JP2017050938A - Vehicle control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle control device which can shorten a standby time from a drive start operation up to a vehicle travelable state.SOLUTION: At a drive start operation of a vehicle, a capacitor of an inverter is charged by a current limit resistor by closing a charging contact point in a state that a positive contact point is opened, and a negative contact point is closed, a voltage Vp of a battery power supply is lowered by a prescribed value ΔVb when a voltage Vc of the capacitor reaches a value which is lower than a voltage Vb of the battery power supply by the prescribed value ΔVb by the charging, the direct supply of a voltage to the inverter from the battery power supply is started by closing the positive contact point after the reduction of the voltage, the charging contact point is opened, the reduction of the voltage is released, and the vehicle is brought into a travelable state.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle control device for a vehicle including a motor driven by a battery power source as a power source.

  A vehicle equipped with a motor driven by a battery power source as a power source, so-called an electric vehicle, includes an inverter to which a battery voltage is supplied in accordance with an operation start operation, and drives the motor by the output of the inverter. The inverter includes a smoothing capacitor, and converts the voltage of the capacitor into an AC voltage by switching and outputs it as driving power to the motor.

  When the operation start operation is performed, the battery voltage is supplied to the inverter via the current limiting resistor, and charging of the capacitor starts. When the voltage of the capacitor rises to a value close to the battery voltage (charging is completed) and there is no concern that a large current flows into the capacitor, the main circuit contact is turned on. When the main circuit contact is turned on, the battery voltage is directly supplied to the inverter and the vehicle is ready to run. Along with this, a ready lamp near the driver's seat is turned on.

JP 2008-199786 A Japanese Patent No. 3560876 JP 2004-120866 A

  The waiting time from when the operation is started until the battery voltage is directly supplied to the inverter and the vehicle is ready to travel may cause irritation and stress to the driver.

  The objective of this invention is providing the vehicle control apparatus which can shorten the waiting time until it will be in a driving | running | working possible state after driving | operation start operation.

  A vehicle control device according to a first aspect of the present invention is a vehicle control device for a vehicle including a motor driven by a battery power source as a power source, and includes a capacitor for smoothing the voltage of the battery power source. Is converted to an AC voltage by switching and output as drive power to the motor, a positive contact for opening and closing a positive current path between the battery power source and the inverter, and the battery power source and the inverter. A negative contact that opens and closes a negative energization path therebetween, a current limiting resistor connected in parallel to the positive contact via a charging contact, and a control means. The control means charges the capacitor via the current limiting resistor by closing the charging contact in a state where the positive contact is opened and the negative contact is closed when the vehicle starts driving operation. When the voltage Vc of the capacitor reaches a value lower by a predetermined value ΔVb than the voltage Vb of the battery power supply due to this charging, the voltage Vb of the battery power supply is reduced by the predetermined value ΔVb. By closing, the direct voltage supply from the battery power source to the inverter is started, the charging contact is opened, and the voltage reduction is released to make the vehicle ready to run.

  The vehicle control device of the invention according to claim 2 limits the battery power supply and the control means of the invention according to claim 1. The battery power supply includes a plurality of assembled batteries formed by connecting a plurality of single cells in series, and these assembled batteries are connected in series to output a DC voltage Vb and reduce the output voltage Vb as necessary. Voltage adjusting means for The control means charges the capacitor via the current limiting resistor by closing the charging contact while the positive contact is opened and the negative contact is closed when the vehicle starts driving. The control means reduces the voltage Vb of the battery power supply by the predetermined value ΔVb by the voltage adjusting means when the voltage Vc of the capacitor reaches the value lower than the voltage Vb of the battery power supply by the charging. To do. The control means closes the positive side contact from the battery power source on condition that the difference ΔV between the voltage Vb of the battery power source after the voltage reduction and the voltage Vc of the capacitor is less than the set value ΔVx. The direct voltage supply to the inverter is started, the charging contact is opened, and the voltage reduction is released to make the vehicle ready to travel.

  The vehicle control device of the invention according to claim 3 limits the voltage adjusting means of the invention according to claim 2. The voltage adjusting means is a plurality of voltage balance circuits connected in parallel to the plurality of single cells, respectively, for adjusting the voltage of each single cell, and includes a discharge resistor and a contact for forming a discharge path, By forming discharge paths through the resistors for a plurality of unit cells, the voltage of each unit cell is reduced.

