JP2016200093A - Starting assistance device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a starting assistance device capable of easing a sense of incongruity to be given to a driver when starting a vehicle on an ascending slope or under loading.SOLUTION: A starting assistance device 100 includes a target engine speed setting unit 102 for setting a target engine speed relative to an accelerator depressing amount during a time from clutch disengagement to imperfect-clutch engagement when starting a vehicle 101 on an ascending slope or under loading to be higher than when starting the vehicle on a flat road or under unloading.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a start assist device that assists the start of a vehicle on an uphill road or when loaded.

  Conventionally, when the gear is set to the start position when the brake pedal is depressed, the vehicle speed is zero, and the clutch pedal is depressed, in order to prevent the engine from stalling by assisting vehicle start on an uphill road or loading There is known a start assist device that increases a fuel supply amount by a predetermined amount to increase an engine speed even when the accelerator pedal is not depressed (see, for example, Patent Document 1).

JP 11-343888 A

  However, the conventional starting assistance device only increases the engine speed in accordance with the road gradient and loading capacity to prevent engine stall at the time of starting up the vehicle on the uphill road or loading. It is not considered that the driver feels uncomfortable due to the difference between the acceleration feeling felt by the driver at the start of the vehicle and the acceleration feeling felt by the driver when the vehicle starts on a flat road or when there is no load.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a start assisting device that can alleviate the uncomfortable feeling given to the driver when starting a vehicle on an uphill road or loading.

  The start assist device according to the present invention increases the target engine speed with respect to the accelerator depression amount from the clutch disengagement to the half clutch when starting the vehicle on an uphill road or when loading, compared to when starting the vehicle on a flat road or when there is no load. And a target engine speed setting unit.

  It is desirable that the target engine speed setting unit sets the target engine speed so that the start speed of the vehicle is the same when the accelerator depression amount is the same regardless of the road gradient and the load amount.

  The start assist device according to the present invention exhibits an excellent effect that it can alleviate the uncomfortable feeling given to the driver when the vehicle starts on an uphill road or when loading.

1 is an overall configuration diagram of a vehicle equipped with a start assist device according to the present invention. It is a figure explaining operation | movement of the starting assistance apparatus which concerns on a prior art. It is a figure explaining operation | movement of the starting assistance apparatus which concerns on this invention. It is a flowchart explaining operation | movement of the starting assistance apparatus which concerns on this invention.

  Hereinafter, a starting assistance device according to an embodiment of the present invention will be described.

  As shown in FIG. 1, the start assist device 100 according to the embodiment of the present invention sets the target engine speed with respect to the accelerator depression amount from the clutch disengagement to the half clutch when the vehicle 101 starts on an uphill road or when loading. In addition, a target engine speed setting unit 102 that sets higher than when the vehicle 101 starts without loading is provided.

  Here, in the vehicle 101, when the driver depresses the accelerator pedal 103, the command fuel injection amount setting unit 105 of the engine control unit (ECU) 104 determines the command fuel injection amount corresponding to the accelerator pedal depression amount, and the engine Fuel corresponding to the commanded fuel injection amount is injected into the cylinder 108 through the injector 107 by the injector control unit 106 of the control unit 104. As a result, power is obtained by the engine 109, and the power is transmitted to the wheels 112 through the clutch 110 and the transmission 111 to accelerate the vehicle 101. On the other hand, when the driver depresses the clutch pedal 113, the transmission of power between the engine 109 and the transmission 111 is cut off, and the shift operation of the transmission 111 by the shift lever 114 becomes possible.

  The vehicle 101 detects a vehicle speed sensor 115 that detects the speed of the vehicle 101, a clutch pedal sensor 116 that detects the depression of the clutch pedal 113, an accelerator pedal sensor 117 that detects the depression amount of the accelerator pedal 103, and an engine speed. An engine speed sensor 118, a gradient sensor 119 for detecting a road gradient, and a load sensor 120 for detecting the load of the vehicle 101 are provided, and these detected values are grasped by the engine control unit 104.

  When starting the vehicle 101, first, the clutch pedal 113 is deeply depressed to disengage the clutch, and then the shift lever 114 is operated to put the gear of the transmission 111 into the low speed stage. In this state, depress the accelerator pedal 103 and adjust the amount of depressing the accelerator to adjust the engine speed, and then gradually decrease the depression of the clutch pedal 113 to engage the clutch through a half clutch and then clutch engagement. Thus, the power of the engine 109 is transmitted to the wheels 112 through the clutch 110 and the transmission 111.

  At this time, the engine control unit 104 sets the target engine speed with respect to the accelerator depression amount by the target engine speed setting unit 102, and increases the engine speed to the target engine speed by the command fuel injection amount setting unit 105. The required command fuel injection amount is set, and the injector controller 106 injects fuel from the injector 107 based on the command fuel injection amount, thereby increasing the engine speed to the engine speed intended by the driver.

