JP2005274323A - Travel condition simulator for vehicle mounted with drive motor, and method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a loading device capable of simulating a vehicle travel condition near to that of an actual vehicle by absorbing a driving output from a driving unit, in a performance test of the vehicle. <P>SOLUTION: A travel simulator 60 for controlling load absorbing motors 50a, 50b calculates a load torque to be generated in the load absorbing motors 50a, 50b, while taking a regenerative torque generated in a motor generator 20 into account, when simulating a braking condition of the vehicle, and controls the load absorbing motors 50a, 50b to generate the calculated load torque, in a test system for simulating the vehicle travel condition by absorbing the driving output from an engine 10 or the motor generator 20 by the load absorbing motors 50a, 50b connected directly to a driving shaft 40, without mounting a braking system mounted on the actual vehicle. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention provides a load device that virtually generates a braking torque and a running resistance torque in accordance with specified driving conditions in order to simulate a vehicle running state in performance inspection of a vehicle equipped with a drive motor as a drive source. The present invention relates to a load device control system to be controlled.

  As an inspection device for performing a performance test of a vehicle, for example, there is an inspection device disclosed in Patent Document 1. In the apparatus of Patent Document 1, each performance test can be performed in a state where the engine and the drive train are combined. However, in a performance test of an electric vehicle or a hybrid vehicle equipped with a motor / generator as a drive source, it is directly connected to a drive wheel without mounting a brake system mounted on an actual vehicle as shown in Patent Document 1. The inspection apparatus that simulates the running state of the vehicle by the load absorption motor absorbing the drive output of the engine or motor / generator has the following problems.

  That is, a motor / generator mounted as a drive source not only generates drive torque but also generates regenerative torque when the vehicle is in a braking state. However, in the conventional inspection device, when the load absorption motor simulates the braking state of the vehicle, the mechanical brake torque and the running resistance torque that should be generated in the brake system are not considered without considering the regenerative torque generated in the motor / generator. It was generated in a simulated manner. Therefore, an error corresponding to the regenerative torque generated by the motor / generator may occur in a simulated vehicle running state realized by such an inspection apparatus.

JP-A-11-125583 Japanese Patent Laid-Open No. 08-334439 JP 2000-35380 A JP 2000-97811 A

  An object of the present invention is to provide a vehicle running state closer to an actual vehicle by a load device that simulates a vehicle running state by absorbing a drive output output from a vehicle drive source in a vehicle performance inspection. To do.

  In order to perform a performance test of a vehicle equipped with a drive motor as a drive source, the running state simulation device according to the present invention controls a load device connected to an output shaft that transmits an output from the drive motor, and is designated. A driving state simulator that simulates the driving state of the vehicle by generating a load torque corresponding to the driving condition with respect to the output shaft, and a target generated torque to be generated by the drive motor is designated as a specified driving condition. A target generated torque calculating means for calculating the torque according to the output, a torque command output means for outputting a torque command indicating an instruction for generating the calculated target generated torque to a drive motor control device for controlling the drive motor, and a load device for generating the torque command. Load torque calculating means for calculating a load torque to be performed according to a specified operating condition, and load control for controlling the load device based on the calculated load torque And when the target generated torque indicated by the torque command is a regenerative torque, the load torque calculating means subtracts the regenerative torque and calculates a load torque to be generated under the operating conditions. Features.

  According to the present invention, when the target generated torque indicated by the torque command output by the torque command output means indicates the regenerative torque, the load torque calculating means should subtract the regenerative torque and generate it under the operating conditions. Calculate the load torque. Thus, for example, without installing a brake system mounted on an actual vehicle, each load absorption motor as a load device directly connected to each drive wheel absorbs the drive output of the engine or motor / generator, thereby driving the vehicle. When the vehicle braking state is simulated in the inspection device that simulates the braking torque, the load control device that controls each load absorbing motor should consider the regenerative torque generated by the motor / generator and should be generated by the load absorbing motor. And the load absorption motor is controlled to generate the calculated braking torque. Therefore, it is possible to provide a vehicle running state that is closer to a real vehicle than the conventional inspection device of the same type.

  According to one aspect of the traveling state simulation device according to the present invention, the execution regenerative torque acquisition means for acquiring the execution regenerative torque generated by the drive motor measured by the torque measurement device, the acquired execution regenerative torque, and the torque Difference calculating means for calculating a difference from the target generated torque when the measuring device measures the effective regenerative torque, and the calculated difference between the operating condition specified when the torque measuring device measured the effective regenerative torque and Difference generating means for storing in association with each other, and when the target generated torque indicated in the torque command is regenerative torque, the target generated torque calculating means has the same operating condition as that specified when calculating the target generated torque. The difference registered in association with the operating condition is acquired from the difference storage means, and the target generated torque correction calculated according to the specified operating condition is the difference. And performing based on.