  The vehicle control device of the invention according to claim 4 limits the control means of the invention according to claim 3. The control means detects the value of the voltage Vb of the battery power supply that can be reduced when a predetermined balance circuit is turned on among the plurality of voltage balance circuits as the predetermined value ΔVb according to the state of the battery power supply.

  The vehicle control device of the invention according to claim 5 limits the control means of the invention according to claim 2. The control means opens the positive side contact, the negative side contact, and the charging contact when there is a driving start operation of the vehicle, and changes the voltage of the capacitor when the charging contact is closed in this state. From this, the presence or absence of welding of the negative contact is diagnosed. The control means opens the charging contact and closes the negative contact when the diagnosis result is normal, and diagnoses the presence or absence of welding of the charging contact from the voltage change of the capacitor at that time. The control means charges the capacitor by closing the charging contact while the positive contact is open and the negative contact is closed when the diagnosis result is normal. The control means reduces the voltage Vb of the battery power supply by the predetermined value ΔVb by the voltage adjusting means when the voltage Vc of the capacitor reaches a value lower than the voltage Vb of the battery power supply by the charging. . The control means closes the positive side contact from the battery power source on condition that the difference ΔV between the voltage Vb of the battery power source after the voltage reduction and the voltage Vc of the capacitor is less than the set value ΔVx. The direct voltage supply to the inverter is started, the charging contact is opened, and the voltage reduction is released to make the vehicle ready to travel. Further, the control means opens the positive contact when the operation of the vehicle is stopped, ends the voltage supply from the battery power supply to the inverter, and the capacitor at the time when the positive contact is opened. The presence or absence of welding of the positive contact is diagnosed from the voltage change of the negative contact, and the negative contact is opened after this diagnosis.

  According to the vehicle control device of the present invention, it is possible to shorten the waiting time from the driving start operation until the vehicle is ready to run.

The block diagram which shows the structure of one Embodiment of this invention. The flowchart which shows the control of the same embodiment. The time chart which shows the change of the capacitor voltage in the embodiment with opening and closing of each contact.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the battery pack 1 includes a battery power source 10, a positive contact (also referred to as a positive main circuit contact) 11a, a negative contact (also referred to as a negative main circuit contact) 12a, a charging contact 13a, a current A limiting resistor 14 and a battery controller (also referred to as a battery ECU) 15 are included.

  The battery power source 10 is formed by connecting a plurality of assembled batteries (also referred to as battery modules) 2 in series, and outputs a DC voltage (referred to as a battery voltage) Vb having a rated value of, for example, 300V. Each assembled battery 2 has a plurality of storage batteries so-called single cells (also referred to as cells) 3a, 3b,... 3n connected in series, and a voltage balance circuit (voltage adjusting means) 4 connected to each of the single cells 3a, 3b,. It is connected in parallel and includes a cell monitor 7 for voltage monitoring. The battery power supply 10 includes a temperature detection unit 8. The temperature detector 8 detects the temperature (referred to as battery temperature) Tb of the battery power supply 10.

  Each of the unit cells 3a, 3b,... 3n of each assembled battery 2 has an internal resistance r. Each voltage balance circuit 4 is for adjusting the individual voltage (cell voltage) Vcell of each of the cells 3a, 3b,... 3n in each assembled battery 2, and is used to form a discharge resistor 5 and a discharge path ( A contact 6a for forming a bypass circuit). The contact 6a is a normally open contact of a switch 6 such as a relay, and is closed (turned on) by energizing the exciting coil 6c in the switch 6, and opened (turned off) by deactivating the exciting coil 6c. The exciting coil 6c is energized when a driving voltage is supplied from the cell monitor 7, and is de-energized when the driving voltage is cut off. While the exciting coil 6c is energized and the contact 6a is closed, a discharge path through the resistor 5 is formed for the single cell, and the cell voltage Vcell gradually decreases.

  Among the voltage balance circuits 4, some voltage balance circuits 4 are selected in advance for voltage reduction for reducing the battery voltage Vb by a predetermined value ΔVb. The predetermined value ΔVb is for determining the charging target value Vbs for the capacitor 21 and is determined according to the rated value of the battery voltage Vb, the capacity of the inverter 20, and the like.

