Method and apparatus for driving and controlling on-vehicle loads

• US 7,173,347 B2
• Filed: 10/14/2003
• Issued: 02/06/2007
• Est. Priority Date: 10/15/2002
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Obayashi, Kazuyoshi, Tani, Keisuke
• Primary Examiner(s): Vortman; Anatoly
• Assistant Examiner(s): Rutland-Wallis; Michael
• Application Number:
  US10/683,276
• Publication Number:
  US 20040124703A1
• Time in Patent Office: 1,211 Days
• Field of Search: 307/10.1, 307/9.1
• US Class Current: 307/10.1
• CPC Class Codes: B60R 16/0315 using multiplexing techniques multiplexing for transmission of signals G08C15/00; multiplexing for electrical communication in general H04J

Abstract

In an apparatus for driving and controlling plural on-vehicle electrical loads, an on-vehicle power supply generates power to be supplied the loads each having a priority. A power calculating device calculates a current available amount of the power to be supplied from the power supply, and a priority changing device changes one or more of the priorities on the basis of inputted information about a vehicle condition, the information including conditions of the loads. A command producing device produces a command value indicative of an amount of the power to be supplied to each of the loads by using the priorities. In this case, a sum of the power to be supplied to each load is kept within the available amount of the power to be supplied. A controller controls the power to be distributed to each of the loads on the basis of the command value.

Claims

1. An apparatus for driving and controlling a plurality of on-vehicle electrical loads, comprising:

an on-vehicle power supply configured to generate power to be supplied the loads to each of which a priority is given, the plurality of priorities being used for distributing the generated power to the loads;

a power calculating device configured to calculate a currently available amount of the power to be supplied from the power supply;

a power-consumption calculating device calculating an amount of necessary power of each load and an amount of minimum necessary power of each load on the basis of information in relation to the vehicle condition, the information including conditions of the loads, the necessary power being defined as a power consumption of each load on condition that there is no limitation in supplying the power to the loads, and the minimum necessary power being defined as a minimum power consumption necessary for performing a function given to each load;

a priority changing device configured to change one or more of the priorities on the basis of the information;

a command calculating device calculating a command value indicative of an amount of the power to be supplied to the loads by using the priorities, the amount of the necessary power, and the amount of the minimum necessary power on condition that a sum of the power to be supplied to the loads being kept within the currently available amount of the power and the power to be supplied to each load being either zero or more than the minimum necessary power; and

a controller configured to control the power to be distributed to each of the loads on the basis of the command value.

2. The apparatus according to claim 1, wherein the priority changing device includes

detecting means for detecting a period of time counted from a time instant at which a request for supplying the power to the load is issued, to a time instant at which a predetermined period of time passes after supplying the power to the load is started, the normal priority being provided in a normal state of the apparatus, and

means for, load by load, raising the priority in level than a normal priority given to each load during the period of time detected by the detecting means.

3. The apparatus according to claim 1, wherein the priority changing device includes

determining means for determining whether or not the power to be supplied to the load is lower than the necessary power of the load and

means for changing, load by load, a level of the priority given to a load of the loads on the basis of the information originated from a crew on the vehicle, in cases where the determining means determines that the power to be supplied to the load is lower than the necessary power of the load.

4. The apparatus according to claim 1, wherein the priority changing device includes

determining means for determining whether or not the power to be supplied to the load is lower than the necessary power of the load,

a memorizing device memorizing information about record of operations directed to each load and done by a crews, and

a changing device changing a level of the priority given to the load on the basis of the memorized information about the record of operations, in cases where the determining means determines that the power to be supplied to the load is lower than the necessary power of the load, the operation record information composing the information.

5. The apparatus according to claim 4, wherein the priority changing device includes

means for detecting a period of time counted from at a time instant when the power supplied to the load comes below the necessary power of the load, to a time instant when a predetermined period of time passes after the power supplied to the load comes below the necessary power and

a determination device determining whether or not an operation for increasing and decreasing an output of the load has been performed a predetermined number of times or more during the period of time detected by the detecting means.

