System and method of monitoring a load condition of a vehicle

• US 8,412,485 B2
• Filed: 06/10/2010
• Issued: 04/02/2013
• Est. Priority Date: 11/29/2006
• Status: Expired

• Current Assignee: VPG Systems UK Limited
• Original Assignee: Vishay PM Onboard Limited (VPG Systems UK Limited)
• Inventors: Brown, Duncan
• Primary Examiner(s): Caputo, Lisa
• Assistant Examiner(s): WILLIAMS, JAMEL E
• Application Number:
  US12/797,968
• Publication Number:
  US 20100289658A1
• Time in Patent Office: 1,027 Days
• Field of Search: 702/174, 340/440
• US Class Current: 702/174
• CPC Class Codes: B60G 17/017 characterised by their use when the vehicle is stationary, e.g. during loading, engine start-up or switch-off
• CPC Class Codes: B60G 17/01908 Acceleration or inclination sensors characterised by the use of gyroscopes B60G21/08
• CPC Class Codes: B60G 2200/142 with a single lateral arm, e.g. MacPherson type
• CPC Class Codes: B60G 2204/11 Mounting of sensors thereon
• CPC Class Codes: B60G 2204/1162 directly mounted on the suspension arm
• CPC Class Codes: B60G 2400/0511 Roll angle
• CPC Class Codes: B60G 2400/0512 Pitch angle
• CPC Class Codes: B60G 2400/60 Load
• CPC Class Codes: B60G 2600/02 Retarders, delaying means, dead zones, threshold values, cut-off frequency, timer interruption
• CPC Class Codes: B60G 2600/042 Monitoring means
• CPC Class Codes: B60G 2600/044 Alarm means
• CPC Class Codes: B60G 2600/202 using a remote, e.g. cordless, transmitter or receiver unit
• CPC Class Codes: B60G 2800/70 Estimating or calculating vehicle parameters or state variables
• CPC Class Codes: G01G 19/08 for incorporation in vehicles
• CPC Class Codes: G01G 23/3735 using a digital network

Abstract

A system and method for indicating the load condition of a vehicle having suspension components comprising:

• • at least one of an inclinometer or an accelerometer mounted on at least one suspension component to measure the deflection angle of the suspension component; and
  • a controller configured to use deflection angle and generate an output representative of the load condition of the vehicle.

Claims

1. A system for indicating a weight of payload of a vehicle having suspension components comprising:

a static gravity-sensing accelerometer mounted on at least one suspension component and configured as an inclinometer to measure a deflection angle of the at least one suspension component;

a controller configured to generate an output signal representative of the weight of payload of the vehicle, wherein the controller uses the deflection angle to generate the output signal; and

a sensory output device which indicates the weight of payload of the vehicle in response to the output signal of the controller;

wherein the controller is configured to compare the measured deflection angle of the at least one suspension component to a predetermined threshold and generate the output signal when the measured deflection angle reaches the predetermined threshold.

2. The system as claimed in claim 1, further comprising:

at least one reference device adapted to generate a reference signal relating to the attitude of the vehicle, wherein the controller is further configured to receive the reference signal and adapt the output signal representative of the load condition to account for a variance in the measured deflection angle of the suspension component created by the attitude of the vehicle.

3. The system as claimed in claim 1, wherein the sensory output device comprises a display configured to show the load condition of the vehicle.

4. The system as claimed in claim 1, wherein the sensory output device comprises a flashing strobe light, a siren, or a buzzer.

5. The system as claimed in claim 1, wherein the at least one of an inclinometer or an accelerometer comprises a wireless signal transmitter and wherein the controller comprises an associated wireless signal receiver such that the at least one of an inclinometer or an accelerometer and the controller may communicate with each other over a wireless channel.

6. A method of monitoring the weight of payload of a vehicle having suspension components, comprising:

monitoring a deflection angle of at least one suspension component using a static gravity-sensing accelerometer mounted on the at least one suspension component and configured as an inclinometer;

comparing the deflection angle of the at least one suspension component to a predetermined threshold;

generating an output signal which is representative of the weight of payload of the vehicle when the deflection angle reaches the predetermined threshold; and

using the output signal to activate a sensory output device which indicates the weight of payload of the vehicle.

7. The method as claimed in claim 6, wherein the sensory output device shows the load condition of the vehicle on a display.

8. The method as claimed in claim 6, wherein the sensory output device displays or sounds at least one of an overload warning or a near overload warning.

9. The method as claimed in claim 6, further comprising:

monitoring the deflection angle of the at least one suspension component at two separate time intervals;

determining the difference of the deflection angles from the two separate time intervals; and

generating a disturbance signal indicating that motion is detected if the difference is greater than a predetermined amount.

10. The method as claimed in claim 6, further comprising:

sampling the monitored deflection angle at discrete intervals and storing the sampled data as n sample sets each comprising a number of samples, where n is an integer; and

generating a disturbance signal indicating that motion is detected if the difference between two successive sample sets is greater than a predetermined value.

11. A method of monitoring the weight of payload of a vehicle having suspension components comprising:

monitoring a deflection angle of at least one suspension component using a static gravity-sensing accelerometer mounted on the at least one suspension component and configured as inclinometer;

comparing the monitored deflection angle to a predetermined threshold; and

activating a sensory output device when the monitored deflection angle reaches the predetermined threshold.

12. The method as claimed in claim 11, wherein the sensory output device indicates the load condition of the vehicle.

13. The method as claimed in claim 11, wherein the sensory output device shows the load condition of the vehicle on a display.

14. The method as claimed in claim 11, wherein the sensory output device displays or sounds at least one of an overload warning or a near overload warning.