  The cell monitor 7 detects the cell voltages Vcell of the single cells 3a, 3b,... 3n, detects the lowest value and the highest value of each detected cell voltage Vcell, and notifies the battery controller 15 of these detection results. Further, the cell monitor 7 operates energization and deactivation of the excitation coil 6 c in each voltage balance circuit 4 in accordance with a command from the battery controller 15. The temperature detector 8 notifies the battery controller 15 of the detected battery temperature Tb.

  The positive contact (also referred to as positive main circuit contact) 11a is a normally open contact of a switch 11 such as an electromagnetic switch, an electromagnetic contactor, or a relay, and is closed by energizing an exciting coil 11c in the switch 11. (Turned on) and opened (turned off) when the exciting coil 11c is de-energized. Similarly, the negative contact (also referred to as negative main circuit contact) 12a is a normally open contact of the switch 12 such as an electromagnetic switch, an electromagnetic contactor, or a relay, and is closed by energizing the exciting coil 12c in the switch 12. (Turned on) and opened (turned off) when the exciting coil 12c is de-energized. A charging contact (also referred to as a precharge contact) 13a is also a normally open contact of the switch 13 such as an electromagnetic switch, an electromagnetic contactor, or a relay, and is closed (ON) by energizing the exciting coil 13c in the switch 13. And opened (turned off) when the exciting coil 13c is de-energized.

  The excitation coils 11c, 12c, and 13c are connected to the main controller 40 by signal lines, are energized when a drive voltage is supplied from the main controller 40, and are deactivated when the drive voltage is cut off.

  The battery controller 15 detects the voltage (battery voltage) Vb of the battery power supply 10 by calculation based on each cell voltage Vcell notified from the cell monitor 7 of each assembled battery 2, and uses the detected voltage Vb as the detected temperature of the temperature detection unit 8. (Battery temperature) The main controller 40 is notified together with Tb.

  Further, the battery controller 15 monitors the cell voltage Vcell of all the single cells in the battery power supply 10 through the cell monitor 7 of each assembled battery 2, and when a predetermined difference occurs between the cell voltages Vcell, The cell monitor 7 of each assembled battery 2 is instructed to perform voltage adjustment processing for making the other cell voltage Vcell coincide with the lowest value of the voltages Vcell. Upon receiving this instruction, the cell monitor 7 selects a single cell whose cell voltage Vcell is not the above-mentioned minimum value among the cell voltages Vcell in the assembled battery 2, and the cell voltage Vcell of the selected single cell becomes the above-mentioned minimum value. The voltage balance circuit 4 corresponding to the unit cell is turned on (contact 6a is closed) until they match. For example, when the cell voltage Vcell of the single battery 3a is not the lowest value, the battery controller 15 turns on the voltage balance circuit 4 corresponding to the single battery 3a. By this turning on, the electric charge of the unit cell 3a is discharged through the contact 6a and the resistor 5, and the cell voltage Vcell of the unit cell 3a changes in the decreasing direction. When the cell voltage Vcell of the unit cell 3a matches the minimum value, the cell monitor 7 turns off the voltage balance circuit 4 corresponding to the unit cell 3a. In this way, the cell voltage Vcell of all the single cells in the battery power supply 10 is adjusted to the minimum value.

  The positive input terminal of the inverter 20 is connected to the positive terminal (+) of the battery power supply 10 via the positive conduction path P, and the inverter is connected to the negative terminal (−) of the battery power supply 10 via the negative conduction path N. Twenty negative input ends are connected. The positive contact 11a is inserted and connected to the positive energizing path P, and the negative contact 12a is inserted and connected to the negative energizing path N. Furthermore, a current limiting resistor 14 is connected in parallel to the positive contact 11a via a charging contact 13a.

  Inverter 20 includes a capacitor 21, a switching circuit 22, and a voltage detection unit 23. Capacitor 21 smoothes battery voltage Vb supplied from battery power supply 10. The switching circuit 22 includes a plurality of switching elements such as IGBTs, and by switching these IGBTs, the voltage Vc of the capacitor 21 is converted to an AC voltage having a frequency and level according to a command from the main controller 40, and the AC voltage is electrically driven. It is output as drive power to the motor 30 that is the power source of the vehicle. The voltage detector 23 detects the voltage Vc of the capacitor 21. The detection result of the voltage detector 23 is notified to the main controller 40. The motor 30 is, for example, an AC synchronous motor.