  However, if the driver adjusts the accelerator depression amount in the same way as when the vehicle 101 starts on a flat road or when there is no load, as shown in FIG. Since the engine speed decreases, the speed at which the vehicle 101 starts on a flat road or when there is no load, that is, the start speed expected by the driver cannot be obtained.

  Therefore, in the starting assistance device 100 according to the embodiment of the present invention, as shown in FIG. 3, when starting on an uphill road or loading, the accelerator is operated from the clutch disengagement to the half clutch by the target engine speed setting unit 102. By setting the target engine speed with respect to the depression amount higher than when the vehicle 101 starts on a flat road or when there is no load, the engine speed is increased before reaching the half clutch, so that the engine speed after reaching the half clutch is reached. Make up for the lack of numbers.

  The target engine speed setting unit 102 is detected by the gradient sensor 119 when the vehicle 101 is stopped, that is, when the speed of the vehicle 101 detected by the vehicle speed sensor 115 (hereinafter referred to as detected vehicle speed) is zero. Detected by the accelerator pedal sensor 117 from the clutch disengagement to the half-clutch according to the gradient (hereinafter referred to as the detected gradient) and the load amount detected by the load amount sensor 120 (hereinafter referred to as the detected load amount). The target engine speed with respect to the accelerator depression amount (hereinafter referred to as the detected accelerator depression amount) is set higher than when the vehicle 101 starts on a flat road or when there is no load.

  More specifically, the target engine speed setting unit 102 stores a map (not shown) that defines the relationship between the accelerator depression amount and the target engine speed for each road gradient and load amount. The target engine speed for the detected accelerator depression amount is set from the clutch disengagement to the half-clutch with reference to the optimum map according to the detected gradient and the detected load amount when the vehicle 101 starts.

  In particular, the target engine speed setting unit 102 responds to the detected gradient and the detected load amount so that the start speed of the vehicle 101 is the same when the detected accelerator depression amount is the same regardless of the detected gradient and the detected load amount. It is preferable to set the target engine speed.

  Next, the operation of the starting assistance device according to the embodiment of the present invention will be described.

  As shown in FIG. 4, the start assist device 100 is configured such that when the detected vehicle speed becomes zero, the gear is set to the start position with the clutch pedal 113 depressed, and the accelerator pedal 103 is depressed in step S101. The operation is started when it is determined that the driver intends to start, and the process proceeds to step S102.

  In step S102, the target engine speed setting unit 102 sets a target engine speed for the detected accelerator depression amount with reference to a map corresponding to the detected gradient and the detected load amount, and the process proceeds to step S103.

  In step S103, the commanded fuel injection amount setting unit 105 sets a commanded fuel injection amount that is required to increase the engine speed to the target engine speed, and the process proceeds to step S104.

  In step S104, the injector control unit 106 causes the fuel to be injected from the injector 107 based on the commanded fuel injection amount, thereby increasing the engine speed to the engine speed intended by the driver.

  As described above, according to the starting assistance device 100 according to the embodiment of the present invention, the target engine speed for the detected accelerator depression amount is set according to the detected gradient and the detected load amount. When the vehicle 101 starts, the engine speed can be made higher than the normal start from the clutch disengagement to the half-clutch, and when the vehicle 101 starts, it can be The driver feels uncomfortable due to the difference in acceleration.

  Further, according to the start assist device 100 according to the embodiment of the present invention, when the accelerator depression amount is the same regardless of the road gradient and the load amount, the target engine speed is set so that the start speed of the vehicle 101 becomes the same. Since the number is set, it is possible to eliminate the uncomfortable feeling that the driver feels due to the difference in acceleration between the uphill road and loading and the flat road and no loading when the vehicle 101 starts.

  In addition, this invention is not limited to the above-mentioned embodiment, In the range which does not deviate from the meaning of this invention, it can change suitably and can implement.

  For example, when setting the target engine speed, a map (not shown) that defines the relationship between the accelerator depressing amount at the normal start and the target engine speed corresponding to the accelerator depressing amount is stored. The target engine speed of the map may be corrected upward according to the gradient and the load amount.

100 start assist device 101 vehicle 102 target engine speed setting unit 109 engine 110 clutch

Claims (2)

  Equipped with a target engine speed setting unit that makes the target engine speed relative to the amount of accelerator depression from the clutch disengagement to half-clutch when starting the vehicle on an uphill road or loading, higher than when starting the vehicle on a flat road or no loading A start assist device characterized by that.   The target engine speed setting unit sets the target engine speed so that the start speed of the vehicle is the same when the accelerator depression amount is the same regardless of a road gradient or a load amount. Start assist device.

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