JP2020044919A - Travel control device of hybrid vehicle - Google Patents

Abstract

To provide a travel control device of a hybrid vehicle which can achieve stable travel restriction.SOLUTION: A travel control device of a hybrid vehicle includes: an abnormality detection part which detects abnormality of a program recorded in an engine control part for controlling operation of an engine in the hybrid vehicle having an engine and a motor as drive force sources; a comparison part which compares a request drive force from a driver of the hybrid vehicle and a torque upper limit value of the motor when the abnormality of the program is detected by the abnormality detection part when first travel, in which both of the engine and motor are the drive force sources in the hybrid vehicle, is performed; and a stop control part which controls a stop timing of the engine after the abnormality of the program is detected in response to a comparison result of the request drive force and the torque upper limit value by the comparison part.SELECTED DRAWING: Figure 3

Description

  The present disclosure relates to a travel control device for a hybrid vehicle.

  2. Description of the Related Art In recent years, hybrid electric vehicles (HEVs) have been widely put into practical use in which a fuel consumption rate (fuel efficiency) of a vehicle is effectively improved by using both an engine and an electric motor (for example, see Patents). Reference 1).

JP 2017-152762 A

  By the way, in such a hybrid vehicle (hybrid vehicle), it is generally required to realize a stable travel restriction. It is desirable to provide a travel control device for a hybrid vehicle that can realize stable travel restriction.

  A traveling control device for a hybrid vehicle according to an embodiment of the present disclosure detects an abnormality in a program recorded in an engine control unit that controls an operation of an engine in a hybrid vehicle having an engine and a motor as driving power sources. The detection unit and the first vehicle running in the hybrid vehicle using both the engine and the motor as a driving force source. When an abnormality in the program is detected by the abnormality detection unit, a driver of the hybrid vehicle receives an instruction. A comparison unit that compares the required driving force with the torque upper limit value of the motor, and, based on a comparison result between the required driving force and the torque upper limit value in the comparison unit, determines a stop timing of the engine after the abnormality of the program is detected. And a stop control unit for controlling.

  According to the travel control device for a hybrid vehicle according to an embodiment of the present disclosure, stable travel restriction can be realized.

1 is a block diagram illustrating a schematic configuration example of a hybrid vehicle including a traveling control device according to an embodiment of the present disclosure. 5 is a flowchart illustrating an example of a travel control process (travel restriction process) according to the embodiment. FIG. 9 is a timing chart illustrating an example (a specific application example) of the travel restriction process according to the embodiment.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The description will be made in the following order.
1. Embodiment (example of engine stop timing control after program abnormality detection)
2. Modified example

<1. Embodiment>
[Schematic configuration]
FIG. 1 is a block diagram illustrating a schematic configuration example of a hybrid vehicle (HEV1) including a travel control device (an engine control unit 132 described later) according to an embodiment of the present disclosure.

  As shown in FIG. 1, the HEV 1 mainly includes a driving force source 10, a battery 11, an accelerator opening sensor 12, and a control unit 13. The HEV 1 corresponds to a specific example of “hybrid vehicle” in the present disclosure.

(A. Driving force source 10)
As the driving force source 10, in the HEV 1, as shown in FIG. 1, an engine 10a (internal combustion engine) and a motor 10b (electric motor) are provided. That is, the HEV 1 is configured as a hybrid vehicle having the engine 10a and the motor 10b as the driving force source 10.

  Therefore, the HEV 1 includes a hybrid drive using both the engine 10a and the motor 10b as a drive power source, an engine drive using only the engine 10a as a drive power source, and a motor drive using only the motor as a drive power source. Three types of traveling modes are provided. These three types of traveling modes are switched and used at any time according to the traveling conditions of the HEV 1 and the like.

  In addition, among these traveling modes, hybrid traveling corresponds to one specific example of “first traveling” in the present disclosure, and motor traveling corresponds to one specific example of “second traveling” in the present disclosure. .

