JP2006130953A - Electric power controlling device and electric power controlling method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To properly supply electric power to a plurality of electric drive devices. <P>SOLUTION: The electric power controlling device comprises a current sensor 3 detecting a current value of a battery; a voltage detecting means 21 detecting a voltage value of the battery 2; operation state detecting means 51, 61, 71 respectively detecting the operation state of an electric steering 5, an electric rake 6, and various controlling devices 7 which are the electric drive device; and and operation output ratio outputting means 4 outputting an operation output ratio of the electric steering 5, the electric brake 6, and the various controlling device 7 on the basis of the current value, the voltage value, and each operation state. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a power control apparatus and a power control method, for example, a power control apparatus and a power control method for a vehicle.

  In recent years, various electric drive devices are mounted on automobiles for the purpose of further enhancement of functions. In particular, vehicles equipped with electric brakes, electric steering, etc. that consume a large amount of power have been developed one after another. When such an electric drive device with high power consumption is mounted on a vehicle, the burden on the battery naturally increases. For this reason, although the capacity | capacitance of a battery or a generator is enlarged and it respond | corresponds to the increase request | requirement of electric power supply, there existed a problem that the mass and cost of a vehicle increased with such a means.

  In order to deal with such a problem, as shown in Patent Document 1, when the total power consumption of a plurality of electric drive devices mounted on a vehicle exceeds a set value, priority is given based on a predetermined priority order. Electric power is supplied only to the electric drives with higher ranks.

JP 2003-259549 A

  However, even if it is configured to supply power only to a higher priority device based on a predetermined priority order, it does not always match the actual vehicle situation. For example, for a plurality of electric drive devices , Even though it is in a state in which power can be supplied, there may be a case where power is supplied only to a single electric drive device, and power is appropriately supplied to each electric drive device. I could not say it.

  SUMMARY An advantage of some aspects of the invention is that it provides a power control device and a power control method capable of appropriately supplying power to each electric drive device.

  In order to achieve the above object, in the present invention, current detection means for detecting the current value of the battery, voltage detection means for detecting the voltage value of the battery, and operation status detection means for detecting the operation status of the electric drive device And an operation output ratio output means for outputting an operation output ratio to each electric drive unit based on the current value, the voltage value, and the operation status.

  In the present invention, since the operation output ratio of each electric drive device is determined based on the current value, the voltage value, and the operation status, it is possible to appropriately supply electric power to each electric drive device.

First Embodiment FIG. 1 is a diagram showing a basic configuration in the present embodiment. DESCRIPTION OF SYMBOLS 1 is a generator, 2 is a battery which supplies electric power, 3 is a current sensor (current detection means) which measures the electric current supplied from the battery 2, 4 calculates the electric power supply power of the battery 2, An operation output ratio output means 5 for outputting an operation output ratio, 5 is an electric steering which is an electric drive device, 6 is an electric brake which is also an electric drive device, and 7 is various control devices which are also an electric drive device.

  In addition, although the connection between said apparatuses is shown with the single line in the figure for convenience, it is actually comprised by several electric wirings, such as a power supply line, a signal wire | line, earth | ground, a communication wire. Furthermore, although omitted in the drawing, the operation output ratio output means 4, the electric steering 5, the electric brake 6, and various control devices 7 are connected by a communication line (CAN or FlexRay). Further, electric power is supplied from the generator 1 and the battery 2 to the current sensor 3, the electric steering 5, the electric brake 6, and various control devices 7 via the operation output ratio output means 4.

  FIG. 2 is a diagram showing a basic configuration of the power control apparatus according to the present embodiment. The battery 2 includes voltage detection means 21 that detects and outputs the voltage value of the battery 2, and outputs detection values from the voltage detection means 21 and the current sensor 3 to the operation output ratio output means 4, respectively.

  The operation output ratio output means 4 includes a dischargeable current value determining means 41 for determining a dischargeable current value of the battery 2 from the capacity, the minimum guaranteed temperature, and the minimum guaranteed voltage of the battery 2, and the current value, voltage value, and dischargeable current value. A power supplyable power calculation unit 43 that calculates power that can be supplied based on the power, a total power consumption estimated value calculation unit 44 that estimates the total power consumption of each electric drive device from the operating status of each electric drive device, and power A determination value determining means 45 for determining a determination value from the suppliable power, an operation output ratio determining means 46 for determining an operation output ratio of each electric drive unit based on the determination value and the estimated total power consumption, and an operation output ratio output It comprises a CPU 47 for controlling the means 4 and an input / output port 48 for control.

