JP6733342B2 - Vehicle control device - Google Patents

Description

The present invention relates to a vehicle control device that controls a vehicle during a shift operation.

2. Description of the Related Art Conventionally, a technique is known in which, instead of operating a shift lever to mechanically change the gear stage of a transmission, the gear stage is changed by an electrically controlled actuator. Patent Document 1 discloses a technique of controlling the actuator in a transmission synchronization device to increase the accuracy of the axial load of the sleeve.

JP, 2002-48225, A

By the way, in the case of performing the electronic signal type shift operation as described above, if the speed of the vehicle is too high, the gear position may not be changed against the intention of the driver even if the shift operation is tried.
If the driver is unfamiliar with the electronic signal type shift operation, the driver may be confused if the gear position is unintentionally not changed despite the shift operation to use the engine brake. It can happen.

Therefore, the present invention has been made in view of these points, and an object thereof is to provide a technique capable of completing a shift operation in accordance with a driver's intention.

In the first aspect of the present invention, a speed measuring unit that measures a speed of a vehicle, a shift operation receiving unit that receives an instruction to shift a gear stage of a transmission, and a shift operation receiving unit when the shift operation receiving unit receives the instruction. , A speed changing unit that shifts the gear speed, a rotation speed specifying unit that specifies the rotation speed of the engine when the shift of the gear speed is completed, and a rotation speed of the engine that is specified by the rotation speed specifying unit are preset. And a vehicle speed control unit that controls to decelerate the vehicle when the allowable rotational speed is exceeded.

The vehicle control device further includes a rotation speed acquisition unit that acquires an actual rotation speed of the engine, and the vehicle speed control unit prevents the actual rotation speed of the engine from exceeding the preset allowable rotation speed. Alternatively, control may be performed to adjust the clutch connection state to decelerate the vehicle.

The vehicle speed control unit may control to decelerate the vehicle by braking wheels.

The vehicle control device may further include a notification unit that notifies the driver when the rotation speed of the engine specified by the rotation speed specifying unit is not a preset allowable rotation speed.

According to the present invention, it is possible to complete the shift operation according to the driver's intention.

It is a figure for explaining the vehicle control device concerning an embodiment. It is a figure which shows the structure of a vehicle control apparatus. It is a figure for explaining a mode that a vehicle speed control part decelerates a vehicle. It is a flow chart explaining operation of a vehicle control device.

<Overview>
FIG. 1 is a diagram for explaining a vehicle control device according to an embodiment. FIG. 1 illustrates a state in which the vehicle T goes down a slope. The vehicle T is, for example, a large truck having a total vehicle weight of 10 tons or more. When such a large truck goes down a slope, the vehicle T accelerates due to the weight of the vehicle and the weight of the loaded luggage, and thus a large braking force is required to decelerate the vehicle T. Therefore, for example, when trying to decrease the speed of the vehicle T, the driver does not rely on only the foot brake but also tries to brake the vehicle T by downshifting the gear and using the engine brake. ..

By the way, in the case of a vehicle equipped with a transmission that shifts gears by an electromagnetic air type transmission mechanism, in order to prevent the engine speed from being exceeded, each gear has a range of vehicle speeds that can be shifted down. .. Therefore, if the vehicle speed is too fast, the gear may not accept the downshift contrary to the driver's intention to downshift. As a result, a driver unfamiliar with the transmission may try to apply the engine brake, but may be confused by being distracted by the fact that the gear position is not changed.

When the vehicle T on which the vehicle control device according to the embodiment is mounted receives an instruction to shift the gear stage from the driver, the vehicle T accepts the shift operation to the gear stage of the transmission regardless of the speed of the vehicle T. The vehicle T specifies the engine speed when the clutch is completely engaged after shifting the gear. When the engine speed exceeds the so-called rev limit, the vehicle T decelerates sufficiently and then completely engages the clutch. The configuration of the vehicle control device will be described below with reference to FIG.