(B. Battery 11)
The battery 11 stores power used in the HEV 1 and is configured using various secondary batteries such as a lithium ion battery. The battery 11 stores, for example, regenerative power supplied from the motor 10b in addition to power (charging power) obtained by charging the HEV 1 from outside.

(C. Accelerator opening sensor 12)
The accelerator opening sensor 12 is a sensor that detects the accelerator opening Pa (the amount of depression of the accelerator pedal by the driver) corresponding to the driving force of the HEV1 required by the driver of the HEV1. The accelerator opening Pa detected by the accelerator opening sensor 12 in this manner is output to an engine control unit 132, which will be described later, in the control unit 13 (see FIG. 1).

  Here, such accelerator opening Pa corresponds to a specific example of “required driving force from a driver of a hybrid vehicle” in the present disclosure.

(D. Control Unit 13)
The control unit 13 is a part that performs overall control of various operations in the HEV 1 and performs various arithmetic processes. Specifically, the control unit 13 includes a microprocessor for performing calculations, a ROM (Read Only Memory) for storing a program for causing the microprocessor to execute each process, and a RAM (Read Only Memory) for storing various data such as calculation results. A random access memory (RAM), a backup RAM holding the stored contents, an input / output I / F (Interface), and the like.

  Such a control unit 13 includes an information acquisition unit 131, an engine control unit 132, and a motor control unit 133 in the example illustrated in FIG. Note that the engine control unit 132 corresponds to a specific example of “travel control device” in the present disclosure.

(D-1. Information acquisition unit 131)
The information acquisition unit 131 acquires various types of external information Ie from outside the HEV 1 (for example, an external server or the like) via communication (wireless or wired communication), as shown in FIG. 1, for example. Such external information Ie includes, for example, software information such as a program 132a to be described later, which is used in the engine control unit 132 described below (see FIG. 1).

(D-2. Engine control unit 132)
The engine control unit 132 controls various operations in the engine 10a (see FIG. 1). That is, the engine control unit 132 is a part that operates as a so-called “ECU (Engine Control Unit)”. In the example shown in FIG. 1, such an engine control unit 132 has a program (software) 132a, an abnormality detection unit 132b, a comparison unit 132c, and a stop control unit 132d.

  The program 132a is recorded in the engine control unit 132, and functions as a program for executing various operations (control operation of the engine 10a) in the engine control unit 132. The program 132a is, for example, obtained from the outside of the HEV 1 via communication (by the information obtaining unit 131) as described above. That is, the program 132a is a program acquired using, for example, so-called OTA (Over The Air).

  The abnormality detection unit 132b detects an abnormality in the program 132a. Specifically, the abnormality detection unit 132b detects, for example, unauthorized rewriting of the program 132a via communication from outside the HEV 1 as such an abnormality of the program 132a.

  The comparison unit 132c is configured to perform the operation when the abnormality detection unit 132b detects an abnormality in the program 132a while the HEV 1 performs traveling using both the engine 10a and the motor 10b as a driving force source (the hybrid traveling described above). The following comparison is made. That is, in such a case, the comparing unit 132c determines the required driving force from the driver of the HEV1 (the accelerator opening Pa detected by the accelerator opening sensor 12 described above), the torque upper limit value Tmax of the motor 10b, Are to be compared. The details of the comparison process in the comparison unit 132c will be described later (see FIGS. 2 and 3).

  The stop control unit 132d stops the engine 10a after detecting an abnormality in the program 132a in accordance with the result of the above-described comparison process (comparison result between the accelerator opening Pa and the torque upper limit value Tmax) in the comparison unit 132c. It controls the timing. The details of the control processing in the stop control unit 132d will be described later (see FIGS. 2 and 3).

(D-3. Motor control unit 133)
The motor control unit 133 controls various operations of the motor 10b (see FIG. 1). Specifically, the motor control unit 133 controls, for example, a driving operation of the wheels of the HEV 1 by the motor 10b, a regenerative operation by the motor 10b, and the like.

[Operation and Action / Effect]
Next, the operation, operation, and effect of the HEV 1 according to the present embodiment will be described.

