JPH04171352A - Judgement of gear position - Google Patents

Abstract

PURPOSE:To correctly judge the gear position from only the speed and the number of revolution of an engine even in deceleration by measuring the average value of the time variation quantity of the gear ratio obtained from the number of revolution of the engine and the speed and judging the gear position from the fact that the absolute value of the above described average value is over a threshold value or not. CONSTITUTION:A speed detecting means 10, engine revolution speed detecting means 20, and an intake pressure detecting means 40 are provided, and the average value of the time variation quantity of the gear ratio which is obtained from the number of revolution of an engine and the car speed, is measured by a control means 30, and the gear position is judged from the fact that the absolute value of this average value is over a threshold value or more, and the result is displayed by a display means 60. Accordingly, the gear position can be judged from the data of only the speed and the number of revolution of the engine, and the device can be installed in simple manner on a variety of transmission vehicles.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for determining a gear position, and particularly to a method for determining a gear position during deceleration.

[Conventional technology]

Conventionally, in order to determine the gear position, various methods shown below have been adopted.

a) Directly attaching a transmission position sensor to determine gear position.

b) A method for determining the gear position from the clutch switch and engine rotational speed and speed.

On the other hand, the gear ratio G is determined from the engine speed E and the speed S using the following equation.

G=to □ ...... ■ Here, k is a proportionality constant. The gear position was determined from this gear ratio G. However, in a manual transmission, as shown in FIG. 8, when the clutch is turned off, the relationship of equation 0 no longer holds, and G no longer converges to a constant value. So I installed a clutch switch and
When the clutch was not engaged, it was determined to be neutral.

[Problem to be solved by the invention]

However, in the above conventional example, when you want to measure and record the gear position of a car's manual transmission, in case a), since the shapes of car transmissions vary widely, it takes time and effort to manufacture a retrofitted swift. This had the disadvantage of being time consuming. Furthermore, in the case of b), the mounting position of the flange switch differs depending on the vehicle model, so there is a problem with the mounting jig and the mounting space.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for determining a gear position that can accurately determine the gear position from only the speed and engine rotational speed, especially during deceleration, by improving the disadvantages of the conventional example.

[Means to solve the problem]

Therefore, in the present invention, the average value of the amount of change over time in the gear ratio determined from the engine rotation speed and speed is measured, and the gear position is determined based on whether the absolute value of this value is greater than or equal to a certain threshold value. method is adopted. This aims to achieve the above-mentioned purpose.

(For use) (2) Find the amount of change in gear ratio over time ΔG.

Let S=S(t) be the speed S as a function of time t.

The engine speed E is the idling speed E when the clutch is off or in neutral. is equal to

Therefore, the gear ratio G is determined by the speed during deceleration, and is expressed by the following equation.

C=kEo-□ S (t) In inertia running, s (B continuously decreases and approaches 0, so G continuously increases. Therefore, the amount of time change in gear ratio ΔG is always positive and increasing. It will show a trend.

■Actually measured gear ratio data contains noise components. In order to remove this noise component, m
Average data.

2. It is checked whether the averaged gear ratio is within the gear range of the shift.

(2) If the averaged gear ratio is not within the gear range of the shift, it is determined that the vehicle is in neutral.

(2) If the averaged gear ratio is within the gear range of the shift, ±m/2 of the averaged gear ratio data from the data at time n are averaged.

n+m/2 Zn=Σ ΔCyi i=n-m/2+1 = Gn+m/2- Gn-m/2 (2) If Zn exceeds the threshold Zmax, it is determined to be neutral.

(2) If Zn is smaller than Zmax, the gear position is determined from the gear ratio.

C Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described based on FIGS. 1 to 7.

The embodiment shown in FIG. 1 is a speed detecting means 10 for determining the speed.
, an engine rotation speed detection means 20 for determining the engine rotation speed, an intake pressure detection means 40 for determining the intake pressure, and an interface 50 for outputting signals from these detection means to the control means 30. A keyboard 70 for an operator to input input into the control means 30 from the outside, a display means 60 for notifying the processing results of the control means 30, and an external recording means 80 for recording the processing results of the control means 30. It is composed of.

Here, a speed sensor is used as the speed detection means 10, a rotation speed sensor is used as the engine rotation speed detection means 20,
Although a pressure sensor is used as the intake pressure detection means 40, it is not limited to this.

As shown in FIG. 2, the interface 50 includes a speed interface 51 for adjusting the level of the digital signal from the speed sensor 10, and a rotation speed interface 52 for adjusting the level of the digital signal from the rotation speed sensor 20. , an intake pressure interface 53 for adjusting the level of the analog signal from the pressure sensor 40, and an AD converter 54 for converting the analog signal from the intake pressure interface 53 into a digital signal.

