Locking system for vehicles

Abstract

A locking system for vehicles is disclosed. After the engine is turned off, the vehicle in accordance with this invention checks whether it is in a garage with limited space. If it is, it leaves the doors unlocked. If it determines that it is not in a garage with limited space, it checks if the car key is inside the car after the driver exited the car. If it is, it sets off an alarm for the driver to retrieve the key. If the car key is not inside the car, it further checks if the key is in close proximity. When it no longer detects the key in its close proximity outside the car, it automatically locks the doors.

Claims

1. A vehicle comprising: a plurality of first sensors to detect a presence of a car key in close proximity; a second sensor to detect if the a driver side door has been opened and subsequently closed; an on-board computer to lock the vehicle automatically when the engine is turned off and said first sensors no longer detect the presence of the car key inside or outside the vehicle after said second sensor indicates that a driver has exited the vehicle.

2. The vehicle of claim 1 further comprising: a third sensor to detect an actuation signal from a garage door; said on-board computer to record the odometer reading of the vehicle as Data A in its memory when said third sensor detects that the garage door has been actuated; said on-board computer to compute the value difference between said Data A and the odometer reading of the vehicle at the moment the engine is turned off; said on-board computer to decide to leave the doors unlocked after the engine is turned off if the value of said Data A is not zero and said value difference is very small number such as less than two meters, or to automatically lock the doors of the vehicle after it is determined by said first and second sensors that the key and the driver are no longer inside the vehicle and the value of said Data A is zero, or said value difference is greater than the distance the vehicle would have traveled in a garage with limited space.

3. The vehicle of claim 2 further comprising: said on-board computer to set off an alarm when said first sensors indicates that the key is inside the vehicle after the engine is turned off, and said second sensor indicates that the driver exited the vehicle.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a perspective view of a vehicle in accordance with the present invention.

(2) FIG. 2 is a flow diagram that shows what happens when a garage door opener has been actuated.

(3) FIG. 3 is a flow diagram that shows what happens after the engine is turned off.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

(4) A vehicle in accordance with the present invention is shown in FIG. 1 with a general reference number 10. A sensor 12 is installed anywhere in the vehicle to detect the signal from a garage door opener (not shown) being actuated.

(5) When the garage door opener is actuated, the sensor 12 detects its radio signal and prompts, as FIG. 2 shows, the on-board computer 16 (not shown) to record the vehicle's odometer reading at that moment in its memory as Data A. Each time a garage door opener is actuated regardless whether the vehicle is entering or exiting the garage, the new odometer reading will replace the value of the preceding Data A.

(6) As FIG. 3 shows, when the driver turns off the engine, the on-board computer 16 checks if the value of Data A is zero. If it is, that means the owner does not have a garage and the vehicle will be left unattended where it is accessible to general public.

(7) If the value of Data A is greater than zero, it means that the driver uses a garage. Then the on-board computer 16 further computes the value difference between Data A and the odometer reading at the moment the engine was turned off. The value of this difference is the distance the vehicle has traveled between the time when the engine was turned off and the time the garage door was closed. If the difference is zero, or a very small number such as less than 2 meters, it means the engine was turned off in a private garage with limited space. In this case, the on-board computer 16 decides to leave the car doors unlocked so that the driver or the driver's family member can easily get access to the inside of the vehicle without the key. Since the driver may turn off the engine before or after the driver closes the garage door, only the absolute value of the difference has meaning.

(8) If the difference is quite a large number, that means the vehicle has been driven inside a large gated garage such as in a condominium building, or it has been driven outside of any garage and to be left unattended on the street. In this case, the on-board computer 16, as shown in FIG. 3, checks if the driver side car door has been opened and closed using the conventional door sensor 14 (not shown), to decide if the driver exited the vehicle. When the on-board computer 16 detects that the driver side door has been opened and subsequently closed, it further checks if it detects the car key inside the vehicle using the signals from multiple key sensors 18 (not shown). If it does, it sets off an alarm so that the driver can retrieve the key.

(9) When both the driver and the key are outside the vehicle and the driver walks away from the vehicle with the key, the on-board computer 16 soon will lose the signal from the car key and the on-board computer 16 is prompted to lock the vehicle automatically.

(10) If the value of Data A is zero, it means the driver does not use garage and the vehicle will be left unattended in an open area or street. In this case, the on-board computer 16 directs the doors to be locked automatically following the same procedure as if the value difference between Data A and the odometer reading at the moment the engine was turned off is a substantial number such as greater than 2 meters.

(11) Waiting until the on-board computer 16 can no longer detect the car key before it locks the doors allows the driver to get out of the vehicle while the doors are still unlocked. It also allows the driver to open the doors freely to load or unload the vehicle after the driver got out of the car.