6. The apparatus according to claim 1, wherein the priority changing device is configured to have the priorities which are sectioned into a plurality of priority ranges depending on the levels thereof, rankings of the priorities being fixed within each of the priority ranges.

7. The apparatus according to claim 1, wherein the priority changing device includes a device deciding the one or more priorities on the basis of a difference between a current level of an operating condition of each load and a target level of the operating condition of the load.

8. The apparatus according to claim 1, wherein the priority changing device includes

detecting means for detecting a period of time counted from a time instant at which a request for supply the power to the load is issued, to either a first time instant at which a predetermined period of time passes after supplying the power to the load is started or a second time instant at which supplying the power to the load is started, the normal priority being provided in a normal state of the apparatus, and

means for, load by load, lowering the priority in level than a normal priority given to a load of the loads during the period of time detected by the detecting means.

9. The apparatus according to claim 1, wherein the command calculating device is configured to calculate the command value for each load so that the power is distributed to the loads in the descending order of the priorities.

10. The apparatus according to claim 1, wherein the power-consumption calculating device includes

detecting means for detecting a period of time counted from a time instant at which a request for supply the power to the load is issued, to a time instant at which a predetermined period of time passes after supplying the power to the load is started, the normal levels being provided in a normal state of the apparatus, and

a device raising, load by load, amounts of both the necessary power and the minimum necessary power than normal levels given to a load of the loads during the period of time detected by the detecting means.

11. The apparatus according to claim 10, wherein the power supply is provided with a generator generating the electric power and an energy storage device into which the generated electric power is accumulated,

the apparatus further comprising:

a device calculating an amount of the power generated by the generator;

a device calculating a requested amount of power to be charged to the energy storage device; and

a device controlling the generator so that the amount of the generated power increases, when a total amount of both a sum of the necessary power of the loads and the requested amount of power to be charged exceeds the amount of the generated power.

12. The apparatus according to claim 1, wherein the loads include a load having a step-like changing power consumption characteristic and the command calculating device is configured to calculate the command value indicative of the amount of the power that is consistent with one of power consumption amounts provided at each step of the step-like changing power consumption characteristic of the load.

13. The apparatus according to claim 1, wherein the command calculating device includes

a calculation/supply element calculating the command value indicative of the amount of the power so that an amount of power equal to the necessary power of a given load of the loads is supplied to the given load and an amount of power equal to the minimum necessary power is supplied to remaining loads other than the given load in a descending order of the priorities given to the remaining loads within a power region up to the currently available power.

14. The apparatus according to claim 13, wherein the command calculating device includes

a determination element determining whether or not a condition that the available power is higher than a sum of power distributed to the loads is met at a last time of processing;

and

a supply element supplying, to the remaining loads, an amount of power corresponding to a difference between the currently available power and the sum of power distributed to the loads at the last time of processing in the descending order of the priorities given to the remaining loads, when the condition is met.

15. The apparatus according to claim 1, wherein the power-consumption calculating device comprises a plurality of demand calculating devices each calculating, load by load, the priority, the amount of the necessary power, and the amount of the minimum necessary power,

the command calculating device includes a calculating means for calculating the command value on the basis of the priority, the amount of the necessary power, and the amount of the minimum necessary power provided by the plurality of demand calculating devices, and

the controller includes a plurality of load controlling devices to individually control the power to be supplied to the plurality of loads on the basis of the command value provided by the calculating means,

wherein each demand calculating device is incorporated in each load controlling device.

16. The apparatus according to claim 1, wherein the plurality of loads are classified into a plurality of different load groups of which priority ranges are different from each other,

the controller includes a power distributing device distributing the power to the loads in different ways, load group by load group.