As the display means 60, as shown in FIG.
(Liquid Crystal Display
:liquid crystal display device), a memory card is used as the external recording means 80, but it is not limited to this.

The control means 30 includes a C for processing the signals from each sensor by applying them to a certain calculation formula as shown in FIG.
It is equipped with a PU 31, and further includes a ROM 32 storing a control program for operating the CPU 31, a real-time clock 34 for measuring time, and a buffer 33 for temporarily storing data to be written to the memory card 80. and a PIA 35 for taking in data from the keyboard 70 are on the lotus line of CP[J31. Data is also output to the LCD 60 through this lotus line.

Misjudgment of gear position most frequently occurs just before the vehicle decelerates, when the driver depresses the brake while the clutch is off or in neutral, as shown in FIG.

The driver takes his foot off the accelerator to brake and turns on the clutch at the same time, so the engine speed becomes close to the constant speed during idling.

Next, the operation of this embodiment will be explained with reference to the flowchart shown in FIG.

(A) Calculate the amount of change in gear ratio over time ΔG.

Let S=S(t) be the speed S as a function of time t.

The engine speed E is the idling speed E when the clutch is off or in neutral. is equal to

Therefore, the gear ratio G is determined by the speed during deceleration, and is expressed by the following equation.

G=kE, □ ・・・・・・ (2) S
(t) In inertia running, S (t) is continuously small (and approaches 0, so G is continuously large. Therefore, the amount of change in gear ratio over time ΔG is always positive and shows an increasing tendency. (510 in Figure 4).

(B) Actual measured gear ratio data is shown in Figure 7.

As shown in FIG. 8, it contains noise components.

In order to remove this noise component, m pieces of data before and after are averaged (520 in FIG. 4).

(C) It is checked whether the averaged gear ratio is within the gear range of the shift (530 in FIG. 4).

(D) If the averaged gear ratio is not within the shift gear range, it is determined that the gear is in neutral (340 in Figure 4).
).

(E) If the averaged gear ratio is within the gear range of the shift, attention is paid to changes in ΔG before and after time n with respect to the averaged gear ratio data.

ΔGn-1= Gn-1-Gn-2 ΔGn = Gn - Gn-1 +) ΔGn+l-Gn+1-〇n ΔGn-1+ΔGn+ΔGn+1= Gn+1-0n-
1... (3) The integrated value of ΔG (left side) in equation (3) is almost equal to 0 when the amount of time change in G (Gn+1-Gn-1) is 0, but becomes positive during deceleration. (850 in Figure 4).

(F) As shown in FIG. 5, when formula (3) is considered within the range of ±m72 averaged data from the data at time n, the following formula is obtained. Let this be Zn (360 in Figure 4).

n+v'2 Zn-Σ ΔGi n-m/2+1 = Gn+m/2-Gn-m/2 -- (4)(
G) Since Zn is approximately equal to O while the shift is fixed, a threshold value Zmax is determined appropriately, and when the threshold value is exceeded, it is determined to be neutral (870 in Fig. 4). .

If (H)Zn is smaller than Zmax, the gear position is determined from the gear ratio as shown in FIG. 6 (880 in FIG. 4).

〔Effect of the invention〕

As described above, according to the present invention, the average value of the amount of change over time in the gear ratio determined from the engine rotation speed and speed is measured, and the gear position is determined based on whether the absolute value of this value is greater than or equal to a certain threshold. Because this method is adopted, it is possible to more accurately determine the gear position from only the speed and engine revolution data.

Therefore, it is possible to provide an unprecedented and excellent gear position determination method that can be easily installed in a wide variety of manual transmission vehicles and can measure the usage status of the transmission only from the engine rotational speed and speed.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention, FIG. 2 is a detailed configuration diagram of the interface in FIG. 1, and FIG.
4 is a flowchart of gear position determination, FIG. 5 is an explanatory diagram showing an example of averaging processing, FIG. 6 is an example of gear ratio setting range, and FIG. 7 is during deceleration. An explanatory diagram showing an example of the changing state of the gear ratio in 1-
FIG. 7 is an explanatory diagram showing an example of a change state of a gear ratio when shifting up to the fifth speed. 10... Speed detection means, 20... Engine rotation speed detection means, 30... Control means, 40
...Intake pressure detection means, 50...Interface. Fig. 1 Fig. 2 5θC in 7 fries) Fig. 3 30 (Enlightenment Lord 1 Shi role) Fig. 4 Fig. 5 Fig. 6 Fig. 7 τ Fig. ε

Claims (1)

[Claims] (1) In a gear position determination method in which the gear position is determined based on the gear ratio determined from the engine rotational speed and speed during deceleration, the average value of the amount of change over time of the gear ratio is measured, and the absolute value of this value is determined in advance. A gear position determination method characterized in that the gear position is determined based on whether or not the gear position is equal to or higher than a predetermined threshold value.