  According to the present invention, when the target generated torque indicated in the torque command is the regenerative torque, the target generated torque calculation means is registered in association with the same operating condition as the operating condition specified when calculating the target generated torque. The obtained difference is acquired from the difference storage means, and the target generated torque calculated according to the designated operating condition is corrected based on the difference. As a result, it is possible to correct an error that occurs between the execution regenerative torque generated by the drive motor and the target generated torque that is actually desired to be generated, thereby realizing a more accurate simulation of the running state of the vehicle.

  Embodiments of the present invention (hereinafter referred to as embodiments) will be described with reference to the drawings. FIG. 1 shows a test apparatus for a hybrid vehicle in the present embodiment. In the hybrid vehicle test apparatus, an engine 10, a motor / generator 20, a power distribution mechanism 30, and a drive shaft 40 are connected as test specimens. Under the control of the ECU 90, the drive output output from the engine 10 or the motor / generator 20 is transmitted to the drive shaft 40 via the power distribution mechanism 30. Furthermore, load absorption motors 50a and 50b are connected to both ends of the drive shaft 40 as load devices. The load absorption motors 50a and 50b are load devices that virtually generate a braking torque and a running resistance torque for the drive shaft 40 in order to simulate a vehicle running state. As described above, in the load absorption motors 50a and 50b, by virtually generating the braking torque and the running resistance torque, the brake system mounted on the actual vehicle is further mounted without actually driving the vehicle. Therefore, it is possible to create a vehicle running state in a simulated manner and perform various performance tests of the vehicle.

  The travel simulation device 60 calculates load torque values such as braking torque and travel resistance torque that are virtually generated based on the designated operating conditions, and causes the load absorption motors 50a and 50b to generate the load torque. It is a device to control. Furthermore, the traveling simulation device 60 outputs a control command to the ECU 90 so that each sample body performs an operation according to the designated operating condition. Based on this control command, the ECU 90 controls the engine 10 and the motor / generator 20 to generate driving torque, or controls the motor / generator 20 to generate regenerative torque.

  What is characteristic in the present embodiment is that the travel simulation device 60 calculates the value of the load torque generated by the load absorption motors 50a and 50b in consideration of the value of the regenerative torque generated by the motor / generator 20. . As a result, it is possible to provide a vehicle running state that is closer to a real vehicle than the conventional test apparatus of the same type. Details will be described later.

  The sensors 70a and 70b are detectors that measure the rotational speed and torque of the wheel end face. Measurement values measured by the sensors 70 a and 70 b are output to the travel simulation device 60. The traveling simulation device 60 determines whether or not the specimen is operating according to the designated operating conditions based on the values measured by the sensors 70a and 70b, and if necessary, the load absorbing motor. Or a correction control command is output to the ECU 90. The ECU 90 receives the correction control command and corrects and controls the engine 10 and the motor / generator 20.

  The operation terminal 80 is a device that designates driving conditions in accordance with inspection items for vehicle performance inspection and provides the designated driving conditions to the traveling simulation device 60. Here, the driving condition defines a temporal change in the vehicle speed, and is roughly classified into an acceleration state, a constant speed state, a deceleration state, and an idling state.

  For example, when the vehicle performance inspection is performed based on the 10.15 mode defined as the so-called fuel consumption measurement mode, it is performed under the driving conditions as shown in FIGS. 2A and 2B. In FIG. 2A, the operation condition of the operation mode 1 is an idling state, and is a condition that the state in which the drive device is operated without load is continued for 20 seconds. Moreover, the driving condition of the driving mode 2 is an acceleration state, and is a condition of accelerating to 20 km / h in 7 seconds after starting. Moreover, the driving condition of the driving mode 3 is a constant speed state, and is a condition that the speed of 20 km / h is maintained for 15 seconds. Further, the operation condition of the operation mode 4 is a condition that the vehicle is decelerated and stops at a speed of 20 km / h in 7 seconds. Each operation mode defined as described above is temporally changed as shown in FIG. 3, and the vehicle performance inspection in the 10.15 mode is performed. For example, the first operation pattern can be realized by sequentially executing the operation conditions defined in each operation mode from the operation mode 1 to the operation mode 10 in order.

  The operation terminal 80 outputs an operation mode group in which operation modes are arranged according to a desired operation pattern to the travel simulation device 60. Then, the traveling simulation device 60 selects the operation mode in order from the input operation mode group, and outputs the load absorbing motors 50a and 50b so that the sample body operates under the operation condition according to the operation mode. Control torque. The travel simulation device 60 outputs a control command corresponding to the driving condition to the ECU 90, and the ECU 90 controls the engine 10, the motor / generator 20, and the power distribution mechanism 30 according to the control command.