  A power switch 41, a brake switch 42, a ready lamp 43, and an abnormality display lamp 44 are connected to the main controller 40. The power switch 41 is operated when starting and ending the operation of the electric vehicle. The brake switch 42 is turned on when the brake operation of the electric vehicle is performed, and is turned off when the brake operation is released. The ready lamp 43 is, for example, a light emitting diode (LED), and is disposed on an instrument panel or the like in the vicinity of the driver's seat. The abnormality display lamp 44 is, for example, a light emitting diode (LED), and is disposed on an instrument panel or the like in the vicinity of the driver's seat, and emits an abnormality such as welding of the positive side contact 11a, the negative side contact 12a, and the charging contact 13a. Inform.

  The main controller 40 is also referred to as a vehicle integrated ECU, and executes various controls related to running of the electric vehicle, and has the following means (1) to (8) as main functions.

  (1) When an operation start operation is performed by simultaneously turning on the power switch 41 and the brake switch 42, the positive side contact 11a, the negative side contact 12a, and the charging contact 13a are all opened, and the charging contact is started from this state (initial state). First control means for diagnosing the presence or absence of welding of the negative contact 12a based on a change in the voltage Vc of the capacitor 21 when 13a is closed.

  (2) When the diagnosis result of the first control means is normal, the charging contact 13a is opened and the negative contact 12a is closed. Based on the change in the voltage Vc of the capacitor 21 at that time, the charging contact 13a Second control means for diagnosing the presence or absence of welding.

  (3) When the diagnosis result of the second control means is normal, the charging contact 13a is closed and the capacitor 21 is charged with the positive contact 11a open and the negative contact 12a closed. Control means.

  (4) The value (reduced value) of the battery voltage Vb that can be reduced when the voltage reduction circuit 4 for voltage reduction is turned on with the start of charging by the third control means is set to the state of the battery power supply 10 (battery voltage). 4th control means which detects (predicts) as actual predetermined value Vb according to Vb, battery temperature Tb, etc.).

  (5) With the start of charging by the third control means, a value (= Vb−ΔVb) lower than the battery voltage Vb by the detected predetermined value ΔVb is set as the charging target value Vbs, and the voltage Vc of the capacitor 21 increases. When the capacitor voltage Vc reaches the charging target value Vbs, fifth control means for turning on the voltage reduction circuit 4 for voltage reduction via the battery controller 15 and thereby reducing the battery voltage Vb by the predetermined value ΔVb.

  (6) The positive contact 11a is closed on condition that the difference ΔV (= Vb−Vc) between the battery voltage Vb after the voltage reduction by the fifth control means and the voltage Vc of the capacitor 21 is less than the set value ΔVx. Thus, direct battery voltage supply from the battery power source 10 to the inverter 20 is started, and the charging contact 13a is opened, and the voltage reduction circuit 4 for voltage reduction is turned off to cancel the voltage reduction. Sixth control means for bringing the vehicle into a travelable state;

  (7) Seventh control means for notifying that the vehicle is in a travelable state by light emission of the ready lamp 43 in accordance with the voltage reduction cancellation by the sixth control means.

  (8) When an operation stop operation is performed by turning on the power switch 41, the voltage of the capacitor 21 at the time when the positive side contact 11a is opened to end the battery voltage supply to the capacitor 21 and the positive side contact 11a is opened. 8th control means which diagnoses the presence or absence of welding of the positive side contact 11a based on the change of Vc, and opens the negative side contact 12a after this diagnosis.

  Note that the fourth control unit (4) specifically sets the value (reduced value) of the battery voltage Vb that can be reduced when the voltage reduction circuit 4 for voltage reduction is turned on to the current battery voltage. (Battery remaining amount) By calculation based on Vb and current battery temperature Tb, or refer to a voltage reduction data table stored in advance based on current battery voltage (battery remaining amount) Vb and current battery temperature Tb. Thus, the actual predetermined value Vb is detected (predicted). The voltage balance circuit 4 for voltage reduction is originally selected to reduce the battery voltage Vb by the predetermined value ΔVb, but the value of the battery voltage Vb that is actually reduced is affected by the state of the battery power supply 10. Considering this point, the actual predetermined value Vb is detected by the fourth control means.

  The voltage reduction data table carries out a test for sequentially checking the value of the battery voltage Vb to be reduced when the voltage balance circuit 4 for voltage reduction is turned on while changing the battery voltage Vb and the battery temperature Tb, and the obtained reduction value Is associated with the battery voltage Vb and the battery temperature Tb, which are parameters, and is stored in the internal memory of the main controller 40.

