JPH0643234U - Engine speed reduction prevention device when shifting the vehicle - Google Patents

Abstract

(57) [Summary] [Object] The present invention provides an engine speed reduction prevention device that prevents a sudden decrease in engine rotation when the accelerator pedal is released in an engine with a throttle valve and that does not cause a shift shock during clutch meet. The purpose is to do. [Structure] Air bypass passage 24 that bypasses throttle valve 7
When the shift lever is in the neutral position and the accelerator pedal is in the idle position and the detecting means for detecting the acceleration of the vehicle detects that the vehicle is accelerating, On-off valve 25
A control device 26 for opening the door is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an engine speed reduction prevention device at the time of gear shifting of a vehicle having a throttle valve that interlocks with an accelerator pedal.

[0002]

[Prior art]

 In a vehicle having an engine with a throttle valve in the intake system and a manual transmission, when the shift pedal is stepped on and the accelerator pedal is released to put the shift lever in neutral, the throttle valve as shown in Figs. When the engine is closed, that is, when the throttle opening is close to 0, the negative pressure in the intake manifold becomes large and the engine friction rapidly increases, so the engine speed will drop in a short time compared to an engine without a throttle valve. Is known.

[0003]

[Problems to be solved by the device]

 In a transmission with a synchronizer, gear shifting is possible even if the gears of the next gear and the engine speed do not match. Therefore, referring also to FIG. 7, for example, when shifting up from 2nd speed to 3rd speed. Since the engine speed is decreasing from A to B, when the clutch is connected, the vehicle speed is only D and the engine speed is only between B and C, so the engine brake is applied and the vehicle speed increases rapidly. There is a problem that it will decrease.

Therefore, the present invention provides an engine speed reduction prevention device that prevents a rapid decrease in engine rotation when the accelerator pedal is released in an engine with a throttle valve, and that does not cause a shift shock during clutch meet. Has an aim.

[0005]

[Means for Solving the Problems]

 According to the present invention, in the engine rotation speed lowering prevention device at the time of gear shifting of the vehicle having the throttle valve that interlocks with the accelerator pedal, an air bypass passage that bypasses the throttle valve is provided, and an opening / closing valve is provided in the air bypass passage. A control device is provided that opens the opening / closing valve when the shift lever is in the neutral position and the accelerator pedal is in the idle position, and the detection means for detecting the acceleration of the vehicle detects that the vehicle is accelerating.

[0006]

[Action]

 In the engine rotation speed reduction prevention device configured as described above at the time of gear shifting of the vehicle, by opening the opening / closing valve of the air bypass passage by the signal from the control device and allowing the intake air to flow into the engine from the air bypass passage, Even when the accelerator pedal is released and the throttle valve is closed, friction in the intake stroke is reduced.

As a result, the engine speed decreases slowly, the engine speed during clutch meet increases, and shift shock is eliminated.

[0008]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In FIG. 1, an exhaust manifold 2 is attached to an engine E, and an exhaust pipe 3 is provided in the exhaust manifold 2 with a catalyst 4 and a muffler 5 interposed. An intake pipe 6 is provided in the intake manifold 1 via a throttle valve 7 and a mixer 8, and an air duct 9 is attached to the intake pipe 6.

The cylinder 10 is provided with a filling port 12 via a check valve 11, and from the side close to the cylinder 10, the emergency shutoff valves 13, 14, the primary pressure reducing valve 15, the secondary pressure reducing valve 16, the safety valves 18, 3 The next pressure reducing valve 17 and the shutoff valve 19 are connected to the mixer 8 by the fuel circuit 22.

The fuel bypass valve 23 is provided between the fuel circuit 22 downstream of the shutoff valve 19 and the intake pipe 6, and the secondary pressure reducing valve 16 and the tertiary pressure reducing valve 17 are air ducts in the air duct 20. 9, the primary pressure reducing valve 15 is connected to the water circuits 15a and 15b and is cooled.

Further, the fuel bypass valve 23 is connected to the control unit 21 by an electric circuit.

The intake duct 9 and the intake pipe 6 are bypassed by an air bypass passage 24, and an opening / closing valve 25 is interposed in the air bypass passage 24. The on-off valve 25 is connected to a control device 26 by an electric circuit, and the control device 26 is connected to a shutoff valve 19 and an engine speed sensor F, a vehicle speed sensor G, a shift position sensor H, and an accelerator position sensor J (not shown). ing.

Hereinafter, the operation of the control device will be described with reference to FIG.

First, the shift position is read, and the average acceleration for a certain period of time is read from the vehicle speed sensor G that detects whether the vehicle is accelerating (steps S1 and S2). It is determined whether the acceleration is positive (step S3), and if YES, it is determined whether the acceleration is neutral (step S4). If YES, it is determined whether the accelerator position is idle and the vehicle speed is plus (steps S5 and S6). If both are YES, the fuel cutoff valve is energized to be closed and the air bypass opening / closing valve is opened (steps S7 and S8). When steps S3 to S6 are NO, the air bypass opening / closing valve is closed and the fuel cutoff valve is turned off to supply the fuel (steps S10 and S9).

That is, when the transmission is in neutral and the accelerator pedal is released and the vehicle is inertially accelerated, the fuel is cut and the air bypass passage is opened to supply air to control engine friction. .

Therefore, referring to FIG. 3 and FIG. 4, the engine speed A, which has been lowered to B in FIG. 7 in the prior art, is only lowered to C, and for example, the rotation speed shifts from the second speed to the third speed. It matches the number and vehicle speed, and there is no shock during clutch meet.

Further, there is no problem that the engine speed is slightly too fast during the clutch meet.

[0019]

[Effect of device]

 Since the present invention is configured as described above, there is no shift shock at the time of clutch meet when the transmission is upshifted, and riding comfort is improved.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart of the control of FIG.

FIG. 3 is a graph showing the relationship between engine speed and vehicle speed when shifting from second gear to third gear.

FIG. 4 is a relationship diagram between engine speed and engine friction.

FIG. 5 is a relationship diagram between throttle opening and engine friction.

FIG. 6 is a relationship diagram between an intake air amount and engine friction.

FIG. 7 is a diagram showing the relationship between the engine speed and the vehicle speed when shifting from the second speed to the third speed according to the related art.

[Explanation of symbols]

 1 ... Intake manifold 2 ... Exhaust manifold 6 ... Intake pipe 7 ... Throttle valve 8 ... Mixer 9 ... Intake duct 15 ... Primary pressure reducing valve 16 ... Secondary pressure reducing valve 17 ... Tertiary pressure reducing valve 19 ... Shutoff valve 24 ... Air bypass passage 25 on-off valve 26 ... control device

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Internal reference number FI Technical display location F16H 61/00 8009-3J // F16H 59:48 8009-3J (72) Inventor Hiroshi Matsuda Saitama The first place in Ichi-chome, Ageo-shi, Nissan Nissan Diesel Industry Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. An engine speed reduction prevention device for a vehicle having a throttle valve that interlocks with an accelerator pedal, wherein an air bypass passage that bypasses the throttle valve is provided, and an opening / closing valve is provided in the air bypass passage. Is in the neutral position, the accelerator pedal is in the idle position, and the control means for opening the opening / closing valve when detecting that the detection means for detecting the acceleration of the vehicle is accelerating is provided. A device to prevent the engine speed from decreasing during operation.