  Next, an operation flow for controlling the load absorption motors 50a and 50b based on the operation mode group input from the operation terminal 80 by the traveling simulation device 60 will be described with reference to the flowchart shown in FIG.

  First, the traveling simulation device 60 acquires the operation mode group (1 to N) from the operation terminal 80 (S101). The driving mode group (1 to N) is a set of driving modes, and information for operating the vehicle under driving conditions corresponding to each driving mode in order from driving mode 1 to driving mode N is shown. Refers to data. In the operation mode group, for example, information as shown in FIGS. 2A and 2B is shown, and the operation conditions are defined for each operation mode. When the driving simulation device 60 acquires the operation mode group (1 to N), it initializes the counter n to “1” (S102). Subsequently, an operation condition of the operation mode n (that is, the operation mode 1 at first) is selected from the operation mode group (S103), and a running resistance torque is calculated based on the selected operation condition (S104). Furthermore, the traveling simulation device 60 determines whether or not the selected operating condition is a driving condition in a deceleration state (S105).

  If the result of determination in S105 is that the vehicle is not in a deceleration state, that is, if the selected operating condition is an acceleration state, a constant speed state, or an idling state, the traveling simulation device 60 uses the load absorption motor load torque. The running resistance torque calculated earlier is assigned (S106). Furthermore, the traveling simulation device 60 calculates the accelerator opening based on the selected operating condition (S107). Then, a control command indicating the calculated accelerator opening is output to the ECU 90, and the load absorbing motors 50a and 50b are controlled so as to obtain the calculated load torque (S108). In response to this control command, the ECU 90 controls the engine 10, the motor / generator 20, and the power distribution mechanism 30 to realize an acceleration state, a constant speed state, and an idling state according to operating conditions.

  On the other hand, if the result of determination in S105 is that the vehicle is in a deceleration state, traveling simulation device 60 calculates target braking torque and regenerative torque based on the selected operating conditions (S109). Then, the calculated target control torque and the previously calculated running resistance torque are added, and a value obtained by subtracting the regenerative torque from the added value is assigned as the load torque of the load absorbing motor (S110). Then, a control command indicating the calculated value of the regenerative torque is output to the ECU 90, and the load absorbing motors 50a and 50b are controlled so as to achieve the calculated load torque (S111). The ECU 90 receives this control command and controls the motor / generator 20 so as to generate the regenerative torque indicated by the control command.

  After the simulation running in the operation mode n is completed, the running simulation device 60 increments the counter n (S112), and determines whether the counter n matches N (S113). Thereby, based on all the operation modes contained in the acquired operation mode group, it is determined whether the test piece was operated and the desired performance test was performed. If the result of determination in S113 is not “n = N”, it is determined that there is an operation mode that has not yet been executed, and the operations after S103 are repeatedly executed. In the case of “n = N”, based on all the operation modes included in the acquired operation mode group, it is determined that the test piece is operated and the desired performance inspection is performed, and the test is finished. To do.

  Note that the ratio of torque distribution generated by the load absorption motors 50a and 50b in S108 and S111 may be 50:50, but the ratio of torque distribution may be changed according to the inspection item.

  In addition, an error may occur between the effective regenerative torque that is actually generated by the motor / generator 20 under the control of the ECU 90 and the target regenerative torque that is actually generated by the motor / generator 20. Therefore, when the travel simulation device 60 calculates the regenerative torque in S109 of FIG. 4, the error may be corrected as follows.

  That is, the ECU 90 measures the effective regenerative torque actually generated by the motor / generator 20. Then, the travel simulation device 60 acquires the measured execution regenerative torque, and obtains the difference between the execution regenerative torque and the regenerative torque indicated in the control command output under the operation conditions at that time. The traveling simulation device 60 registers the difference in the built-in memory in association with the driving condition. Then, when calculating the regenerative torque in S109, the traveling simulation device 60 takes out the difference stored in association with the selected operation condition from the memory, corrects the regenerative torque based on the difference, and regenerates indicated in the control command. Calculate the torque. For example, if the effective regenerative torque is smaller than the target regenerative torque, the travel simulation device 60 calculates a regenerative torque by performing a correction to increase the value by the difference, and indicates the corrected regenerative torque in the control command to the ECU 90. Output. As a result, it is possible to correct an error between the target regenerative torque to be generated by the motor / generator 20 based on each operation condition and the actually generated regenerative torque.

