JPH0618370A - Driver's aid display device - Google Patents

Abstract

PURPOSE:To obtain a driver's aid display device fitted for a novel chasis dynamometer testing method variably setting the acceleration and deceleration times of a car to be tested or the acceleration and deceleration thereof corresponding to the ratio of the bass of the car to be tested and the equivalent inertia mass of a fly wheel. CONSTITUTION:A driver's aid display device 18 equipped with a chart sheet 15 having a running pattern 16 entered therein and the index 17 movable in the direction crossing the time axis direction of the chart sheet 15 at a right angle in connection with the running speed of a car 4 to be tested is provided. The feed speed of the chart sheet 15 in the time axis direction is made variable corresponding to the mass of the car 4 to be tested at the time of the acceleration and deceleration of the car 4 to be tested.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driver's aid display device suitable for a chassis dynamometer test, for example.

[0002]

2. Description of the Related Art The composition and flow rate of automobile exhaust gas change depending on the characteristics of the engine and its operating conditions, and also change depending on maintenance conditions and ambient conditions such as temperature and atmospheric pressure. this house,
Each operating condition except idling includes many factors such as speed, acceleration / deceleration, transmission position, loading state, and road conditions.

Therefore, when measuring the concentration of each component of the exhaust gas, it is necessary to carry out a test, for example, under specified operating conditions, but normally under operating conditions that approximately reproduce the running pattern of an urban road. An exhaust gas test was being conducted.

The above-mentioned running pattern comprises a plurality of running modes in which idling, acceleration, constant speed, and deceleration operation of the test vehicle are combined. Actual driving conditions are set according to this running pattern, for example, Japanese Utility Model Laid-Open No. 63-51249. As in the publication, a driver's aid display device is installed at a position visible to a driver, a chart paper on which a predetermined traveling pattern is drawn is set on the device, and the chart paper is transported at a constant speed. The indicator provided on the display device is moved in a direction perpendicular to the moving direction of the chart paper in accordance with the accelerator operation or vehicle speed of the test vehicle, and the index opening is adjusted according to the running pattern while adjusting the accelerator opening degree of the test vehicle. This was done by moving the test car and simulating the test car in each running mode.

Due to such a test method, a chassis dynamometer that can reproduce each driving condition of an automobile at a fixed position, is easy to measure, is efficient, and has high safety is used for this kind of test. . This chassis dynamometer is generally equipped with multiple equivalent inertial masses consisting of flywheels in order to apply a load due to the mass of the test vehicle under transient operating conditions during acceleration and deceleration of the test vehicle. It was selectively used and summed with the basic inertial mass specific to the chassis dynamometer to make it correspond to the mass of the test vehicle.

[0006]

However, this conventional measuring method requires a plurality of flywheels and a flywheel switching operation according to the mass of the test vehicle. This type of test equipment becomes expensive because of the storage space required for them, the installation space becomes large, and the switching operation becomes complicated, which is one of the reasons for reducing the spread to general automobile maintenance factories. Was becoming.

In view of the above, the inventor uses a constant flywheel irrespective of the mass of the automobile, and can reduce the cost of this type of test apparatus, facilitate the work, and make the installation space compact. And developed a reasonable chassis dynamometer test method

That is, this test method variably sets the acceleration / deceleration time or acceleration / deceleration of the test vehicle according to the ratio of the mass of the automobile to the flywheel, and when the mass of the automobile is equivalent to the mass of the flywheel. The target vehicle travel pattern is approximated by the accelerator opening of the test vehicle. Therefore, this test method requires a new driver's aid display device that serves as a guide when setting the acceleration / deceleration time or acceleration / deceleration, and simply moves the time axis of the chart at a constant speed as in the conventional method to set the target travel pattern. It is not possible to use the above test method with a device that reproduces.

The present invention corresponds to this new and rational chassis dynamometer test method, and the feed rate of the time axis of the chart can be changed according to the mass of the test vehicle during acceleration and deceleration of the test vehicle. It is an object of the present invention to provide a new driver's aid display device which can realize the above-mentioned test method.

