JP2005210840A - Controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a controller which can increase a torque at a necessary time without using a step-up circuit. <P>SOLUTION: A motor 11 for running is connected to a motor driver 12, and the motor 11 for the running is driven by the power from the motor driver 12. An accelerator part 21 outputs an accelerator signal to the motor driver 12. The motor driver 12 outputs a torque request signal to a vehicle controller 31 when it is judged that a torque is insufficient. When the vehicle controller 31 receives the torque request signal, the vehicle controller 31 energizes both first and second switching relays 51, 61 of off states to operate on, connects in series both the batteries 41, 42 connected in parallel and doubles the supply voltage. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a controller that controls supply of electric power to a traveling motor of an electric vehicle.

  Conventionally, an electric vehicle is provided with a controller 102 for controlling a traveling motor 101 as shown in FIG.

  The controller 102 includes a motor driver 111 that controls power supply to the traveling motor 101, and a signal such as an accelerator pedal depression amount is input to the motor driver 111 from the accelerator unit 112. The motor driver 111 is supplied with power from a battery 114 mounted on a vehicle via a booster circuit 113, and is configured to supply power to the driving motor 101 in accordance with a signal from the accelerator unit 112. ing.

  The motor driver 111 is configured to output a torque request signal to the booster circuit 113. Thus, the booster circuit 113 is configured to increase the generated torque by boosting the voltage of the battery 114 and driving the travel motor 101 when receiving the torque request signal. Yes.

  However, in such a controller 102, a booster circuit 113 corresponding to the output of the driving motor 101 is required, and a large-capacity booster circuit 113 is required to make an appropriate amount for an electric vehicle as it is.

  The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a controller capable of increasing torque when necessary without using a booster circuit.

  In order to solve the above problems, in the controller of the present invention, in a controller of a vehicle in which a plurality of batteries for supplying electric power to a motor for traveling are mounted, when the torque output from the motor is increased, a parallel connection There is provided connection switching means for switching the connected batteries to series connection and increasing the supply voltage to the motor.

  That is, when the vehicle is traveling, the torque output from the motor may have to be increased, such as during rapid acceleration or traveling on a slope. In this case, the supply voltage to the motor is increased by switching the battery connected in parallel to the serial connection.

  This increases the torque from the motor without using a booster circuit that boosts the voltage from the battery.

  As described above, in the controller of the present invention, it is possible to increase the supply voltage to the motor by switching the batteries connected in parallel to the serial connection and increase the torque output from the motor.

  Therefore, the cost can be reduced and the power consumed by the booster circuit can be reduced as compared with the conventional case where a large-capacity booster circuit corresponding to the output of the driving motor is separately required. it can.

  And even if the size of the motor for traveling is set to the normal traveling rotational speed, the output torque can be increased when necessary, so compared with the case of setting a high torque type large motor. The motor efficiency can be increased and the power consumption can be suppressed. Furthermore, since the motor can be miniaturized, it is advantageous in terms of cost, weight, and vehicle mounting space.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a controller 1 according to the present embodiment, and the controller 1 is mounted on an electric vehicle.

  The controller 1 is a device that controls a traveling motor 11 that drives an electric vehicle, and includes a motor driver 12 that controls power supply to the traveling motor 11. The motor driver 12 is connected to positive and negative power supply terminals 13 and 14 of the traveling motor 11, and is configured such that the traveling motor 11 is driven by electric power supplied from the motor driver 12. Has been.

  An accelerator unit 21 is connected to the motor driver 12, and the accelerator unit 21 is configured to output an accelerator signal such as an accelerator pedal depression amount to the motor driver 12. Thus, an output corresponding to the depression amount of the accelerator pedal is applied from the motor driver 12 to the traveling motor 11.

  The motor driver 12 is connected to the vehicle controller 31, and outputs a torque request signal to the vehicle controller 31 when a decrease in response is detected, for example, acceleration cannot be obtained according to the amount of depression of the accelerator pedal. It is configured as follows.