  The electric steering 5 includes an operation state detection unit 51 that outputs an operation state of the electric steering 5 and a control command output adjustment unit 52 that adjusts a control command output based on the operation output ratio. The control device 7 includes an operation state detection unit 61 that outputs an operation state of the electric brake 6 and a control command output adjustment unit 62 that adjusts a control command output based on the operation output ratio. Operating condition detecting means 71 for outputting the operating condition, and control command output adjusting means 72 for adjusting the control command output based on the operation output ratio.

  Further, the current detection value from the current sensor 3, the voltage detection value from the voltage detection means 21, and the respective operation status outputs detected from the electric steering 5, the electric brake 6, and the various control devices 7 are output as the operation output ratio. Input to means 4.

  Next, the electric steering 5, the electric brake 6, and the various control devices 7 as control objects of the present invention will be described.

  The electric steering 5 is, for example, referred to as steering-by-wire, and a steering motor is provided in a steering mechanism for a front wheel of a vehicle, and steering control is performed by controlling this motor. The electric steering 5 calculates and controls the steering force generated according to the output of the steering angle sensor. At the same time, the electric steering 5 outputs the operation status of the electric steering 5 to the operation output ratio output means 4. At the same time, the operation output ratio is input from the operation output ratio output means 4, and the control command output adjustment means 52 adjusts the control command output according to the electrical characteristics of the electric steering 5 based on the operation output ratio.

  The electric brake 6 has a configuration in which, for example, a motor that presses the brake pad against the caliper of the disc brake is provided, and the braking force is controlled according to the power supplied to the motor. Depending on the output of a stroke sensor, a wheel speed sensor, or the like, The brake force to be generated is calculated and controlled. The electric brake 6 also performs control such as anti-lock brake control (ABS), traction control (TRC), and side slip control (VDC) of the vehicle body. At the same time, the electric brake 6 outputs the operating state of the electric brake 6 to the operation output ratio output means 4. At the same time, the operation output ratio is input from the operation output ratio output means 4, and the control command output is adjusted by the control command output adjustment means 62 according to the electrical characteristics of the electric brake 6 based on the operation output ratio.

  Examples of the various control devices 7 include audio devices such as light / air conditioner / wiper / radio, CD, car navigation system, and the like. These various control devices 7 output the operation status (control status) of the load motor to the operation output ratio output means 4. At the same time, the operation output ratio is input from the operation output ratio output means 4, and the control command output is adjusted by the control command output adjustment means 72 according to the electrical characteristics of the various control devices 7 based on the operation output ratio.

  Next, the operation of the power control apparatus shown in FIGS. 1 and 2, that is, the power control method according to the present invention will be described. In the operation output ratio output means 4, first, a dischargeable current value determining means 41 obtains a dischargeable current value. For example, in the case of a Pb battery, the dischargeable current value is determined from the battery capacity, the minimum guaranteed temperature of the battery, and the minimum guaranteed voltage of the battery terminal, as shown in the Pb battery 10V output holding characteristic of FIG. For example, in the example shown in FIG. 3, in order to guarantee a battery capacity of 9 L, an air temperature of −30 ° C., and a minimum of 10 V, the current value needs to be suppressed to 160 A, and the dischargeable current value is 160 A.

  Next, the power supply power calculation means 43 calculates the power supply power based on the voltage value, the current value, and the dischargeable current value.

  Next, based on the current operating conditions of the electric steering 5, the electric brake 6, and the various control devices 7, the total power consumption estimated value obtained by totaling the power consumption estimated values consumed by these electric drive devices is obtained as the total power consumption estimated value. Calculation is performed by the calculation means 44.

  Next, a determination value is determined by the determination value determination means 45 from the power that can be supplied with power.