[0010]

Therefore, the driver's aid display device of the present invention is linked to the running speed of the test vehicle in the chart sheet on which the running pattern is described and in the direction orthogonal to the time axis direction of the chart sheet. In a driver's aid display device equipped with a movable indicator, the time axis feed rate of the chart seat can be varied according to the mass of the test vehicle during acceleration / deceleration of the test vehicle to determine the accelerator opening of the test vehicle. It is characterized in that it is adapted to a new chassis dynamometer test method that is performed by approximating the target driving pattern. Further, according to the present invention, the moving speed of the index in the time axis direction is made variable according to the mass of the test vehicle in the acceleration / deceleration mode of the traveling pattern, and instead of transferring the chart sheet in the time axis direction, the index is moved in the XY directions. It is characterized in that it is moved to provide a new device substantially equivalent to the above device. Further, the present invention provides
A chart sheet in which the acceleration / deceleration time or the acceleration / deceleration in the acceleration / deceleration mode of the traveling pattern is corrected according to the mass of the test vehicle is provided, and the sheet or the index is moved at a constant speed in the time axis direction to configure the device of this type The feature is that it is designed to simplify.

[0011]

[Operation] When accelerating or decelerating the test vehicle, the speed of movement of the time axis of the chart sheet is variably set or equivalently changed according to the mass of the test vehicle, and the acceleration / deceleration time or acceleration / deceleration is adjusted according to the mass of the test vehicle. Provided is a driver's aid display device adapted to a new chassis dynamometer test method, which is set and the running speed of a test vehicle is approximated to a target running pattern.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An illustrated embodiment in which the present invention is applied to a chassis dynamometer test of an automobile exhaust gas will be described below. In FIGS. 1 to 3, reference numeral 1 is a floor of a test site, and the chassis is faced to the floor 1. The dynamometer 2 is installed, and the wheels 5 of the test vehicle 4 can be ridden on the pair of rollers 3 and 3.

At one end of the rotary shaft of the rollers 3 and 3,
A dynamometer which is a power absorption device is attached, and a flywheel 6 which is an inertial mass is arranged between the dynamometer and the roller 3. The flywheel 6 has a constant mass regardless of the mass of the test vehicle 4, and in the case of the embodiment, the mass is set within the range of the equivalent inertial mass of the vehicle that can be tested by the chassis dynamometer 2. .

Therefore, the chassis dynamometer 2 is provided with a single flywheel 6 and does not have a switching mechanism therefor.

In the test site, a driver's aid display device 8 is provided at an appropriate position where the driver of the test vehicle 4 can see it. The device 8 includes a winding drum 10, a feed drum 11, and a feed roller 1 inside a display screen 9.
2, 13 are provided, and a drive motor 14 having a rotation control device is linked to the take-up drum 10, and these are provided so as to be rotatable in the same direction.

A chart sheet 15 is wound around the winding drum 10, the feed drum 11, and the feed rollers 12 and 13, and the sheet 15 has an idling mode a, an acceleration mode b, and a constant speed mode c. , The target travel pattern 16 including the deceleration mode d.

The target traveling pattern 16 is drawn in the same manner as the conventional traveling pattern in which a plurality of flywheels are selectively used according to the mass of the test vehicle 4 and the acceleration / deceleration time is kept constant. The index 17 is movable in the direction orthogonal to the time axis of the chart sheet 15 in association with the accelerator operation of the vehicle 4 or the vehicle speed.

The rotation speed of the drive motor 14 is determined by the test vehicle 4 under transient operating conditions, that is, during acceleration operation and deceleration operation.
It is variably controlled in relation to the mass ratio between the test vehicle 4 and the flywheel 6 so that the acceleration / deceleration time or the acceleration / deceleration can be adjusted.

That is, the test site is provided with a controller 18 capable of inputting various kinds of information and an arithmetic unit 19 such as a computer capable of performing arithmetic operation based on the information stored in advance under the condition of the input from the controller 18. There is. Among them, the controller 18 controls the mass M of the test vehicle 4 and the equivalent inertial mass m of the flywheel 6, the idling time ta and the acceleration time tb in the target travel pattern 16, the constant speed time tc and the deceleration time td, and the target travel time. The standard rotation speed V of the drive motor 14 corresponding to the pattern is input.