17. The apparatus according to claim 1, wherein the plurality of loads are classified into two load groups consisting of an upper-priority load group of which priorities are higher and a lower-priority load group of which priorities are lower, and

wherein, for the upper-priority load group, a power higher than the minimum necessary power but lower than the necessary power is distributed to the loads of the upper-priority load group in a descending order of the priorities, on condition that a sum of the power to be distributed to the loads of the upper-priority load group is maintained within the available power;

and for the lower-priority load group, a power equal to the minimum necessary power is distributed to the loads of the lower-priority load group in a descending order of the priorities, on condition that a sum of the power to be distributed to the loads of the lower-priority load group is maintained within a difference power obtained by subtracting from the available power the sum of the power distributed to the loads of the upper-priority load group, wherein in the case that the difference power is higher than the sum of the power to be distributed to the loads of the lower-priority load group, an amount of power corresponding to a difference between the difference power and the sum is distributed to the loads of the lower-priority load group in the descending order of the priorities.

18. The apparatus according to claim 1, wherein one of the loads is a blower of an on-vehicle air conditioner, the blower also working as a defroster by blowing air toward a window glass of a vehicle,

wherein the priority changing device is configured to raise the priority given to the blower when the blower is used as the defroster.

19. The apparatus according to claim 1, wherein the power-consumption calculating device includes means for treating, of the plurality of electrical loads, N-pieces (N:

equal to or larger than

     2) of electrical

loads, to which the power supply is out of control, as imaginary electrical load of “

N−

1”

pieces or less each consuming the necessary power.

20. The apparatus according to claim 19, wherein the power-consumption calculating device includes an element for correcting the necessary power of either one of the electrical loads of which power supply is out of control or the imaginary electrical loads on the basis of an actually measured amount of power consumption.

21. An apparatus for driving and controlling a plurality of on-vehicle electrical loads, comprising:

an on-vehicle power supply configured to generate power to be supplied to the loads to each of which a priority is given, the plurality of priorities being used for distributing the generated power to the loads;

a power calculating device configured to calculate a currently available amount of the power to be supplied from the power supply,

a power-consumption calculating device calculating an amount of necessary power of each load and an amount of minimum necessary power of each load on the basis of information in relation to the vehicle condition, the information including conditions of the loads, the necessary power being defined as a power consumption of each load on condition that there is no limitation in supplying the power to the loads, and the minimum necessary power being defined as a minimum power consumption necessary for performing a function given to each load;

a command calculating device calculating a command value indicative of an amount of the power to be supplied to the loads by using the priorities, the amount of the necessary power, and the amount of the minimum necessary power on condition that a sum of the power to be supplied to the loads being kept within the currently available amount of the power and the power to be supplied to each load being either zero or more than the minimum necessary power; and

a controller configured to control the power to be distributed to each of the loads on the basis of the command value.

22. The apparatus according to claim 21, wherein the power-consumption calculating device includes

detecting means for detecting a period of time counted from a time instant at which a reciuest for supply the power to the load is issued, to a time instant at which a predetermined period of time passes after supplying the power to the load is started, the normal levels being provided in a normal state of the apparatus, and

a device raising, load by load, amounts of both the necessary power and the minimum necessary power than normal levels given to a load of the loads during the period of time detected by the detecting means.

23. The apparatus according to claim 22, wherein the power supply is provided with a generator generating the electric power and an energy storage device into which the generated electric power is accumulated,

the apparatus further comprising:

a device calculating an amount of the power generated by the generator;

a device calculating a requested amount of power to be charged to the energy storage device; and

a device controlling the generator so that the amount of the generated power increases, when a total amount of both a sum of the necessary power of the loads and the requested amount of power to be charged exceeds the amount of the generated power.

24. The apparatus according to claim 21, wherein the loads include a load having a step-like changing power consumption characteristic and the command calculating device is configured to calculate the command value indicative of the amount of the power that is consistent with one of power consumption amounts provided at each step of the step-like changing power consumption characteristic of the load.

25. The apparatus according to claim 21, wherein the command calculating device includes

a calculation/supply element calculating the command value indicative of the amount of the power so that an amount of power equal to the necessary power of a given load of the loads is supplied to the given load and an amount of power equal to the minimum necessary power is supplied to remaining loads other than the given load in a descending order of the priorities given to the remaining loads within a power region up to the currently available power.