(A. Restriction on running after detecting abnormality of program in ECU)
First, a description will be given of the subsequent running limitation (running distance limitation) of the hybrid vehicle when, for example, the above-described abnormality of the program is detected in the engine control unit (ECU) of the general hybrid vehicle.

  First, when such an abnormality of the program is detected in the ECU, a control method of immediately stopping the engine of the hybrid vehicle (switching immediately from the hybrid running to the motor running described above) is considered (comparative example). ).

  However, as in this comparative example, if the engine is immediately stopped (immediately switched from hybrid running to motor running) after the abnormality detection of the program, the vehicle in the hybrid vehicle is caused by the immediate switching control of the driving force source. Behavior may be disturbed. Therefore, in this comparative example, if an abnormality in the program in the ECU is detected during hybrid traveling, it becomes difficult to stably restrict traveling.

(B. Travel restriction processing of the present embodiment)
Therefore, in the present embodiment, when an abnormality is detected in the program 132a of the engine control unit 132 during traveling of the HEV1, a traveling control process (a traveling restriction process) of the HEV1 is performed by using a method described in detail below. I have to.

  Hereinafter, with reference to FIGS. 2 and 3 in addition to FIG. 1, an example of a traveling restriction process in engine control unit 132 during traveling of HEV 1 according to the present embodiment (during traveling by hybrid traveling described above). , Will be described in detail.

  FIG. 2 is a flowchart illustrating an example of such a travel restriction process according to the present embodiment. FIG. 3 is a timing chart showing an example (a specific application example) of the traveling restriction processing according to the present embodiment along time (elapsed time during traveling of the HEV 1). It is. In addition, the vertical axis | shaft shown in FIG. 3 has shown the driving force (drive force by the engine 10a and the motor 10b) in HEV1.

  In the series of processes illustrated in FIG. 2, first, the abnormality detection unit 132b determines whether there is an abnormality in the program 132a (for example, the above-described unauthorized rewriting of the program 132a) (step S11 in FIG. 2). ). Here, when it is determined that there is no abnormality in the program 132a (step S11: N), the determination in step S11 is performed again.

  On the other hand, when it is determined that there is an abnormality in the program 132a (step S11: Y), the comparing unit 132c then compares the required driving force (accelerator opening Pa) with the torque upper limit value Tmax of the motor 10b. A comparison of the magnitude relation is made. Specifically, the comparing unit 132c determines whether or not the accelerator opening Pa is equal to or less than the torque upper limit value Tmax (whether or not Pa ≦ Tmax is satisfied) (step S12).

  Here, when the comparison result that the accelerator opening Pa is larger than the torque upper limit value Tmax (Pa> Tmax) is obtained (step S12: N), the following is performed. That is, in this case, the stop control unit 132d performs control so that hybrid running (running with the engine 10a and the motor 10b) is continued in the HEV 1 without stopping the engine 10a (step S13). After that, the process returns to step S12 again.

  On the other hand, when the comparison result that the accelerator opening Pa is equal to or less than the torque upper limit value Tmax (Pa ≦ Tmax) is obtained (step S12: Y), the following is performed. That is, in this case, the stop control unit 132d controls the HEV 1 so as to switch from hybrid running to motor running (running only with the motor 10b) by stopping the engine 10a (step S14). That is, the engine 10a is stopped in a state where the driving force of the HEV 1 can be supplemented only by the motor 10b, and the driving is forcibly switched to the running only by the motor 10b.

  Further, as shown in parentheses in step S14, after the engine 10a is stopped in this way and the hybrid traveling is switched to the motor traveling, the details will be described later with reference to FIG. Restart is prohibited.

  This is the end of the series of processes (running restriction process) shown in FIG.

  Subsequently, with reference to FIG. 3, a specific application example in such a travel restriction process shown in FIG. 2 will be described.