[Configuration of vehicle control device]
FIG. 2 is a diagram showing a configuration of the vehicle control device 1. The vehicle control device 1 has a storage unit 2 and a control unit 3.

The storage unit 2 includes, for example, a ROM (Read Only Memory) in which a program executed by the control unit 3 is recorded and a RAM (Random Access Memory) that temporarily stores data.

The ROM stores a map in which the speed of the vehicle T, the gear position, and the engine speed are associated with each other. Further, the ROM stores a range of speeds of the vehicle T that can be shifted to each gear and an allowable engine speed, that is, a rev limit. The rev limit is, for example, 2300 rpm. The RAM stores, for example, the speed of the vehicle T, the number of revolutions of the engine when the downshift of the gear stage is completed, and the like. Here, to complete the shift of the gear stage means to completely connect the clutch after changing the transmission to the target gear stage.

The control unit 3 is, for example, a CPU (Central Processing Unit). The control unit 3 executes the program recorded in the storage unit 2 to execute the speed measurement unit 4, the rotation speed acquisition unit 5, the shift operation reception unit 6, the transmission unit 7, the rotation speed identification unit 8, and the vehicle speed control unit 9. And functions as the notification unit 10.

The speed measuring unit 4 is connected to, for example, a vehicle speed sensor (not shown), and measures the speed of the vehicle T using the vehicle speed sensor. The speed measuring unit 4 notifies the rotation speed specifying unit 8 described later of the speed of the vehicle T.

The rotation speed acquisition unit 5 is connected to, for example, an engine rotation sensor (not shown) attached to the engine E, and acquires the actual rotation speed of the engine E from the engine rotation sensor. The rotation speed acquisition unit 5 notifies the vehicle speed control unit 9 described later of the rotation speed of the engine.

The shift operation receiving unit 6 receives an instruction to shift the gear stage of the transmission 12 when the driver operates the shift lever 11. In other words, the shift operation receiving unit 6 receives the information of the gear stage to be reflected in the transmission 12 when the driver operates the shift lever 11. Specifically, the shift operation receiving unit 6 receives an electronic signal instructing to change the gear position, which is transmitted when the driver operates the shift lever 11. When the shift operation receiving unit 6 receives the instruction to shift the gear stage, it issues an instruction to the transmission unit 7 to shift the gear stage. Further, when the shift operation receiving unit 6 receives the instruction to shift the gear stage, the shift operation receiving unit 6 notifies the rotation number identifying unit 8 of which gear stage the change instruction is issued.

The transmission unit 7 shifts the gear stage of the transmission 12 when the shift operation receiving unit 6 receives the instruction. Specifically, the rotation speed acquisition unit 5 issues an instruction to the actuator and fixes it on the target gear. When the speed change unit 7 shifts the gear, the clutch 13 is not completely engaged until the rotation speed specifying unit 8 specifies that the rotation speed of the engine E does not exceed the rev limit.

When notified of which gear stage the shift operation is to be received from the shift operation receiving unit 6, the rotation speed identification unit 8 identifies the rotation speed of the engine E when the gear shift is completed. Specifically, the rotation speed specifying unit 8 acquires the speed of the vehicle T from the speed measuring unit 4 and refers to the map recorded in the storage unit 2 to refer to the engine E when the gear shift is completed. Specify the rotation speed of. As described above, the map records the engine speed corresponding to the speed and the gear position of the vehicle T.

When the rotation speed of the specified engine E exceeds the rev limit, the rotation speed specifying unit 8 notifies the vehicle speed control unit 9 to decelerate the vehicle T. In addition, the rotation speed identification unit 8 notifies the notification unit 10 when the rotation speed of the identified engine E exceeds the rev limit.

The vehicle speed control unit 9 controls to decelerate the vehicle T when the rotation speed of the engine E specified by the rotation speed specifying unit 8 exceeds a preset allowable rotation speed. When receiving the notification from the rotation speed specifying unit 8 to decelerate the vehicle T, the clutch T and the brake 14 for braking the wheels are controlled to decelerate the vehicle T. Hereinafter, a method by which the vehicle speed control unit 9 decelerates the vehicle T will be described with reference to FIG. In addition, decelerating the vehicle T using the clutch 13 means connecting the clutch 13 and applying engine braking to the vehicle T. The strength of the engine brake is changed according to the connection state of the clutch 13.