26. The apparatus according to claim 25, wherein the command calculating device includes

a determination element determining whether or not a condition that the available power is higher than a sum of power distributed to the loads is met at a last time of processing;

and

a supply element supplying, to the remaining loads, an amount of power corresponding to a difference between the currently available power and the sum of power distributed to the loads at the last time of processing in the descending order of the priorities given to the remaining loads, when the condition is met.

27. The apparatus according to claim 21, wherein the power-consumption calculating device comprises a plurality of demand calculating devices each calculating, load by load, the priority, the amount of the necessary power, and the amount of the minimum necessary power,

the command calculating device includes a calculating means for calculating the command value on the basis of the priority, the amount of the necessary power, and the amount of the minimum necessary power provided by the plurality of demand calculating devices, and

the controller includes a plurality of load controlling devices to individually control the power to be supplied to the plurality of loads on the basis of the command value provided by the calculating means,

wherein each demand calculating device is incorporated in each load controlling device.

28. A method for driving and controlling a plurality of on-vehicle electrical loads, comprising steps of:

generating power to be supplied the loads to each of which a priority is given, the plurality of priorities being used for distributing the generated power to the loads;

calculating a currently available amount of the power to be supplied from the power supply;

calculating an amount of necessary power of each load and an amount of minimum necessary power of each load on the basis of information in relation to the vehicle condition, the information including conditions of the loads, the necessary power being defined as a power consumption of each load on condition that there is no limitation in supplying the power to the loads, and the minimum necessary power being defined as a minimum power consumption necessary for performing a function given to each load;

changing one or more of the priorities on the basis of the information;

calculating a command value indicative of an amount of the power to be supplied to the loads by using the priorities, the amount of the necessary power, and the amount of the minimum necessary power on condition that a sum of the power to be supplied to the loads being kept within the currently available amount of the power and the power to be supplied to each load being either zero or more than the minimum necessary power; and

controlling the power to be distributed to each of the loads on the basis of the command value.

29. An apparatus for driving and controlling a plurality of on-vehicle electrical loads, an on-vehicle power supply generating power to be supplied the loads to each of which a load priority is given, the load priority indicative of a priority order for supplying the power among the loads, the apparatus compnsing:

a power calculating device configured to calculate a currently available amount of the power to be supplied from the power supply;

a first calculating device configured to calculate an amount of first power to be supplied to each load group on the basis of a group priority indicative of a priority order for supplying the power among the load groups, each load group being any one of a plurality of groups obtained by dividing the plurality of loads, a sum of the first power to each load group being kept within the currently available amount of the power;

a second calculating device configured to calculate an amount of second power to be supplied to each load belonging to any load group on the basis of the load priority, a sum of the second power to each load belonging to the load group being kept within the amount of the first power supplied to the load group; and

a controller configured to control the power to be distributed to each of the loads on the basis of a command value indicative of the amount of the first power to each load.

30. The apparatus according to claim 29, further comprising a third calculating device configured to calculate at least one of the group priority and the load priority on the basis of information about conditions of a vehicle.

31. The apparatus according to claim 30, wherein each of the plurality of load groups is composed of one or more loads whose functions concerning the vehicle are classified into the same category.

32. The apparatus according to claim 31, wherein the third calculating device is configured to calculate the group priority based on a current value indicative of necessity for the vehicle functions for any group decided by the information.

33. The apparatus according to claim 31, further comprising a detector to detect a warm-up state of the vehicle,

wherein the third calculating device is configured to calculate the group priority based on the detected warm-up state.

34. The apparatus according to claim 31, further comprising a detector to detect a brightness level in environment around the vehicle,

wherein the third calculating device is configured to calculate the group priority based on the detected brightness level.

35. The apparatus according to claim 30, wherein the third calculating device is configured to calculate the group priority to be given to a specific load group, which is higher in a level than the group priority to be given to one or more remaining load groups.