  The electric vehicle includes a first battery 41 and a second battery 42. A negative terminal of the first battery 41 is connected to the vehicle controller 31 via a ground line 43, and a ground output line 44 from the vehicle controller 31 is connected to the motor driver 12. A power supply line 45 is connected to the plus terminal of the second battery 42, and the power supply line 45 is connected to the motor driver 12.

  The positive terminal of the first battery 41 is connected to the common terminal 52 of the first switching relay 51 that is on / off controlled by the vehicle controller 31, and the common terminal 52 is connected when the first switching relay 51 is not energized. The first contact 53 is connected to the power supply line 45 connected to the plus terminal of the second battery 42.

  The minus terminal of the second battery 42 is connected to a common terminal 62 of a second switching relay 61 that is on / off controlled by the vehicle controller 31, and the common terminal 62 is connected when the second switching relay 61 is not energized. The first contact 63 is connected to the ground line 43 connected to the negative terminal of the first battery 41.

  The second contact 71 connected to the common terminal 62 of the second switching relay 61 when energized is connected to the second contact 72 connected to the common terminal 52 of the first switching relay 51 when energized. The first battery 41 and the second battery 42 are configured to be connected in parallel when the switching relays 51 and 61 are turned off. In addition, when the both switching relays 51 and 61 are energized, the positive terminal of the first battery 41 is connected to the negative terminal of the second battery 42 via the first and second switching relays 51 and 61. The first battery 41 and the second battery 42 are connected in series.

  The overall operation of the controller of the present embodiment according to the above configuration will be described with reference to the flowchart shown in FIG.

  That is, when the accelerator pedal is depressed, an accelerator signal corresponding to the amount of depression of the accelerator pedal is output from the accelerator unit 21 to the motor driver 12, and the motor driver 12 that has received the accelerator signal receives an accelerator request. It is determined that there is (S1). At this time, the motor driver 12 applies an output corresponding to the accelerator signal to the traveling motor 11, and determines that the torque is insufficient when the response decreases such that acceleration corresponding to the accelerator signal cannot be obtained (S2), A torque request signal is output to the vehicle controller 31.

  Upon receiving this torque request signal, the vehicle controller 31 energizes the first and second switching relays 51 and 61 to turn them on, and switches the first and second batteries 41 and 42 connected in parallel to the series connection ( S3). On the other hand, when the vehicle controller 31 does not receive the torque request signal from the vehicle controller 31, the first and second switching relays 51 and 61 are turned off and turned off, and the parallel setting set in the normal state is performed. The connection is continued (S4).

  As described above, when the torque output from the traveling motor 11 is to be increased during traveling of the vehicle, such as during rapid acceleration or traveling on a slope, the first and second batteries 41 and 42 connected in parallel are connected. By switching to the serial connection, the supply voltage applied to the traveling motor 11 via the motor driver 12 can be doubled. Thus, the torque from the traveling motor 11 can be increased without using a booster circuit that boosts the voltages from the batteries 41 and 42.

  Therefore, it is possible to reduce the cost and reduce the power consumed by the booster circuit as compared with the conventional case where a large-capacity booster circuit corresponding to the output of the traveling motor 11 is separately required. it can.

  And even if the size of the traveling motor 11 is set to the normal traveling rotational speed, the output torque can be increased when necessary, so compared with the case where a high-torque large motor is set in advance. The motor efficiency can be increased and the power consumption can be suppressed. Furthermore, since the traveling motor 11 can be reduced in size, it is advantageous in terms of cost, weight, and vehicle mounting space.

It is a block diagram which shows one embodiment of this invention. It is a flowchart which shows the operation | movement of the embodiment. It is a block diagram which shows the conventional controller.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Controller 11 Traveling motor 41 1st battery 42 2nd battery 51 1st switching relay 61 2nd switching relay

Claims (1)

In a vehicle controller equipped with a plurality of batteries for supplying electric power to a motor for traveling,
A controller comprising connection switching means for increasing the supply voltage to the motor by switching the batteries connected in parallel to a serial connection when increasing the torque output from the motor.

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