus for data communication with the door control system and the body control subsystem via the vehicle data bus, the interface system operable to detect a door operation request data signal sent via the vehicle data bus from the body control subsystem to the door control system, operable to send ramp status data signals over the vehicle data bus, and operable to send ramp operation signals;
- a ramp control system in communication with the interface system, the ramp control system operable to move a ramp between stowed and deployed positions in response to the ramp operation signals, and operable to communicate ramp status to the interface system, wherein when the door is open and the ramp is deployed, the interface system sends a deployed ramp status data signal over the vehicle data bus, wherein sending the deployed ramp status data signal over the vehicle data bus prevents the door control system from responding to the door operation request data signal, wherein the interface system responds to the door operation request data signal by sending a stow ramp operation signal to the ramp control system, which responds by moving the ramp from the deployed position to the stowed position and by sending a stowed ramp status to the interface system when the ramp reaches the stowed position, and wherein the interface system sends a stowed ramp status data signal over the vehicle data bus in response to receiving the stowed ramp status from the ramp control system to thereby allow the door control system to close the door.
12. The access system of claim 11, wherein the door control system automatically operates to close the door in response to the stowed ramp status data signal.
Type: Application
Filed: Jun 22, 2009
Publication Date: Oct 15, 2009
Inventors: Keith D. Heigl (Winamac, IN), Justin C. Gilmore (Monticello, IN), Andrew L. Henseleit (LaPorte, IN)
Application Number: 12/489,076
International Classification: G06F 19/00 (20060101);