Further, the computing unit 19 has a computing equation of a modified acceleration / deceleration time corresponding to the mass of the test vehicle 4 and a computing equation of a modified acceleration / deceleration rotational speed of the drive motor 14 based on the modified acceleration / deceleration time. Remembered Of these, the modified acceleration / deceleration time T
b and Td are Tb = (m / M) tb, Td = (m / M)
Represented by td, and the rotational speeds Vb and Vd at the time of correction acceleration / deceleration
Is Vb = (tb / Tb) V, Vd = (td / Td) V
It is possible to input these calculation results to the rotation control device of the drive motor 14 during the acceleration / deceleration operation.

Therefore, when m <M, Tb1 <tb and Td1 <td as shown by the broken line in FIG. 3, and Vb,
Vd> V. On the contrary, when m> M, Tb2> tb and Td2> td as shown by the chain line in FIG. 3, and Vb,
Vd <V. In this case, the time during constant speed operation is constant regardless of the mass of the test vehicle 4, and the rotation speed of the drive motor 14 is set to the same speed as the target travel pattern 16.

In addition to the above, 20 in the drawing is an exhaust pipe of the test vehicle 4,
One end of an exhaust gas conduit 21 is connected to the pipe 20, and the other end is connected to an exhaust gas analyzer 22. Reference numeral 23 is a recorder and 24 is a tire stopper.

Instead of changing the moving speed of the chart sheet 15 on the time axis according to the mass of the test vehicle 4 as in the above-described embodiment, the running pattern shown by the broken line or chain line in FIG. 15, which is used properly according to the mass of the test vehicle 4, and the standard rotation speed V
It is also possible to wind and move at a constant speed.

4 to 6 show another embodiment of the present invention, in which the same reference numerals are used for the portions corresponding to the above-mentioned configuration. In this embodiment, the chart sheet 15 is formed of a transparent or semi-transparent member in a flat plate shape, and is held stationary at a fixed position on the display screen 9 while the target traveling pattern 16 drawn on the sheet 15 is idling mode. For each mode b, c, d except a, allowable limit lines 16a, 16b are provided parallel to each other with the characteristic line of each mode sandwiched therebetween.

A pair of roller shafts 25, 26 are provided on both sides of the chart sheet 15 in the time axis direction, and a pair of rollers 27, 28 are fixed to the shaft ends of the shafts 25, 26 between the rollers 27, 28. The belts 29 and 30 are wound around, both ends of the belts 29 and 30 are fixed to the winding drum 10 and the feed drum 11, and the belts 29 and 30 can be wound around these.

Of these, the take-up drum 10 is the arithmetic unit 19
It is linked to a drive motor 14 (not shown) whose rotation is controlled to the above, and the rotational speed is made variable according to the mass of the test vehicle 4 when the test vehicle 4 is accelerated or decelerated as described above. Also, belt 2
A bearing 31 and a coupling 32 are fixed to the back surfaces of the members 9 and 30, and a screw shaft 33 is rotatably supported between them.

The screw shaft 33 is arranged close to the back surface of the chart sheet 15 and orthogonal to the time axis of the sheet 15, and a movable piece 34 is slidably fitted on the shaft 33. Movable piece 34 facing the chart sheet 15
An index 17 such as a point lamp such as a miniature lamp is provided on one side, and the position of the index 17 can be displayed on the chart sheet 15.

One end of the screw shaft 33 is connected to the drive shaft 36 of the marking motor 35 via the coupling 32.
And the operation of the marking motor 35 is
It is controlled in association with the traveling speed of the test vehicle 4.

On the other hand, a sensor (not shown) capable of continuously detecting the position of the index 17 is provided on each of the permissible limit lines 16a and 16b, and the sensor is provided with an alarm and the drive motor 1
4 and the relay contacts of the marking motor 35 are connected.

In using this embodiment, the marking motor 35 is driven in accordance with the running speed of the test vehicle 4, the screw shaft 33 connected to the drive shaft 36 is rotated, and the movable piece fitted to the shaft 33 is rotated. 34, test car 4
The chart sheet 15 is moved in the direction of the speed axis according to the traveling speed.