  Next, the operation output ratio determination means 46 compares the total power consumption estimated value and the determination value. In this case, when the total power consumption estimated value <determination value, a signal for setting the operation output ratio to 100% is output to the electric steering 5, the electric brake 6, and the various control devices 7, and the control is in a state of 100% output as it is. Will continue. On the other hand, when the total power consumption estimated value ≧ the determination value, since the margin of the battery 2 is small, the electric steering 5, the electric brake 6, and the various control devices are set so that the determination value−the total power consumption estimated value> 0. 7 outputs a signal for setting the operation output ratio to less than 100%.

  Next, the electric steering 5, the electric brake 6, and the various control devices 7 that have been input with values less than 100% as the operation output ratios are the operation output ratios measured in advance by the respective control command output adjustment means 52, 62, 72. Using another power characteristic, the control command output of each electric drive device is adjusted with the corresponding power characteristic according to the operation output ratio of less than 100%.

  For example, in the response characteristic with respect to the input current of the electric brake shown in FIG. 4, the required current at the peak in the transient region is 100 A as shown in the response (A) at the time of 100% operation indicated by the command (A). By using the command (B) and the command (C) which are multi-step commands, the required current at the peak time can be reduced to about 70 A and about 40 A, respectively, in the transient region. Therefore, in the electric brake 6 that controls the front, rear, left and right wheels with a motor, when an operation output ratio of less than 100% is input, the control command value to the load motor is set to a step command (100% operation command). The peak of the current value can be lowered by changing from A) to (B) or (C), which is a multi-step command.

  That is, the electric power consumption of the electric brake 6 requires several times the current in the transient region as compared with the steady region, and when the current value is estimated to be insufficient in the 100% operation of the step command (A), there are multiple steps. The peak of the current value can be lowered by changing to the command (B) or (C). As a specific means in this case, a multi-step command can be realized by slowing the pressure increase speed of the control hydraulic pressure as much as possible, and the inrush current at the initial motor operation is suppressed in the transient region. can do.

  In the case of a front-wheel drive vehicle equipped with an engine mounted on the front of the vehicle body, the front motor is driven first by braking the two front wheels and then the rear wheels by two steps. Alternatively, by outputting a multistage command, the peak of the current value can be lowered, and a system reset due to a decrease in battery voltage due to instantaneous overload can be prevented.

  As described above, in the power control device and the power control method according to the present embodiment, the operation output ratio of each electric drive device is determined based on the current value and voltage value of battery 2 and the operation status of the electric drive device. Therefore, electric power can be appropriately supplied to each electric drive device. Moreover, since the power supplyable power is calculated from the current value, voltage value, and dischargeable current value of the battery 2, the power supplyable power can be accurately calculated. Furthermore, based on the operation output ratio, it is possible to suppress the peak value of transient energy consumption by properly using the control instructions for the plurality of electric drive devices for the step command and the multi-step command. The enlargement and cost increase of the battery 2 and the generator 1 can be prevented.

Second Embodiment FIG. 5 is a diagram showing a basic configuration of a second embodiment of the present invention. Reference numeral 10 denotes an electric steering, which has a configuration in which the operation output ratio output means 4 described in the first embodiment is mounted inside the electric steering 10. 8 is a temperature sensor for measuring the outside air temperature, and is connected to the electric steering 10. The power supplyable power calculating means 43 calculates the power supplyable power based on the current value, the voltage value, the dischargeable current value, and the outside air temperature. calculate.

  In the second embodiment, a current can be appropriately supplied to each electric drive device, and an increase in size and cost of the battery 2 and the generator 1 can be prevented. Further, since the power supplyable power is calculated using the dischargeable current value of the battery 2 and the outside air temperature measured by the temperature sensor 8, the power supplyable power can be accurately calculated, and accurate and fine control is performed. Can be done. In addition, by incorporating the operation output ratio output means 4 in the electric steering 10, it becomes possible to preferentially operate a function (for example, a by-wire control device) related to the basic operation of the vehicle. In addition, it is good also as a structure which incorporates the operation output ratio output means 4 in the electric brake 6 which is another electric drive device, or various control apparatuses 7. FIG.

Third Embodiment FIG. 6 is a diagram showing a basic configuration of a third embodiment of the present invention. Reference numeral 9 denotes an engine control module that controls the engine of the vehicle. In this embodiment, the operation output ratio output means 4 described in the first embodiment is mounted inside the engine control module 9. Further, a temperature sensor 8 for measuring the outside air temperature is connected to the engine control module 9, and the power supplyable power calculating means 43 is a power supplyable power based on the current value, the voltage value, the dischargeable current value, and the outside air temperature. Is calculated.