[Deceleration method of vehicle T]
FIG. 3 is a diagram for explaining how the vehicle speed control unit 9 decelerates the vehicle T. FIG. 3A illustrates how the speed of the vehicle T changes over time. The allowable speed described in FIG. 3A is a speed corresponding to the rev limit. That is, if the speed of the vehicle T is equal to or lower than the allowable speed, the rotation speed of the engine E after shifting the gear stage does not exceed the rev limit. The allowable speed is determined for each gear. FIG. 3B is a diagram showing a connected state of the clutch. FIG. 3C is a diagram showing a temporal change of the ON/OFF signal of the brake 14.

The vehicle speed control unit 9 controls the clutch T by adjusting the clutch engagement state so that the actual rotational speed of the engine E does not exceed a preset allowable rotational speed. Further, at this time, the vehicle speed control unit 9 controls to decelerate the vehicle T by using the braking of the wheels together.

In the example shown in FIG. 3, the vehicle speed control unit 9 turns on the signal of the brake 14 and starts the braking of the wheels at the time t0 when the instruction to decelerate the vehicle T is received. The vehicle speed control unit 9 starts connecting the clutch 13 at time t1 when the speed of the vehicle T decreases. The vehicle speed control unit 9 increases the deceleration of the vehicle T by using the clutch 13 and the brake 14 together, and at time t2 when the speed of the vehicle T becomes lower than the allowable speed, the clutch 13 is completely engaged and the brake 14 operates. Stop using. The clutch 13 may be fully connected at the same time that the speed of the vehicle T is below the allowable speed, or may be completely connected after the speed of the vehicle T is sufficiently lower than the allowable speed. The vehicle speed control unit 9 refers to the rotation speed of the engine E acquired by the rotation speed acquisition unit 5 and the map recorded in the storage unit 2 to determine whether the speed of the vehicle T is lower than the allowable speed. To do.

The wheels are braked, for example, by transmitting an electronic signal for generating hydraulic pressure in a vacuum type booster brake with a precharge function. Further, the clutch connection state is changed from a state where the clutch is completely disengaged to a state where the clutch is completely connected, for example, by transmitting a signal to the actuator.

The notification unit 10 notifies the driver when the rotation speed of the engine E specified by the rotation speed specifying unit 8 is not a preset allowable rotation speed. Specifically, the notification unit 10 causes the warning light provided on the dashboard to blink, sounds an alarm, and vibrates the steering wheel when the rotation speed of the engine E after completing the gear shift exceeds the rev limit. Notify the driver by means such as Hereinafter, a process from when the vehicle control device 1 receives an instruction to shift the gear stage to when the shift operation is completed will be described with reference to FIG. 4.

FIG. 4 is a flowchart illustrating the operation of the vehicle control device 1. First, the shift operation receiving unit 6 receives an instruction to shift the gear (S41). Subsequently, the transmission unit 7 receives the notification from the shift operation reception unit 6 and shifts the gear stage of the transmission 12 (S42). That is, the transmission unit 7 accepts the gear stage operation of the shift knob. Subsequently, the rotation speed identification unit 8 receives the notification from the shift operation reception unit 6 and determines whether the rotation speed of the engine is within the allowable range (S43).

When the engine speed is not within the allowable range (NO in S43), vehicle speed control unit 9 brakes the wheels to decelerate vehicle T (S44). Further, the vehicle speed control unit 9 adjusts the connection state of the clutch 13 to decelerate the vehicle T (S45). Subsequently, the vehicle speed control unit 9 determines whether or not the speed of the vehicle T is within a range in which the gear shift is allowable (S46).