On the other hand, at the time of the test, the drive motor 14 is driven at the standard speed, the belts 29 and 30 move as shown by the arrow in FIG. 6, and the screw shaft 33 moves through the bearing 31 and the coupling 32 and the chart. The seat 15 moves in the time axis direction, and the movable piece 34 mounted on the shaft 33 moves at the same speed as the time axis moving speed of the target travel pattern 16. Therefore, the movable piece 34 moves in both directions of the velocity axis and the time axis of the chart sheet 15.

At the time of accelerating and decelerating the test vehicle 4, a control signal is input from the calculator 19 to the drive motor 14 as in the above-described embodiment, and the motor 14 controls the mass of the test vehicle 4 as described later. The belts 29 and 30 are driven at a rotation speed related to the ratio of the flywheel 6 to the equivalent inertial mass to move the belts 29 and 30 at a speed corresponding to the above rotation speed. For this reason, the screw shaft 33 and the movable piece 34 attached thereto move in the time axis direction of the chart sheet 15 at the same speed as the belts 29 and 30.

For example, when the mass M of the test vehicle 4 is larger than the equivalent inertial mass m of the flywheel 6, when the idle mode a is changed to the acceleration mode b, the drive motor 1 is used.
4 suddenly increases in speed, and the movable piece 34 moves to the chart sheet 15
In addition to increasing the speed in the time axis direction, the chart sheet 15 moves in the speed axis direction according to the running speed of the test vehicle 4.

On the other hand, when the mass M of the test vehicle 4 is smaller than the equivalent inertial mass m of the flywheel 6, when the idling mode a is changed to the acceleration mode b, the drive motor 1 is used.
4 suddenly decelerates and the movable piece 34 moves to the chart sheet 15
While moving at low speed in the time axis direction of, the chart seat 15 moves in the speed axis direction according to the traveling speed of the test vehicle 4.

As described above, the driver can use the chart sheet 15
The accelerator 17 is operated while keeping an eye on the target 17 which moves downward in the XY directions and the target travel pattern 16 to hold the index 17 within the allowable limit lines 16a and 16b. And index 1
When 7 deviates from the permissible limit lines 16a and 16b, a sensor (not shown) detects this and the alarm device issues a warning, and the drive motor 14 and the marking motor 35 stop driving. As a result, the driver stops driving the test vehicle 4, resets the driver's aid display device 8, and then starts the test.

Thus, in this embodiment, instead of changing the feed rate of the chart sheet 15 in the time axis direction in accordance with the ratio of the mass of the test vehicle 4 and the equivalent inertial mass of the flywheel 6, While keeping the chart sheet 15 stationary, the index 17 is moved in the time axis direction at a variable speed according to the above ratio, and the chart sheet 15 is moved through the relative movement of the chart sheet 15 and the index 17 in the time axis direction. And the index 17 is moved in the velocity axis direction of the chart sheet 15 according to the traveling speed of the test vehicle 4 so as to be adapted to the new chassis dynamometer test method. There is.

As another form of the above embodiment, a modified traveling pattern shown by the broken line or chain line in FIG. 3 is described in the chart sheet 15, which is used properly according to the mass of the test vehicle 4, and the index 17 is used as a standard rotation. It is also possible to move in the time axis direction at a constant speed of the speed V.

The driver's aid display device 8 constructed in this manner is shown in FIGS. 1 to 3 except that the feed speed of the chart sheet 15 can be changed when the test vehicle 4 is accelerated or decelerated as will be described later. Is substantially the same as that of The chassis dynamometer 2 used in this embodiment uses a flywheel 6 having a constant mass regardless of the mass of the test vehicle 4 and does not have a flywheel switching device for the flywheel 6.

Therefore, as in the conventional test method in which a plurality of flywheels are selected and used according to the mass of the test vehicle, a plurality of flywheels are required, or a flywheel switching device requires a plurality of flywheels. Since there is no need for an accommodation space for the wheel and a switching mechanism for the wheel, it can be manufactured at low cost, and the accommodation space can be made compact, so that the installation space for the chassis dynamometer 2 can be reduced.