  As described above, according to the present embodiment, the load absorption motor directly connected to the drive shaft absorbs the drive output of the engine and the motor / generator without mounting the brake system mounted on the actual vehicle, thereby In the simulated test system, when simulating the braking state of the vehicle, the vehicle load control device that controls the load absorption motor determines the load torque to be generated by the load absorption motor in consideration of the regenerative torque generated by the motor / generator. The load absorption motor is controlled so that the calculated load torque is generated. Therefore, it is possible to provide a vehicle running state that is closer to a real vehicle than a conventional test device of the same type.

  In the present embodiment, a hybrid vehicle has been described as an example of a specimen. However, the present invention can also be applied to a vehicle that generates regenerative torque in a braking state, such as an electric vehicle.

It is a figure which shows the system configuration | structure of the test apparatus for hybrid vehicles in this embodiment. It is an example of the driving | running pattern performed in this embodiment. It is an example of the driving | running pattern performed in this embodiment. As an example of the driving pattern executed in this embodiment, the horizontal axis represents time (s) and the vertical axis represents vehicle speed (km / h). It is a flowchart figure which shows the operation | movement flow in which the driving | running | working simulation apparatus 60 in this embodiment controls load absorption motor 50a, 50b.

Explanation of symbols

  10 engine, 20 motor generator, 30 power distribution mechanism, 40 drive shaft, 50a, 50b load absorption motor, 60 travel simulation device, 70a, 70b sensor, 80 operation terminal, 90 ECU.

Claims (4)

In order to perform a performance test of a vehicle equipped with a drive motor as a drive source, the load device connected to the output shaft that transmits the output from the drive motor is controlled, and the load torque corresponding to the specified operating condition is output. A driving state simulation device that generates a shaft and simulates the driving state of the vehicle,
Target generated torque calculating means for calculating a target generated torque to be generated by the drive motor in accordance with designated operating conditions;
A torque command output means for outputting a torque command indicating a calculated target generation torque generation instruction to a drive motor control device for controlling the drive motor;
Load torque calculating means for calculating a load torque to be generated by the load device according to a specified operating condition;
Load control means for controlling the load device based on the calculated load torque;
With
The load torque calculating means includes
When the target generated torque indicated by the torque command is a regenerative torque, a running torque simulator that calculates a load torque to be generated under the operating condition by subtracting the regenerative torque. In the running state simulation device according to claim 1,
Execution regenerative torque acquisition means for acquiring execution regenerative torque generated by the drive motor measured by the torque measuring device;
A difference calculating means for calculating a difference between the acquired execution regenerative torque and a target generated torque when the torque measuring device measures the execution regenerative torque;
Difference storage means for storing the calculated difference in association with the operating condition specified when the torque measuring device measured the execution regenerative torque;
With
The target generated torque calculating means includes
When the target generated torque indicated in the torque command is a regenerative torque, a difference registered in association with the same operating condition as the operating condition specified when calculating the target generated torque is acquired from the difference storage means and specified. A running state simulation device characterized in that correction of a target generation torque calculated in accordance with a determined driving condition is performed based on the difference. In order to perform a performance test of a vehicle equipped with a drive motor as a drive source, the load device connected to the output shaft that transmits the output from the drive motor is controlled, and the load torque corresponding to the specified operating condition is output. A driving state simulation method for generating a shaft and simulating the driving state of the electric vehicle,
A torque command output step of outputting a torque command corresponding to a specified operating condition to a drive motor control device that controls the drive motor based on a torque command indicating an instruction to generate a drive torque or a regenerative torque;
A load torque calculating step of calculating a load torque to be generated by the load device in accordance with a specified operating condition;
A load control step of controlling the load device based on the calculated load torque;
Including
In the load torque calculation step,
When the torque command output in the torque command output step indicates regenerative torque, the load torque to be generated under the operating condition is calculated by subtracting the regenerative torque, and the running state simulation method. In the running state simulation method according to claim 3,
An execution regenerative torque acquisition step of acquiring an execution regenerative torque generated by the drive motor measured by the torque measuring device;
A difference calculating step of calculating a difference between the acquired execution regenerative torque and a target generated torque when the torque measuring device measures the execution regenerative torque;
A difference registration step of registering the calculated difference in the difference storage device in association with the operation condition specified when the torque measurement device measured the execution regenerative torque;
Including
The target generated torque calculation step includes:
When the target generated torque indicated in the torque command is a regenerative torque, a difference registered in association with the same operating condition as the operating condition specified when calculating the target generated torque is acquired from the difference storage device and specified. A running state simulation method characterized in that a target generated torque calculated in accordance with the determined driving condition is corrected based on the difference.

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