  In the application example shown in FIG. 3, when the abnormality of the program 132a is detected as described above during the hybrid running (running with the engine 10a and the motor 10b) in the HEV 1 (timing t1 in FIG. 3), It looks like this:

  That is, at this stage, as shown in FIG. 3, the required driving force (accelerator opening Pa) is still larger than the torque upper limit value Tmax of the motor 10b (Pa> Tmax). Therefore, for example, unlike the comparative example described above, the hybrid traveling is continued even after the timing t1 when the abnormality of the program 132a is detected.

  Then, at the timing when the accelerator opening Pa becomes equal to or less than the torque upper limit value Tmax (Pa ≦ Tmax) (timing t2 in FIG. 3), the engine 10a is stopped, and the hybrid traveling is switched to the motor traveling (traveling only with the motor 10b). Will be switched.

  After the engine 10a is stopped in this way and the mode is switched from the hybrid running to the motor running, the following occurs. That is, for example, even when the accelerator opening Pa becomes larger than the torque upper limit value Tmax again (see the portion shown by the broken line in FIG. 3), the restart of the engine 10a is prohibited (see FIG. 3). (See the "x" mark in 3)).

(C. Action / Effect)
As described above, in the present embodiment, when the HEV 1 performs hybrid running using both the engine 10a and the motor 10b as a driving force source, when the abnormality of the program 132a is detected, the engine control unit 132 Performs the following control. That is, the stop timing of the engine 10a after the abnormality of the program 132a is detected according to the comparison result between the required driving force (accelerator opening Pa) from the driver of the HEV1 and the torque upper limit value Tmax of the motor 10b. Controlled.

  As described above, in the present embodiment, after the abnormality is detected by the program 132a, the engine 10a is stopped, and the hybrid traveling is switched to the motor traveling (the traveling using only the motor 10b as a driving force source), thereby limiting the traveling of the HEV1. Is achieved. That is, by cutting off the driving force from the engine 10a, the travelable distance of the HEV 1 is limited after the abnormality is detected by the program 132a.

  Further, the stop timing of the engine 10a (the timing of switching from hybrid traveling to motor traveling) is controlled in accordance with the result of comparison between the accelerator opening Pa and the torque upper limit value Tmax of the motor 10b, as described below. Become. That is, unlike the case of stopping the engine 10a immediately after the abnormality detection of the program 132a (immediately switching from hybrid running to motor running) as in the comparative example described above, for example, the disturbance of the vehicle behavior in the HEV1 is Reduced or avoided.

  From these facts, in the present embodiment, it is possible to realize a stable running restriction even when the abnormality of the program 132a in the engine control unit 132 is detected during the running of the HEV1 (during the hybrid running). It becomes possible.

  Further, the stop control unit 132d in the engine control unit 132 specifically performs the travel restriction process in the HEV 1 as described below. That is, when the comparison result that the accelerator opening Pa is larger than the torque upper limit value Tmax is obtained, the stop control unit 132d performs control so that the hybrid traveling is continued in the HEV1 without stopping the engine 10a. (See steps S12 and S13 in FIG. 2). On the other hand, when the comparison result that the accelerator opening Pa is equal to or smaller than the torque upper limit value Tmax is obtained, the stop control unit 132d switches from hybrid traveling to motor traveling in HEV1 by stopping the engine 10a. (See steps S12 and S14 in FIG. 2). In this way, by appropriately controlling the traveling mode in the HEV 1 according to the comparison result described above, it is possible to easily realize a stable traveling restriction in the HEV 1.

  Furthermore, after the engine 10a is stopped and the hybrid traveling is switched to the motor traveling, the restart of the engine 10a is prohibited even if the accelerator opening Pa becomes larger than the torque upper limit value Tmax again. So, it becomes as follows. That is, after the engine 10a is once stopped, such restart of the engine 10a is stopped, so that a more stable travel restriction in the HEV 1 can be realized.

