JP6038683B2 - Vehicle with automatic transmission - Google Patents

Description

  The present invention relates to a vehicle with an automatic transmission provided with fuel injection control means capable of normal mode injection control and eco mode injection control that suppresses the fuel injection amount as compared with the normal mode injection control.

  Conventionally, many commercial vehicles such as trucks are equipped with an automatic transmission. As such an automatic transmission device, there is known a device using a mechanical clutch and a gear-type transmission, provided with various sensors for detecting the operation state thereof and an actuator for driving these sensors (for example, Patent Documents). 1). In such a vehicle transmission device, an automatic transmission is shifted up or down by controlling an actuator by a control unit which is a shift control means based on detection signals of various sensors, instead of manually shifting by an operating force of a driver. Thus, the transmission is controlled to be shifted to the target shift speed obtained from the accelerator pedal depression amount or the driver required torque.

  In recent years, from the viewpoint of energy saving, normal mode injection control based on the normal mode injection map and eco mode injection control set to suppress the fuel injection amount compared to the normal mode injection map are possible. A vehicle having fuel injection control means has also been proposed (see, for example, Patent Document 2). In such fuel injection control means, when eco-mode injection control is performed, the vehicle travels while suppressing the fuel injection amount, so that it is possible to increase the vehicle travel amount per unit fuel. .

  Here, in a vehicle including fuel injection control means capable of such normal mode injection control and eco mode injection control, a changeover switch for switching between the normal mode injection control and the eco mode injection control is provided. And since the amount of fuel injection is suppressed in a vehicle traveling by eco-mode injection control, it is difficult to accelerate the vehicle suddenly. For this reason, a driver who wants to accelerate a vehicle traveling by eco-mode injection control uses a changeover switch to switch from eco-mode injection control to normal mode injection control to increase the fuel injection amount and increase the engine speed. The vehicle tends to be accelerated by increasing the output torque associated therewith.

JP-A-6-241300 Japanese Patent Laying-Open No. 2005-42872 (paragraph number “0014”)

  However, even in the eco mode injection control, for example, when the vehicle travels uphill, the fuel injection amount is gradually increased in order to maintain the traveling speed of the vehicle. For this reason, the fuel injection amount of the vehicle traveling on the uphill in the eco mode injection control approaches the fuel injection amount in the normal mode injection control and becomes substantially the same. Then, even if a driver who wants to accelerate the vehicle uphill by eco-mode injection control switches from eco-mode injection control to normal mode injection control with a changeover switch, the fuel injection amount is immediately Does not increase. Therefore, conventionally, there has been a problem that even if the eco mode injection control is switched to the normal mode injection control, the vehicle traveling uphill cannot be accelerated sufficiently.

  An object of the present invention is to provide a vehicle with an automatic transmission that can realize acceleration of a vehicle when a driver who wants to accelerate switches from eco mode injection control to normal mode injection control.

  The present invention includes an automatic transmission capable of downshifting, shift control means for shifting the automatic transmission, and eco-mode injection control that suppresses fuel injection amount compared to normal mode injection control and normal mode injection control. This is an improvement of a vehicle provided with possible fuel injection control means and a changeover switch for switching between normal mode injection control and eco mode injection control.

  The characteristic configuration is provided with driver intention detection means for detecting the intention of the driver to be accelerated, and the shift control means detects the intention of the driver to be accelerated by the driver intention detection means, and the changeover switch. Thus, when the eco mode injection control is switched to the normal mode injection control, the automatic transmission is configured to shift down.

  Here, the driver intention detection means is an accelerator sensor that detects the depression amount of the accelerator pedal, and the shift control means is a driver that the detection output of the accelerator sensor indicating depression of the accelerator pedal more than a predetermined amount is to be accelerated. It is preferable to have the intention.

  In the vehicle with an automatic transmission according to the present invention, when the changeover switch is operated in a state where the intention of the driver to be accelerated is detected and the eco mode injection control is switched to the normal mode injection control, the automatic transmission is shifted down. Therefore, the engine speed increases due to the shift down, and the output torque generated by the engine can be increased. This increase in output torque makes it possible to sufficiently accelerate the vehicle.

It is a flowchart which shows operation | movement of the vehicle with an automatic transmission of this invention embodiment. It is a block diagram of the vehicle with the automatic transmission. It is a figure which shows the relationship between the road gradient in the state in which the vehicle with an automatic transmission drive | works an uphill in eco mode fuel injection control, a vehicle speed, and a fuel injection amount. It is a figure which shows the relationship between the depression amount of the accelerator pedal of the vehicle with the automatic transmission, and the fuel injection amount.

  Next, the best mode for carrying out the present invention will be described with reference to the drawings.

  FIG. 2 shows a configuration of a vehicle 10 with an automatic transmission according to the present invention. The vehicle 10 is a large vehicle such as a truck. The vehicle 10 is provided with an engine 12 as a power source at the front, and a transmission 15 is connected to the engine 12 via a shaft 16. The wheel 17b is further connected. The transmission 15 that transmits the output of the engine 12 to the wheels is an automatic transmission that can be shifted down and up, and is connected to the control output of an automatic transmission ECU 18 that is a shift control means. Further, the vehicle 10 is provided with an engine ECU 19 that is a fuel injection control means of the engine 12, and the control output is connected from the engine ECU 19 to the fuel injection device 12 a in the engine 12.