  Next, the control executed by the main controller 40 and the battery controller 15 will be described with reference to the flowchart of FIG. 2 and the time chart of FIG.

  When there is an operation start operation by simultaneously turning on the power switch 41 and the brake switch 42 (YES in Step S1), the main controller 40 executes a welding diagnosis process for the negative contact 12a and the charging contact 13a (Step S2). .

  In this welding diagnosis process, the main controller 40 sets an initial state in which both the positive contact 11a, the negative contact 12a, and the charging contact 13a are opened (step S2a). Then, the main controller 40 determines whether or not the difference ΔV (= Vb−Vc) between the battery voltage Vb and the voltage Vc of the capacitor 21 is equal to or larger than a set value ΔVs sufficient for welding diagnosis (step S2b). .

  When the difference ΔV is equal to or larger than the set value ΔVs (YES in step S2b), the main controller 40 closes the charging contact 13a (step S2c) and monitors whether the voltage Vc of the capacitor 21 increases (step S2d). .

  When the voltage Vc of the capacitor 21 is increased (NO in step S2d), the main controller 40 opens the charging contact 13a (step S3) and determines that the negative contact 12a is welded. Is notified to the driver by the emission of the abnormality display lamp 44 (step S4). When the voltage Vc of the capacitor 21 does not increase (YES in step S2d), the main controller 40 opens the charging contact 13a based on the determination that the negative contact 12a is not welded (step S2e). The negative contact 12a is closed (step S2f), and it is monitored whether or not the voltage Vc of the capacitor 21 increases (step S2g).

  When the voltage Vc of the capacitor 21 rises (NO in step S2g), the main controller 40 opens the negative contact 12a (step S3) and determines that the charging contact 13a is welded. Is notified to the driver by the emission of the abnormality display lamp 44 (step S4). When the voltage Vc of the capacitor 21 does not increase (YES in step S2g), the main controller 40 ends the welding diagnosis process and proceeds to the next process based on the determination that the charging contact 13a is not welded. .

  As the next processing, the main controller 40 closes the charging contact 13a while the positive contact 11a is open and the negative contact 12a is closed (step S5). When the charging contact 13a is closed, the battery voltage Vb is applied to the capacitor 21 via the current limiting resistor 14, and charging of the capacitor 21 is started. At this time, since the current limiting resistor 14 is interposed in the energization path to the capacitor 21, an excessive inrush current does not flow to the capacitor 21 even when the voltage Vc of the capacitor 21 is close to zero.

  With the start of charging, the main controller 40 changes the value (reduced value) of the battery voltage Vb that can be reduced when the voltage reduction circuit 4 for voltage reduction is turned on to the current battery voltage Vb and the current battery temperature Tb. It is detected (predicted) as the actual predetermined value Vb by calculation based on it or referring to the voltage reduction data table (step S6). Then, the main controller 40 determines a value (= Vb−ΔVb) lower than the battery voltage Vb by the detected predetermined value ΔVb as the charging target value Vbs, and the voltage Vc of the capacitor 21 increases to reach the charging target value Vbs. When this occurs (YES in step S7), the voltage balance circuit 4 for voltage reduction is turned on, thereby reducing the battery voltage Vb by a predetermined value ΔVb (step S8).

  Along with this voltage reduction, the main controller 40 determines whether or not the difference ΔV (= Vb−Vc) between the battery voltage (battery voltage after reduction) Vb and the voltage Vc of the capacitor 21 is less than the set value ΔVx. (Step S9). When the difference ΔV is equal to or larger than the set value ΔVx (NO in step S9), the process waits for the voltage Vc of the capacitor 21 to increase. When the difference ΔV is less than the set value ΔVx (YES in step S9), the main controller 40 determines that there is no concern that an excessive current flows through the capacitor 21 even when the positive side contact 11a is closed. Is closed (step S10). When the positive contact 11a is closed, the charging path for the capacitor 21 is switched from the path via the current limiting resistor 14 to the path not via the current limiting resistor 14. That is, the battery voltage Vb is directly supplied to the capacitor 21.