Next, when carrying out an automobile exhaust gas test using the chassis dynamometer 2, the test vehicle 4 is entered in the test field, the driving wheels 5, 5 are ridden on the rollers 3, 3 and then stopped. .

Before and after the entry of the test vehicle 4, the mass M of the test vehicle 4 is input to the controller 18. In this case, the equivalent inertia mass m of the flywheel 6, which is a known amount,
Or the idling time t in the target driving pattern 16
The a, the acceleration time tb, the constant speed time tc, the deceleration time td, and the standard rotation speed V of the drive motor 14 corresponding to the target traveling pattern have already been input to the controller 18.

Further, before and after the entrance of the test vehicle 4, the flywheel switching operation according to the mass of the test vehicle 4 was conventionally required, but in this embodiment, it is constant regardless of the mass of the test vehicle 4. Since the flywheel 6 having a mass is used, the above switching operation is not required. Therefore, it is possible to solve the conventional complicated work before the test.

Then, one end of an exhaust gas conduit 21 is connected to the exhaust pipe 20 of the test vehicle 4 on the chassis dynamometer 2,
The other end is connected to the exhaust gas analyzer 22, and when a series of preparatory work is completed, the driver's aid display device 8 is started, and the operation of the test vehicle 4 is started.

When the driver's aid display device 8 is started, the drive motor 14 is driven at the standard rotation speed V, the chart sheet 9 is unwound from the feed drum 11, and the chart sheet 9 is taken up by the take-up drum 10. Sheet 9
The target travel pattern 16 depicted in FIG. 2 appears on the display screen 9 and moves in the direction of the arrow in FIG. On the other hand, the index 17 located on the display screen 9 moves in a direction orthogonal to the time axis of the chart sheet 9 in association with the vehicle speed.

The driver has such a target driving pattern 1
The accelerator operation is performed while gazing at the movements of 6 and the index 17, and the test vehicle 4 travels in a simulation based on the target travel pattern 16.

First, in the idling mode a of the target traveling pattern 16, the drive motor 14 is driven at the standard rotation speed to wind up and move the chart sheet 15, and when the idling time ta has elapsed, the mode is changed to the acceleration mode b. To do. At that time, the rotational speed signal during correction acceleration based on the correction acceleration time is output from the arithmetic unit 19 to the rotation control device of the drive motor 14, and the rotation speed of the motor 14 is switched.

That is, the corrected acceleration time Tb is defined as follows: where the equivalent inertial mass of the flywheel 6 is m, the mass of the test vehicle 4 is M, and the acceleration time in the target traveling pattern 16 is tb.
It is corrected to Tb = (m / M) tb. Therefore, m <
When M, Tb1 <tb is corrected as shown by the broken line in FIG. 3, and when m> M, Tb2> as shown by the chain line in FIG.
It is modified to tb. When m = M, the acceleration time t
b is not modified.

Therefore, if the standard rotation speed is V, the correction acceleration rotation speed Vb of the drive motor 14 is inversely proportional to the ratio between the correction acceleration time Tb and the acceleration time tb, and thus Vb
= (Tb / Tb) V. Therefore, m <M
When it is, Vb> V is corrected and the accelerator pedal depression amount of the test vehicle 4 is increased, and when it is m> M, Vb <V is corrected and the accelerator pedal depression amount is decreased. When m = M, the standard rotation speed V is not corrected.

Thus, each acceleration time Tb in the acceleration mode b
When 1, Tb2, tb have elapsed, the mode is changed to the constant speed mode c. At that time, a rotational speed cancellation signal at the time of correction acceleration is output from the computing unit 19 to the drive motor 14, and the rotational speed of the motor is switched to the standard rotational speed V.

In the constant speed mode c, since the inertial force by the flywheel 6 does not act, the constant speed time tc is constant regardless of the mass of the test vehicle 4, and when the constant speed time tc has elapsed, the deceleration mode is set. Move to d. At that time, the rotational speed signal of the corrected deceleration based on the corrected deceleration time is output from the computing unit 19 to the drive motor 14, and the rotational speed of the motor 14 is switched.