  Further, the vehicle 10 detects the position of an accelerator sensor 24 that detects the amount of depression of the accelerator pedal 11, a changeover switch 26 that switches between a normal mode injection control and an eco mode injection control (to be described later) in the engine ECU 19, and a select lever 22. A range sensor 21 is provided. The automatic transmission ECU 18, the engine ECU 19, the accelerator sensor 24, the changeover switch 26, and the range sensor 21 described above and the other sensors (not shown) are connected via a CAN (Controller Area Network) 23 and can communicate with each other. The

  The select lever 22 has a P (parking) position where the vehicle 10 is stopped, an R (reverse) position where the vehicle 10 is moved backward, an N (neutral) position where the power of the engine 12 is not transmitted to the propeller shaft 16, and It is configured to be movable to a D (drive) position or the like for traveling. The automatic transmission ECU 18 is configured to shift down or up the automatic transmission 15 in accordance with conditions such as the detection output of the range sensor 21, the depression amount of the accelerator pedal 11, the vehicle speed, and the like. That is, when the select lever 22 selects the D range, the automatic transmission ECU 18 automatically issues a command to upshift when the operating point determined by the accelerator opening and the vehicle speed exceeds an upshift line on a predetermined shift map (not shown). When the operating point exceeds the downshift line on the shift map, a command to downshift is output to the automatic transmission 15 to automatically change the gear position.

  On the other hand, the engine ECU 19 is provided with a memory 19a. The memory 19a stores a normal mode injection map 19b indicating the relationship between the depression amount of the accelerator pedal 11 and the fuel injection amount. The normal mode injection map 19b is FIG. 4 shows the relationship between the depression amount of the accelerator pedal 11 and the fuel injection amount that generates the output torque required from the depression amount (FIG. 4). Based on the normal mode injection map 19b, the engine ECU 19 performs normal mode injection control for controlling the fuel injection device 12a, and a fuel injection device that injects less fuel than the fuel injection amount indicated by the normal mode injection map 19b. Both eco-mode injection controls for controlling 12a are possible. Even in the eco mode injection control, for example, when the vehicle 10 travels uphill, the engine ECU 19 gradually decreases the fuel injection amount in order to maintain the traveling speed of the vehicle 10. And is finally configured to inject the same amount of fuel as the fuel injection amount based on the normal mode injection map 19b (FIG. 3C).

  The changeover switch 26 is configured such that the driver tilts the operation lever 26a, and the basic state indicated by a dotted line in FIG. 2 indicates a state in which the eco-mode injection control is turned off. The ECU 19 is configured to control the fuel injection device 12a based on the normal mode injection map 19b. Then, the operation lever 26a is tilted one step from the off state, and the tilted state indicated by the solid line indicates a state in which the eco mode is turned on. In this on-state, the engine ECU 19 is configured to control the fuel injection device 12a so as to inject less fuel than the fuel injection amount indicated by the normal mode injection map 19b.

  Further, the vehicle 10 is provided with driver intention detection means for detecting the intention of the driver who wants to accelerate the vehicle 10, and the automatic transmission ECU 18 serving as a shift control means tries to accelerate the driver intention detection means. When the driver's intention is detected and the changeover switch 26 switches from eco mode injection control to normal mode injection control, the automatic transmission 15 is configured to shift down.

  The driver intention detection means in this embodiment is an accelerator sensor 24 that detects the depression amount of the accelerator pedal 11, and the automatic transmission ECU 18 that is a shift control means is an accelerator sensor that indicates depression of a predetermined amount or more of the accelerator pedal 11. The 24 detection outputs are configured as intended by the driver to be accelerated.

  Next, the operation of the vehicle with an automatic transmission configured as described above will be described.

  When the traveling gear is selected in the transmission 15 and the vehicle 10 is traveling at a corresponding speed, when the driver depresses the accelerator pedal 11, as shown in FIG. Increase / decrease and drive the vehicle 10 at a desired speed. Here, if the operation lever 26a of the changeover switch 26 is in the basic state indicated by the dotted line in FIG. 2, the eco-mode injection control is turned off, and the engine ECU 19 is shown by the solid line in FIG. 4 shown in the normal mode injection map 19b. The fuel injection device 12a is controlled on the basis of a line as indicated by. That is, a fuel injection amount corresponding to the depression amount of the accelerator pedal 11 is obtained based on a line as shown by a solid line in FIG. 4, and the fuel injection device 12a is controlled so as to be the fuel injection amount.