  By adopting such a configuration, it is possible to appropriately supply current to each electric drive device, to accurately calculate power that can be supplied with power, and to increase the size and cost of the battery 2 and the generator 1. It can be prevented. Furthermore, it is not necessary to dispose the operation output ratio output means 4 as an independent control component, and an effect of saving space is also produced.

It is a figure which shows the basic composition in the 1st Embodiment of this invention. It is a figure which shows the basic composition of the power control apparatus in the 1st Embodiment of this invention. It is a figure which shows the 10V output holding characteristic of a Pb battery. It is a figure which shows the response current characteristic with respect to the input command of an electric brake. It is a figure which shows the basic composition in the 2nd Embodiment of this invention. It is a figure which shows the basic composition in the 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Generator 2 ... Battery 3 ... Current sensor 4 ... Actuation output ratio output means 5 ... Electric steering 6 ... Electric brake 7 ... Various control devices 8 ... Temperature sensor 9 ... Engine control module 10 ... Electric steering 21 ... Voltage detection means 41 ... dischargeable current value determining means 43 ... power supplyable power calculating means 44 ... total power consumption estimated value calculating means 45 ... determination value determining means 46 ... operation output ratio determining means 51 ... operating state detecting means 52 ... control command output adjusting means 61 ... Operation status detection means 62 ... Control command output adjustment means 71 ... Operation status detection means 72 ... Control command output adjustment means

Claims (10)

In a power control device that controls power supplied from a battery to a plurality of electric drive devices,
Current detecting means for detecting the current value of the battery; voltage detecting means for detecting the voltage value of the battery; operating condition detecting means for detecting an operating condition of the electric drive device; the current value; the voltage value; An electric power control apparatus comprising: an operation output ratio output means for outputting an operation output ratio of each of the electric drive units based on the operation state.   The operation output ratio output means calculates power supplyable power based on the voltage value and the current value, power supplyable power calculation means, and based on the operation status, the total power consumption estimated value of the electric drive device And a power output ratio determining means for determining the power output ratio so that a difference between the power supplyable power and the power consumption estimated value is positive. The power control apparatus according to claim 1.   An outside air temperature measuring unit that measures outside air temperature is provided, and the power supplyable power calculating unit calculates the power supplyable power based on the voltage value, the current value, and the outside air temperature. Item 3. The power control apparatus according to Item 2.   The battery has a dischargeable current value determining means for determining a dischargeable current value based on a capacity of the battery, a minimum guaranteed temperature of the battery, and a minimum guaranteed voltage of the battery, and the power supplyable power calculation means includes the current value The power control device according to claim 2, wherein the power supply power is calculated based on the voltage value and the dischargeable current value.   An outside air temperature measuring means for measuring an outside air temperature; and a dischargeable current value determining means for determining a dischargeable current value based on a minimum guaranteed temperature of the battery and a minimum guaranteed voltage of the battery, and the power supplyable power The power control apparatus according to claim 2, wherein the calculation unit calculates the power that can be supplied based on the current value, the voltage value, the outside air temperature, and the dischargeable current value.   6. The power control according to claim 1, further comprising control command output adjusting means for adjusting a control command output in accordance with an electrical characteristic of each of the electric drive units based on the operation output ratio. apparatus.   7. The electric power according to claim 6, wherein the control command output adjusting means sets a control command value to the load motor of the electric drive device as a step command or a multistage command based on the operation output ratio. Control device.   8. The electric power control apparatus according to claim 1, wherein the electric drive device is an electric steering, and the operation output ratio output means is provided in the electric steering.   8. The power control apparatus according to claim 1, wherein the operation output ratio output means is provided in an engine control module that controls the engine. In a power control method for controlling power supplied from a battery to an electric drive device,
The current value of the battery is detected, the voltage value of the battery is detected, the operation status of the electric drive device is detected, and the current value, the voltage value, and the operation status are detected by the operation output ratio output means. An electric power control method for outputting an operation output ratio of each electric drive device.

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