When the speed of the vehicle T is not within the range in which the shift of the gear position is allowable (NO in S46), the vehicle control device 1 returns to S44. When the speed of the vehicle T is within the range in which the shift of the gear stage is allowable (YES in S46), the vehicle speed control unit 9 completely connects the clutch (S47), and the vehicle control device 1 ends the process.

When the engine speed is within the allowable range (YES in S43), vehicle speed control unit 9 completely connects the clutch (S47), and vehicle control device 1 ends the process.

[Effects of the vehicle control device 1]
As described above, when the vehicle control device 1 according to the embodiment receives the instruction to shift the gear stage, the vehicle control device 1 shifts the gear stage even if the speed of the vehicle T is higher than the allowable speed, and the clutch 13 and the brake 14 are operated. To brake the vehicle T. That is, the vehicle control device 1 accepts the driver's shift operation even if the speed of the vehicle T exceeds the allowable speed. Therefore, it is possible to prevent the transmission T from being downshifted and the vehicle T from not decelerating against the driver's intention. That is, it is possible to prevent the mechanism that receives the shift operation from rejecting the driver's intention and causing the vehicle T not to decelerate. In addition, it is possible to expect the effect of eliminating the factors that confuse the driver and keeping the subsequent operation calm.

Although the present invention has been described using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It is apparent to those skilled in the art that various modifications and improvements can be added to the above-described embodiment. It is apparent from the scope of the claims that the embodiment added with such changes or improvements can be included in the technical scope of the present invention.

<Modification 1>
In the description of the embodiment, the vehicle speed control unit 9 decelerates the vehicle T using both the clutch 13 and the brake 14 when the speed of the vehicle T exceeds the allowable speed. The vehicle speed control unit 9 may use only one of the clutch 13 and the brake 14 to reduce the speed of the vehicle T below the allowable speed and complete the gear shift.

<Modification 2>
When the rotation speed of the engine E specified by the rotation speed specifying unit 8 is higher than a predetermined rotation speed that is higher than a preset allowable rotation speed, the vehicle speed control unit 9 operates the clutch 13 and the brake 14. May be used together to decelerate the vehicle T. The predetermined rotation speed is, for example, a rotation speed set in order to prevent the wear of the clutch 13 from becoming severe when the vehicle T is decelerated using only the clutch 13. As an example, the predetermined rotation speed is 2800 rpm. By doing so, it is possible to prevent the wear of the clutch 13 from becoming significant.

<Modification 3>
When the rotation speed of the engine E specified by the rotation speed specifying unit 8 is higher than a predetermined rotation speed, the vehicle speed control unit 9 first decelerates the vehicle T using the brake 14 and then connects the clutch 13. Then, the engine brake may be used to decelerate the vehicle T. As an example, the predetermined rotation speed is 2800 rpm. By doing so, it is possible to prevent the wear of the clutch 13 from becoming significant.

T... Vehicle E... Engine 1... Vehicle control device 2... Storage unit 3... Control unit 4... Speed measurement unit 5... Rotation speed acquisition unit 6... Shift operation Reception unit 7... Speed changing unit 8... Rotation speed specifying unit 9... Vehicle speed control unit 10... Notification unit 11... Shift lever 12... Transmission 13... Clutch 14... Brake

Claims (2)

A speed measurement unit that measures the speed of the vehicle,
A shift operation reception unit that receives an instruction to shift the gear stage of the transmission,
A shift unit that shifts the gear when the shift operation receiving unit receives the instruction,
A rotation speed specifying unit that specifies the rotation speed of the engine when the change of the gear stage is completed,
When the rotation speed of the engine specified by the rotation speed specifying unit exceeds a preset allowable rotation speed, while controlling the brake that brakes the wheels of the vehicle to reduce the speed of the vehicle. A vehicle speed control for completely connecting the clutch when the clutch of the vehicle is started and the vehicle is further decelerated so that the engine speed reaches a rotational speed within an allowable range for the gear shift. Department,
A vehicle control device including. When the engine speed identified by the engine speed identification unit is not within the allowable range of shift of the gear stage, a notification unit is provided to notify the driver.
The vehicle control device according to claim 1.

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