  Subsequently, the main controller 40 opens the charging contact 13a (step S11) and turns off the voltage reduction circuit 4 for voltage reduction to cancel the voltage reduction of the predetermined value Vb (step S12). Along with the cancellation of this voltage reduction, the voltage Vc of the capacitor 21 increases as a result.

  In the time chart of FIG. 3, the voltage reduction is released after opening the charging contact 13a. However, if the positive side contact 11a is closed, the voltage reduction is released before the charging contact 13a is opened. Alternatively, the voltage reduction may be canceled simultaneously with opening the charging contact 13a.

  With the cancellation of the voltage reduction of the predetermined value Vb, the main controller 40 informs the driver of the so-called ready-on to that effect by the light emission of the ready lamp 43 with the vehicle in a travelable state (step S13). That is, the main controller 40 appropriately executes switching control of the inverter 20 for supplying driving power to the motor 30 according to a driving operation or the like, thereby enabling the vehicle to travel by driving the motor 30.

  When the ready lamp 43 emits light, the voltage Vc of the capacitor 21 is at least equal to or higher than the charge target value Vbs, and the battery voltage Vb is directly supplied to the inverter 20 without passing through the current limiting resistor 14. Therefore, electric power sufficient for driving the motor 30 can be output from the inverter 20.

  Thereafter, when there is an operation stop operation by turning on the power switch 41 (YES in Step S14), the main controller 40 opens the positive contact 11a to end the battery voltage supply to the inverter 20 (Step S15), and A so-called ready-off indicating that the vehicle is not ready to travel is notified to the driver by extinguishing the ready lamp 43 (step S16). Subsequently, the main controller 40 executes a welding diagnosis process for the positive side contact 11a (step S17).

  In this welding diagnosis process, the main controller 40 monitors whether or not the voltage Vc of the capacitor 21 has dropped (step S17a). When the voltage Vc of the capacitor 21 does not decrease (NO in step S17a), the main controller 40 determines that the positive side contact 11a is welded and indicates that an abnormality has occurred by light emission of the abnormality display lamp 44. (Step S17b) and the negative contact 12a is opened (step S18). When the voltage Vc of the capacitor 21 decreases (YES in Step S17a), the main controller 40 opens the negative contact 12a based on the determination that the positive contact 11a is not welded (Step S18).

  As described above, the battery voltage Vb is supplied to the inverter 20 via the current limiting resistor 14 in accordance with the operation start operation, thereby starting charging of the capacitor 21, and the voltage Vc of the capacitor 21 is changed from the battery voltage Vb. When the battery voltage Vb is reduced to the predetermined value ΔVb so that a large current does not flow into the capacitor 21 when the charging target value Vbs is lowered by the predetermined value ΔVb, the battery power source 10 is closed by closing the positive contact 11a in this state. 3 starts the direct battery voltage supply to the inverter 20 and cancels the voltage reduction of the predetermined value ΔVb so that the vehicle can run (ready on), whereby the voltage of the capacitor 21 is shown as shown by a one-dot chain line in FIG. Compared to when the positive contact 11a is turned on after Vc rises to a value close to the rated value of the battery voltage Vb. It can be possible to shorten the time of the state and until. Since the time from the driving start operation until the vehicle is ready to run is shortened, the driver's irritation and stress can be suppressed.

[4] Modification
In the above embodiment, the battery voltage Vb is reduced by the predetermined value Vb by using the voltage balance circuit 4 that is a voltage adjustment means. However, the voltage balance circuit 4 is not limited to the voltage balance circuit 4 as long as it has a similar voltage reduction function. Other devices may be used.

  In addition, the said embodiment and modification are shown as an example and are not intending limiting the range of invention. The novel embodiments and modifications can be implemented in various other forms, and various omissions, rewrites, and changes can be made without departing from the spirit of the invention. In these embodiments and modifications, the scope of the invention is included in the gist, and is included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... Battery pack, 2 ... Assembly battery, 3a-3n ... Single cell, 4 ... Voltage balance circuit, 5 ... Resistor for discharge, 6 ... Switch, 6a ... Contact, 6c ... Excitation coil, 7 ... Cell monitor, 8 DESCRIPTION OF SYMBOLS ... Temperature detection part, 10 ... Battery power supply, 11 ... Switch, 11a ... Positive side contact, 11c ... Excitation coil, 12 ... Switch, 12a ... Negative side contact, 12c ... Excitation coil, 13 ... Switch, 13a ... Charging Contact point, 13c ... excitation coil, 14 ... current limiting resistor, 15 ... battery controller, 20 ... inverter, 21 ... capacitor, 22 ... switching circuit, 30 ... motor, 40 ... main controller, 41 ... power switch, 42 ... Brake switch, 43 ... Ready lamp, 44 ... Abnormal indicator lamp

