JPS5926332A - Shift indicator for vehicle with manual transmission - Google Patents

Abstract

PURPOSE:To improve driving performance, by decreasing a threshold value for the revolution speed of an engine, through which shift-up is detected in terms of the increase in the rotational acceleration of the engine, and by indicating the shift-up when a revolution speed predetermined in consideration of the time lag after shifting operation is reached. CONSTITUTION:When acceleration is effected in driving with gears in the low position, the revolution speed N of an engine detected by a revolution speed sensor 2 is differentiated by a differentiator 10 and a threshold value setting unit 12 performs a calculation of NS1=N0-kN1 (NS1 denotes a threshold value, N0 denotes a threshold value at the time when the revolution speed of the engine becomes constant) on the basis of the output of the differentiator which corresponds to the rotational acceleration N1 of the engine. As a result, the threshold value NS1 by kN1 smaller than N0 is set in a comparator 4 depending on the magnitude of the rotational acceleration N1. When the revolution speed N has reached the threshold value NS1, the comparator 4 generates a high output to operate a shift-up display 6 on condition that the degree theta of opening of a throttle is within a range of thetaL-thetaH set in a comparator 3, to indicate shift-up.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shift indicator for a vehicle with a manual transmission that informs a driver of gear shift information for economical driving with low fuel consumption while maintaining power performance.

Conventionally, as this type of shift indicator, there is one shown in FIG. 1, for example.

In Fig. 1, 1 is a throttle opening sensor for detecting the engine's conscious state, 2 is an engine rotational speed IJc sensor for detecting the engine rotational speed, and the opening θ detected by the throttle opening sensor l is compared. Throttle opening sensor When the detected opening from 1 is within the range between the F limit opening θL and the upper limit opening θIN, that is, 0L≦θ≦θH, the comparator 3 generates an H level output.On the other hand, the output of the engine rotation speed sensor 2 is comparator 4
is input to the comparator 4, and the upper limit Ns of the engine rotation speed at which economical operation becomes iTJ function is inputted to the comparator 4, for example, Ns = 2000
rpln is set as a threshold 11, and when the engine speed N is greater than or equal to the threshold (i1iNs, that is, N≧Ns), the comparator 4 produces an I-Level output.

The outputs of the comparators 3 and 4 are input to the AND gate 5, and when the throttle opening θ is θL≦θ≦θU and the engine speed N is N≧NS, the AND gate 5 generates an II level output and shifts - The upshift indicator 6 is activated to notify the driver of upshifting using a lamp, buzzer, or the like.

The second objective is to improve fuel efficiency with such a shift indicator.
To explain the engine total performance curve diagram in Figure 2, from the engine total performance curve diagram in Figure 2, the range of throttle opening that enables economical operation without impairing power performance is 0L-J.
7o (3'll is 10~40), and the engine speed N3, which is the upper limit for economical operation, is Ns -200.
Orpm, the diagonally shaded range in FIG. 2 is the driving range that allows economical driving.

Therefore, suppose the power required to drive the vehicle is 10 ps.
At this time, the engine rotational speed IJj N is N+ = 2000 rpm, i52
Figure 2 shows the point A on the power curve 10 ps and the fuel consumption at point A is 4+11.
From the equal fuel consumption rate curve shown by vli, approximately 350 [y/1
1sit:].

In the operating state at this point A, the throttle opening 0I is θ
L≦θ1≦θH, and the engine rotation speed N1 is also N
, ≧Ns, the comparator 3 shown in FIG.
4 produces an H level output, and the shift-up indicator 6 displays a shift-up. Therefore, if the driver performs a shift-up operation according to this shift-up display, the engine speed after the shift-up will decrease to N2 based on the change rate of the gear ratio when the shift knob is pressed, and the same power of 10 ps will be obtained. The state shifts to point 13 on the Kasa power curve. The fuel consumption at point B after this upshift is 3ooC! /ps・b),
Economical driving can be achieved without sacrificing power performance by shifting according to upshift instructions.

By the way, in the 77 shift operation in accordance with the shift-up display by the shift indicator, there is a slight time delay between the shift-up display and the actual shift-up from -C.

For example, as shown in Fig. 3, when the engine speed N reaches the threshold value N8 and C
When the engine speed drops due to shift amplifier operation after the shift-up display is performed, approximately the same time delay Δt occurs for each shift-up, and therefore, the engine speed increases, and for the 77 r knob on the low speed side, However, there is a problem in that the engine speed greatly exceeds the threshold value Ns that requires upshifting by the time the upshifting is performed, and the effect of improving fuel efficiency is lost due to the delay in the upshifting operation.

The present invention has been made in view of such conventional problems, and provides a shift-up display that does not lose the effect of improving fuel efficiency even if there is a time delay in the shift-up operation according to the shift-up display. To achieve this purpose, as the engine rotational acceleration increases -C
The threshold value of the engine speed for determining shift) is lowered at a predetermined rate, and when the engine speed reaches an engine speed that takes into account the time delay of the shift operation, a shift-up display is commanded.

Hereinafter, the present invention will be explained based on the drawings.

FIG. 4 is a block diagram showing the basic configuration of the present invention.

