Granted Patent B2

US 7,991,525 · App. 12/189,117 · Granted Aug 2, 2011

Abstract

Claims (43)

1. A method for receiving in-vehicle information regarding diesel fuel cloud point condition, the method comprising:

establishing communication between a telematics unit in a vehicle and i) a global positioning system device, ii) a database at a call center or operatively connected to the telematics unit, and iii) a cloud point monitoring device in the vehicle;

receiving, at the telematics unit from at least one of i, ii, iii or an in-vehicle sensor, information pertaining to vehicle location, cloud point, and ambient temperature;

determining from the information whether fuel in a fuel system of the vehicle is reaching cloud point or will reach cloud point within a given time period; and

transmitting an in-vehicle alert when the fuel in the vehicle fuel system is reaching cloud point or will reach cloud point within a given time period.

2. The method of claim 1 wherein a driver information center audibly or visually delivers the in-vehicle alert.

3. The method of claim 1 wherein receiving the information includes:

receiving a current time and vehicle location at the telematics unit;

receiving a cloud point measurement time and temperature at the telematics unit; and

receiving a current measurement of the ambient temperature at the telematics unit.

4. The method of claim 3 , further comprising:

determining whether the ambient temperature minus the cloud point temperature is less than or equal to a predetermined threshold; and

if the ambient temperature minus the cloud point temperature is less than or equal to the cloud point temperature threshold, than determining whether the fuel in the vehicle fuel system is reaching cloud point or can reach cloud point within a given time period is accomplished by:

obtaining a vehicle range; and

recognizing that a lowest forecasted temperature within the vehicle's range is within a predetermined number of degrees of the cloud point.

5. The method of claim 3 wherein receiving the cloud point measurement time and temperature at the telematics unit includes:

retrieving a stored cloud point measurement time and temperature from a memory in the telematics unit;

recognizing that the stored cloud point measurement time and temperature is not current; and

measuring a current cloud point temperature via an on-board sensor configured to measure cloud point.

6. The method of claim 3 wherein receiving the cloud point measurement time and temperature at the telematics unit includes:

retrieving a stored cloud point measurement time and temperature from a memory in the telematics unit; and

recognizing that the stored cloud point measurement time and temperature is current.

7. The method of claim 3 , further comprising:

receiving a last update of ambient temperature and vehicle location from the database operatively connected to the telematics unit; and

if the last update is not current, contacting the call center database to obtain information related to then-current ambient temperature and then-current vehicle location.

8. The method of claim 1 wherein the in-vehicle alert is visually displayed on a display of a driver information center, and wherein the display is an in-vehicle radio display, an infotainment center display, an audio component display, or an in-vehicle display separate from at least one of the in-vehicle radio display, the infotainment center display, or the audio component display.

9. A system for generating in-vehicle information regarding a diesel fuel cloud point condition, the system comprising:

a telematics unit in a vehicle;

a global positioning system device configured to transmit vehicle location information to the telematics unit;

a database, operatively connected to the telematics unit or at a call center, configured to transmit stored information to the telematics unit;

a cloud point monitoring device in the vehicle configured to measure a cloud point temperature and transmit such measurement to the telematics unit; and

a driver information center in the vehicle configured to receive an alert when the telematics unit recognizes, based on the received information and measurements, that the fuel in a fuel system of the vehicle is reaching the cloud point or can reach cloud point within a given time period.

10. The system of claim 9 wherein:

the global positioning system device is configured to transmit a current time and vehicle location to the telematics unit;

the cloud-point monitoring device is configured to transmit a current cloud point temperature reading to the telematics unit; and

a temperature sensor of the vehicle is configured to transmit a current measurement of ambient temperature to the telematics unit.

11. The system of claim 10 wherein the telematics unit is further configured to:

determine whether the current ambient temperature minus the current cloud point temperature is less than or equal to a predetermined threshold;

if the current ambient temperature minus the current cloud point temperature is less than or equal to the cloud point temperature threshold, than;

obtain a vehicle range; and

recognize that a lowest forecasted temperature within the vehicle's range is within a predetermined number of degrees of the cloud point temperature.

12. The system of claim 9 wherein the driver information center includes a display configured to visibly display the alert.

13. The system of claim 12 wherein the display of the driver information center is an in-vehicle radio display, an infotainment center display, an audio component display, or an in-vehicle display separate from at least one of the in-vehicle radio display, the infotainment center display and the audio component display.

Assignments (16)