Claims (5)

A vehicle control device for a vehicle including a motor driven by a battery power source as a power source,
An inverter that includes a capacitor that smoothes the voltage of the battery power supply, converts the voltage of the capacitor into an AC voltage by switching, and outputs the AC power as drive power;
A positive contact for opening and closing a positive current path between the battery power source and the inverter;
A negative contact that opens and closes a negative energization path between the battery power source and the inverter;
A current limiting resistor connected in parallel to the positive contact via a charging contact;
When starting operation of the vehicle, the capacitor is charged via the current limiting resistor by closing the charging contact in a state where the positive contact is opened and the negative contact is closed, and the charging causes the capacitor to When the voltage Vc of the capacitor reaches a value lower than the voltage Vb of the battery power supply by a predetermined value ΔVb, the voltage Vb of the battery power supply is reduced by the predetermined value ΔVb, and the positive side contact is closed after the voltage reduction. Control means for starting direct voltage supply from the battery power source to the inverter and opening the charging contact and releasing the voltage reduction to make the vehicle ready to travel;
A vehicle control device comprising: The battery power source includes a plurality of assembled batteries formed by connecting a plurality of single cells in series, and these assembled batteries are connected in series to output a DC voltage Vb and reduce the output voltage Vb as necessary. Voltage adjusting means for
The control means includes
When starting operation of the vehicle, the capacitor is charged via the current limiting resistor by closing the charging contact in a state where the positive contact is opened and the negative contact is closed,
When the voltage Vc of the capacitor reaches a value lower than the voltage Vb of the battery power supply by the charging, the voltage Vb of the battery power supply is reduced by the predetermined value ΔVb by the voltage adjusting means,
On the condition that the difference ΔV between the voltage Vb of the battery power supply after the voltage reduction and the voltage Vc of the capacitor is less than the set value ΔVx, the battery power supply to the inverter is closed by closing the positive contact. Starting the direct voltage supply and opening the charging contact and releasing the voltage reduction by the voltage adjusting means to make the vehicle ready to travel;
The vehicle control device according to claim 1. The voltage adjusting means is a plurality of voltage balance circuits that are connected in parallel to the plurality of single cells and adjust the voltage of each single cell, and include a discharge resistor and a discharge path forming contact, The vehicle control device according to claim 2, wherein the voltage of each single cell is reduced by forming a discharge path via the resistor for the plurality of single cells. The control means detects, as the predetermined value ΔVb, a value of the voltage Vb of the battery power supply that can be reduced when a predetermined balance circuit is turned on among the plurality of voltage balance circuits, according to the state of the battery power supply. The vehicle control device according to claim 3. The control means includes
When there is a driving start operation of the vehicle, the positive side contact, the negative side contact, and the charging contact are both opened, and the charging side is closed from the voltage change of the capacitor when the charging contact is closed in this state. Diagnose contact welding,
When the diagnosis result is normal, the charging contact is opened and the negative contact is closed, and the presence or absence of the charging contact is diagnosed from the voltage change of the capacitor at that time,
When the diagnosis result is normal, the positive contact is open and the negative contact is closed to close the charging contact and charge the capacitor.
When the voltage Vc of the capacitor reaches a value lower than the voltage Vb of the battery power supply by the charging, the voltage Vb of the battery power supply is reduced by the predetermined value ΔVb by the voltage adjusting means.
On the condition that the difference ΔV between the voltage Vb of the battery power supply after the voltage reduction and the voltage Vc of the capacitor is less than the set value ΔVx, the battery power supply to the inverter is closed by closing the positive contact. Start direct voltage supply and open the charging contact and cancel the voltage reduction by the voltage adjusting means to make the vehicle ready to travel,
When the operation of the vehicle is stopped, the positive contact is opened, the voltage supply from the battery power supply to the inverter is terminated, and the positive voltage is changed from the voltage change of the capacitor when the positive contact is opened. The vehicle control device according to claim 2, wherein the presence or absence of side contact welding is diagnosed, and the negative contact is opened after the diagnosis.

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