JP2589585Y2 - Vehicle speed reducer - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle speed reducer having a throttle valve interlocked with an accelerator pedal.

[0002]

2. Description of the Related Art A vehicle having an engine having a throttle valve in an intake system and a manual transmission is known. In such a vehicle, when the foot is released from the accelerator pedal, if the vehicle speed is above a certain value and the transmission is in a low gear, the reduction ratio of the transmission is large, and FIG. 6 and FIG. As shown, the engine friction is sharply increased due to the closing of the throttle valve of the engine, so that the engine brake is suddenly applied, and there is a risk that a standing passenger falls on a bus or the like.

Japanese Patent Application Laid-Open No. 54-76722 discloses a technique for detecting a deceleration state of an engine from a throttle valve switch, a neutral switch of a transmission, and a vehicle speed switch. However, such known technology does not take measures against engine braking,
It is not possible to prevent sudden braking by the engine brake.

[0004]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a vehicle speed reducer which does not suddenly decelerate due to engine braking even if the accelerator pedal is released while the vehicle is running at a low shift speed. It is in.

[0005]

According to the present invention, in a reduction gear for a vehicle having a throttle valve interlocked with an accelerator pedal, an air bypass passage for bypassing the throttle valve is provided.
An air regulating valve is provided in the air bypass passage, and a control device having a map for determining the opening of the air regulating valve at the time of engine braking according to the vehicle speed and the shift stage is provided, and the control device operates when the throttle valve is fully opened. The control unit controls the opening of the air control valve according to the map, reads the shift position, the vehicle speed, and the accelerator position, determines whether or not the engine is in a brake state, and if the engine is in a brake state, determines in advance. It has a function of judging whether or not the vehicle is in a rapid deceleration range based on a map, and operating the air adjusting valve if the vehicle is in a rapid deceleration range.

[0006]

In the vehicle speed reducer constructed as described above, the control device determines on a map if the accelerator is depressed during traveling at the low speed of the transmission and the vehicle is in a range where rapid deceleration is applied. Since the air regulating valve is opened to supply air to the engine from the bypass passage to reduce engine friction, the vehicle does not suddenly decelerate.

At this time, the fuel is closed by the shutoff valve.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below 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 therebetween. Further, an intake pipe 6 is provided in the intake manifold 1 with a throttle valve 7 and a mixer 8 interposed therebetween, 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 an emergency shutoff valve 1 is provided from a side near the cylinder 10.
3, 14, primary pressure reducing valve 15, secondary pressure reducing valve 16, safety valve 1
The eighth, third pressure reducing valve 17 and the shutoff valve 19 are connected to the mixer 8 by the fuel circuit 22.

A fuel bypass valve 23 is interposed between the fuel circuit 22 downstream of the shut-off valve 19 and the intake pipe 6, and the secondary pressure reducing valve 16 and the tertiary pressure reducing valve 17 are connected to the air circuit 20 by an air duct. 9, the primary pressure reducing valve 15 is connected to the water circuits 15a, 1
5b and is cooled.

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 connected by an air bypass passage 24, and the air bypass passage 2
4 is provided with an air regulating valve 25. Its regulating valve 2
Reference numeral 5 denotes an electric circuit connected to a control device 26. The control device 26 is connected to the shut-off valve 19 and an engine rotation sensor F, a vehicle speed sensor G, a shift position sensor H, and an accelerator position sensor J (not shown).

Referring also to FIG. 4, the control device 26 has a map for determining conditions for opening and closing the air regulating valve 25.

The control flow will be described below with reference to FIG.

In operation, first, a shift position, a vehicle speed, and an accelerator position are read (step S1). It is determined whether or not the engine is in a brake state (step S2). If the determination is NO, the process returns. If the determination is YES, it is determined whether or not the vehicle is within the rapid deceleration range A based on the map of FIG. 4 (step S3). If the determination is NO, the process returns. If the determination is YES, the air adjustment valve is operated (step S4), and the control is terminated.

That is, when the accelerator pedal is released, the control device opens the air regulating valve 25 and supplies air to the engine from the bypass passage to reduce friction if the vehicle is in the rapid deceleration range A shown in FIG. The control is performed such that the adjustment valve 25 is kept closed when the pressure is reduced and is within the range B of the map.

Accordingly, as shown in FIG. 3, the vehicle speed does not drop sharply like D when the accelerator pedal is released, but gradually curves like E and drops like C as shown in FIG.

FIG. 5 shows the relationship between the state of the opening X of the air regulating valve and the accompanying engine braking force Y and the vehicle speed Z.

[0020]

[Effects of the Invention] As described above, according to the present invention, the following excellent effects can be obtained. (A) Since the control device opens and closes the air regulating valve according to the map, it is possible to make an appropriate determination. (B) Since only the air regulating valve is opened to supply air and reduce friction, fuel can be saved. (C) Even if the accelerator pedal is released when the transmission is in the low gear, rapid deceleration is not performed and there is no shock, so that riding comfort is good.

[Brief description of the drawings]

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

FIG. 2 is a flowchart of the control in FIG. 1;

FIG. 3 is a view for explaining effects based on a relationship between vehicle speed and time.

FIG. 4 is a diagram showing an example of a control map.

FIG. 5 is a diagram illustrating a relationship among an adjustment valve opening, an engine braking force, and a vehicle speed.

FIG. 6 is a diagram showing a relationship between engine friction and throttle opening according to the related art.

FIG. 7 is a diagram showing a relationship between engine friction, intake air amount, and intake manifold negative pressure according to the related art.

[Explanation of symbols]

 DESCRIPTION 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 ... Air regulating valve 26 ... Control device

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hiroshi Matsuda Nissan Diesel Kogyo Co., Ltd., 1st place, Dai-Chome, Ageo City, Saitama Prefecture (56) References JP-A-54-76722 (JP, A) JP-A-1 JP-134071 (JP, A) JP-A-2-61344 (JP, A) JP-A-2-45633 (JP, A) JP-A-64-45945 (JP, A) (58) Fields investigated (Int. . ^6, DB name) F02D 41/12 315 F02D 29/02 F02D 41/04 315

Claims (1)

(57) [Scope of request for utility model registration] 1. A speed reduction device for a vehicle having a throttle valve interlocked with an accelerator pedal, an air bypass passage bypassing the throttle valve is provided, an air regulating valve is provided in the air bypass passage, and an engine brake is provided according to a vehicle speed and a shift stage. A control device having a map that determines the opening of the air regulating valve during operation, wherein the control device controls the opening of the air control valve according to the map when the throttle valve is fully opened; and The shift position, the vehicle speed, and the accelerator position are read, and it is determined whether or not the engine is in a brake state. If the engine is in the brake state, a predetermined map is used to determine whether or not the vehicle is in a rapid deceleration range. A vehicle deceleration device having a function of operating an air adjustment valve within a deceleration range.