  In addition, in the case where the program 132a is obtained via communication from outside the HEV1, if the program 132a is detected as an abnormality of the program 132a, an unauthorized rewriting of the program 132a from outside the HEV1 is detected. Is as follows. That is, for example, in the case where the program 132a is acquired using the above-described OTA, even when the program 132a is illegally rewritten, the stable running restriction can be realized in the HEV1. Becomes

<2. Modification>
The present disclosure has been described above with reference to the embodiments. However, the present disclosure is not limited to the embodiments, and various modifications are possible.

  For example, the configuration (type, shape, arrangement, number, and the like) of each member in the HEV 1 is not limited to that described in the above embodiment. That is, the configuration of each of these members may be another form, shape, arrangement, number, or the like. Further, the values, ranges, magnitude relationships, and the like of the various parameters described in the embodiment are not limited to those described in the embodiment, and may have other values, ranges, magnitude relationships, and the like.

  Specifically, for example, in the above embodiment, the case where one motor (motor 10b) is provided in the HEV 1 has been described as an example, but the present invention is not limited to this example. That is, for example, a plurality of (two or more) motors may be provided in the HEV 1.

  In the above-described embodiment, the traveling control process (the traveling restriction process: see FIGS. 2 and 3) of the HEV 1 has been described with specific examples. However, the present invention is not limited to these specific examples. That is, such a travel restriction process may be performed using another method. Specifically, for example, in the above-described embodiment, after the engine is stopped and the hybrid driving is switched to the motor running, even if the required driving force becomes larger than the torque upper limit value again, the engine is restarted. The case where the start is prohibited has been described as an example, but the present invention is not limited to this example. Further, in the above-described embodiment, a case has been described as an example where the abnormality detection unit detects an unauthorized rewrite of a program from outside the HEV 1 as an abnormality of the program. Is not limited.

  Further, a series of processes described in the above embodiment may be performed by hardware (circuit) or may be performed by software (program). When performed by software, the software includes a group of programs for causing a computer to execute each function. Each program may be used by being incorporated in the computer in advance, for example, or may be used by being installed in the computer from a network or a recording medium.

  In addition, the various examples described above may be applied in any combination.

  It should be noted that the effects described in this specification are merely examples and are not limited, and may have other effects.

  DESCRIPTION OF SYMBOLS 1 ... HEV, 10 ... drive power source, 10a ... engine, 10b ... motor, 11 ... battery, 12 ... accelerator opening sensor, 13 ... control part, 131 ... information acquisition part, 132 ... engine control part, 132a ... program ( 132b: Abnormality detection unit, 132c: Comparison unit, 132d: Stop control unit, 133: Motor control unit, Ie: External information, Pa: Accelerator opening, Tmax: Torque upper limit value, t1, t2, t3: Timing .

Claims (4)

An abnormality detection unit that detects an abnormality of a program recorded in an engine control unit that controls the operation of the engine in a hybrid vehicle having an engine and a motor as a driving force source;
When the hybrid vehicle is performing a first travel using both the engine and the motor as a driving force source, and the abnormality detection unit detects an abnormality in the program, a driver of the hybrid vehicle And a comparison unit that compares the required driving force from the torque upper limit value of the motor,
A stop control unit that controls a stop timing of the engine after an abnormality of the program is detected in accordance with a comparison result between the required driving force and the torque upper limit value in the comparison unit. Travel control device. The stop control unit,
When the comparison result that the required driving force is larger than the torque upper limit value is obtained,
Controlling the first traveling to be continued in the hybrid vehicle without stopping the engine;
When the comparison result that the required driving force is equal to or less than the torque upper limit value is obtained,
The travel control of the hybrid vehicle according to claim 1, wherein the engine is stopped so that the hybrid vehicle switches from the first travel to a second travel using only the motor as a driving force source. apparatus. After the engine is stopped and switched from the first traveling to the second traveling,
The travel control device for a hybrid vehicle according to claim 2, wherein restart of the engine is prohibited even when the required driving force becomes larger than the torque upper limit value again. The program is obtained via communication from outside the hybrid vehicle,
The hybrid vehicle travel control device according to any one of claims 1 to 3, wherein the abnormality detection unit detects an unauthorized rewrite of the program from the outside as an abnormality of the program.

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