  On the other hand, when the vehicle 10 is driven, if the operation lever 26a of the changeover switch 26 is tilted as shown by the solid line in FIG. 2, the eco mode is turned on, and the engine ECU 19 causes the fuel injection amount line indicated by the normal mode injection map 19b. Perform eco-mode injection control to inject less fuel. That is, the engine ECU 19 has a fuel corresponding to the depression amount of the accelerator pedal 11 based on a line as indicated by a broken line in FIG. 4 that is smaller than a line as indicated by a solid line in FIG. 4 shown in the normal mode injection map 19b. The fuel injection device 12a is controlled so that the fuel injection amount is obtained. As described above, when the eco mode injection control is performed, the vehicle 10 is caused to travel while suppressing the fuel injection amount. Therefore, the travel amount of the vehicle 10 per unit fuel can be increased.

  Since the vehicle 10 traveling under the eco-mode injection control has the fuel injection amount suppressed, as shown in FIG. 3A, when traveling on an uphill in which the road gradient gradually increases, FIG. As indicated by the broken line b), the vehicle speed gradually decreases. Then, even in the eco mode injection control, the engine ECU 19 gradually decreases the amount of decrease in the fuel injection amount as shown by the solid line in FIG. 3C, and finally displays the normal mode injection map 19b. The fuel injection amount is close to the base fuel injection amount, and finally, the same amount of fuel as the fuel injection amount based on the normal mode injection map 19b is injected. As a result, the output of the engine 12 is improved, and the traveling speed of the vehicle 10 can be maintained as shown by the solid line in FIG.

  On the other hand, it is difficult for a driver who wants to accelerate the vehicle 10 traveling uphill by eco-mode injection control to accelerate the vehicle 10 in eco-mode injection control. Returning from the tilted state indicated by the solid line 2 to the basic state indicated by the dotted line, the eco mode injection control is switched to the normal mode injection control. As described above, when the eco-mode injection control is switched to the normal mode injection control by the changeover switch 26, the shift control means shifts down the automatic transmission 15 under a predetermined condition. The flow until the downshift is shown in FIG.

  As shown in FIG. 1, when it is determined that the eco mode injection control has been switched to the normal mode injection control (S1), the driver's intention to accelerate is detected next. This detection is performed by the detection output of the accelerator sensor 24 which is a driver intention detection means. Specifically, it is determined from the detection output of the accelerator sensor 24 whether or not the accelerator pedal 11 is depressed by a predetermined amount or more, and if the accelerator pedal 11 is depressed by a predetermined amount or more, the driver is willing to accelerate. (S2).

  If the driver is willing to accelerate, it is next determined whether or not the fuel injection amount proportional to the amount of depression of the accelerator pedal 11 is the maximum value in the eco mode. Specifically, at the time when the decrease amount from the fuel injection amount in the normal mode injection control is reduced and the eco mode injection control is switched to the normal mode injection control, as after the point A in FIG. Then, it is determined whether substantially the same amount of fuel is injected as that in the normal mode injection control (S3). If it is not the maximum value, the fuel injection amount is increased by switching from the eco mode injection control to the normal mode injection control without shifting down, and the vehicle 10 is accelerated by the increase in the output torque of the engine 12 thereby.

  On the other hand, at the time when the eco mode injection control is switched to the normal mode injection control, as shown after point A in FIG. 3 (c), fuel of the same amount as the fuel injection amount based on the normal mode injection map 19b is injected. If it is (S3), the actual downshift is performed, but as shown in FIG. 1, the number of stages to be shifted down before that and the engine 12 rotational speed in the case of the downshift are obtained (S4). If the determined engine speed is not within the allowable range (S5), for example, if the engine 12 reaches the so-called red zone (dangerous rotation range), the downshift is not performed. , To avoid the occurrence of problems caused by downshifting.

  Then, when the obtained engine speed is within an allowable range (S5), a downshift is executed (S6). Then, the rotational speed of the engine 12 increases due to this downshift, and the vehicle 10 can be accelerated due to the increase in the output torque associated therewith. As a result, it is possible to realize acceleration of the vehicle 10 when a driver who wants to accelerate switches from eco mode injection control to normal mode injection control.

DESCRIPTION OF SYMBOLS 10 Vehicle 11 Accelerator pedal 15 Automatic transmission 18 Automatic transmission ECU (shift control means)
19 Engine ECU (fuel injection control means)
24 accelerator sensor 26 selector switch

Claims (2)

Automatic transmission (15) capable of downshifting, shift control means (18) for shifting the automatic transmission (15), and fuel injection amount compared to normal mode injection control and normal mode injection control In a vehicle comprising fuel injection control means (19) capable of suppressing eco-mode injection control, and a changeover switch (26) for switching between the normal mode injection control and the eco-mode injection control,
Driver intention detection means (24) for detecting the driver's intention to be accelerated is provided,
The shift control means (18)
The driver intention detection means (24) detects the driver intention to be accelerated,
And when the eco-mode injection control is switched to the normal mode injection control by the changeover switch (26),
A vehicle with an automatic transmission configured to shift down the automatic transmission (15). The driver intention detection means is an accelerator sensor (24) for detecting the depression amount of the accelerator pedal (11),
The automatic shift according to claim 1, wherein the shift control means (18) is intended by the driver to accelerate the detected output of the accelerator sensor (24) indicating that the accelerator pedal (11) is depressed more than a predetermined amount. Vehicle with machine.

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