That is, the corrected deceleration time Td is defined as follows: where the equivalent inertial mass of the flywheel 6 is m, the mass of the test vehicle 4 is M, and the deceleration time in the target traveling pattern 16 is td.
It is corrected to Td = (m / M) td. Therefore, m <
When M, Td1 <td is corrected as shown by the broken line in FIG. 3, and when m> M, Td2> as shown by the chain line in FIG.
It is modified to td. When m = M, the deceleration time t
d is not modified.

Therefore, the corrected deceleration rotational speed Vd of the drive motor 14 is inversely proportional to the ratio between the corrected deceleration time Td and the deceleration time td, where V is the standard rotational speed.
= (Td / Td) V. Therefore, m <M
In case of, Vd> V is corrected, and in case of m> M, Vd> V
Corrected to d <V. When m = M, the standard rotation speed V is not corrected.

In this way, this embodiment shares the same flywheel 6 regardless of the mass of the test vehicle 4,
The deviation between the mass m of the flywheel 6 and the mass of the test vehicle 4 due to this is corrected in proportion to their ratio to correct the acceleration / deceleration operating time, and the acceleration / deceleration is equivalently corrected. Rotating speed is changed, chart sheet 15
It corresponds by changing the feed rate of.

Therefore, the accelerator opening of the test vehicle 4 is
Since the test method is approximated to the conventional test method, that is, the test method based on the target traveling pattern 16, both driving conditions are equivalent, and the composition of the exhaust gas discharged from the test vehicle 4 can be treated equally.

[0055]

As described above, according to the driver's aid display device of the present invention, when the test vehicle is accelerated or decelerated, the feed rate of the time axis of the chart sheet is made variable according to the mass of the test vehicle. It is possible to adapt to a new chassis dynamometer test method that is performed by approximating the accelerator opening degree to the target traveling pattern. Further, the present invention, the moving speed of the index chart sheet in the time axis direction is made variable according to the mass of the test vehicle during the acceleration / deceleration mode of the running pattern, and instead of transferring the chart sheet in the time axis direction, Since the time axis and the velocity axis are moved in the XY directions, it is possible to provide a new device substantially equivalent to the device for transferring the chart sheet. Furthermore, the present invention provides a chart sheet in which the acceleration / deceleration time or the acceleration / deceleration in the acceleration / deceleration mode of the traveling pattern is corrected according to the mass of the test vehicle, and the sheet or index is moved in the time axis direction at a constant speed. The configuration of this type of device can be simplified.

[Brief description of drawings]

FIG. 1 is a perspective view showing a chassis dynamometer test situation using the present invention.

FIG. 2 is an explanatory diagram showing a main part of the present invention.

FIG. 3 is a chart showing a traveling pattern of the present invention.

FIG. 4 is a front view showing a main part of another embodiment of the present invention.

5 is a cross-sectional view taken along the line AA of FIG.

FIG. 6 is a view on arrow B of FIG.

[Explanation of symbols]

 4 Test vehicle 8 Driver's aid display device 15 Chart sheet 16 Running pattern 17 Index a Acceleration mode d Deceleration mode

Claims (3)

[Claims] 1. A driver's aid display device equipped with a chart sheet having a running pattern and an index movable in a direction orthogonal to a time axis direction of the chart sheet in association with a running speed of a test vehicle. A driver's aid display device characterized in that the feed rate on the time axis of the chart sheet is made variable according to the mass of the test vehicle during vehicle acceleration / deceleration. 2. A driver's aid display device comprising a chart sheet having a running pattern and an index movable in a direction orthogonal to a time axis direction of the chart sheet in association with a running speed of a test vehicle, A driver's aid display device characterized in that the moving speed of the index in the time axis direction is made variable according to the mass of the test vehicle in the acceleration / deceleration mode of the traveling pattern. 3. A driver's aid display device comprising a chart sheet having a running pattern and an index movable in a direction orthogonal to a time axis direction of the chart sheet in association with a running speed of a test vehicle, A driver characterized by providing a chart sheet in which the acceleration / deceleration time or acceleration / deceleration in the pattern acceleration / deceleration mode is corrected according to the mass of the test vehicle, and the sheet or index can be moved in the time axis direction at a constant speed. Z-aid display device.