First, to explain the configuration, 1 is a throttle opening sensor, which is a combination of a potentiometer and a constant voltage source.
An F--converter is used that converts the ignition pulse signal of the voltage ignition coil into voltage, which is proportional to the throttle opening θ.

3 and 4 are comparators, and the comparator 3 is set with an upper limit value θl (and a lower limit value θL) of the throttle opening degree θ, so that the detected opening degree θ of the throttle opening degree sensor 1 is θL≦θ≦θ!! Time, H
Produces level output. Further, a threshold value Ns is set for the comparator 4 by a threshold value setting device 12 which will be explained later, and the detected rotation speed N of the engine rotation speed sensor 2 is set to a threshold value Ns.
When N≧Ns 0, 1 level output is produced.

Each output of the comparators 3 and 4 is input connected to an AND gate 5, and the output of the AND gate 5 is given to a shift-up indicator 6.
It is configured to operate with a four-level output and notify the driver of upshifting by lighting a lamp or sounding a buzzer.

This configuration is the same as the conventional device shown in FIG.
In addition, the present invention is provided with a differentiator 10 that differentiates the rotational speed N detected by the engine rotational speed sensor 2 to detect the rotational acceleration, that is, the engine rotational acceleration N, and the differential output of the differentiator 10, that is, the engine Input the rotational acceleration N to the threshold value setter 12, and set the threshold value Nll in the comparator 4 in the threshold value setter 12 as N5=No-kN.
I am trying to calculate.

That is, the threshold value setter 12 subtracts the value obtained by multiplying the engine rotational acceleration N by a coefficient 1 from the fixedly set limit value No. of the engine rotational speed that enables economical operation, and sets the threshold value N8 for the comparator 4. is set, and the threshold value NS becomes a value that decreases at a rate determined by a coefficient in accordance with an increase in the engine rotational acceleration IAI~N.

FIG. 5 is a circuit block diagram illustrating an embodiment of the present invention in which the comparator 3.4, the differentiator 10, and the threshold value setter 12 in FIG. In Fig. 5, the comparator 3 is provided with a so-called wind converter consisting of operational amplifiers A, , A, and the positive voltage of the operational amplifier A is the resistor It, , Peng. The reference voltage V0II corresponding to the upper limit θH of the throttle tiilg determined by the divided voltage is set, and the reference corresponding to the lower limit θL of the throttle opening θ The voltage vOL is the resistance It, ,
It is set by the divided voltage of R4.

A is the detection '1 [1, river ■θ] of the throttle opening sensor 1.
When is within the range of the reference voltage V (h, ~■θH, an H level output is produced. It is connected.

Further, the comparator 4 is composed of an operational amplifier A, and receives the detected voltage V of the engine speed sensor 2 via an input resistor It.
N, input the output of the threshold value setter 12 via the resistor I-, and set the output of the threshold value setter 12 as the reference voltage, so that the detected voltage VN of the engine rotation speed sensor 2 becomes equal to or higher than the reference value. At times, an H level output is generated.

On the other hand, the differentiator 10 receives the negative input of the operational amplifier.
The circuit is equipped with a differential circuit in which a resistor 1 (7) and a condenser C1 are connected in series, and the rate of increase in the detection voltage VN per engine rotational speed 1r, that is, proportional to the engine rotational acceleration, is provided. Outputs differential voltage -VkN.

Furthermore, the threshold value setter 12 is composed of an adder circuit using an operational amplifier A, and an inverter using an operational amplifier A6, and connects the output of the differentiator 10 to 1 through a resistor l- to the negative input terminal of the operational amplifier A. , resistance It, o,
The set voltage VNO corresponding to the upper limit NO of the engine rotation speed that allows economical operation determined by the partial voltage of It, is set by the resistor R.
1 and 12, an addition output of -(VNO-VkN) is obtained from the operational amplifier A, which is inverted by the inverter connected to the operational amplifier and sent to the comparator 4 (VNO-VkN). Outputs an IQ value of 1 degree. It is structured in a similar way.

FIG. 6 shows the differential output of the Ill separator 10 in the implementation of FIGS. 4 and 5 (fl), that is, the engine rotation acceleration ^
It is a graph diagram showing the relationship between the threshold value Ns calculated by the threshold value setter 12 based on the engine rotational acceleration ^, and as the engine rotational acceleration 1rrN increases, the engine rotational speed is constant <r, The threshold value NS is set to decrease with the initial value of the threshold value No.

Next, the time axis representing the engine rotational speed according to the upshift operation χJ on the time axis in Figure 7? The present invention will be described in detail with reference to the following figures.

First, when accelerating a general vehicle, the driver often performs a driving operation to accelerate the vehicle by depressing the accelerator pedal a certain amount, so regardless of the gear position, the acceleration of the vehicle is often constant at #1 and #knee, and when using a low gear, the engine rotational acceleration increases.

Therefore, as shown in FIG. 7, when the gear is put into 1st gear and acceleration is performed, the engine rotational speed N4 detected by the engine rotational speed sensor 2 at this time is differentiated by the differentiator IO, and the differentiator 10 Threshold value setting HH based on output engine rotational acceleration N; Ns at 12, = No −kN,
The calculation of - is performed, and the engine speed is set to a small threshold value Ns.
, is set in the comparator 4, and the engine rotation speed N is the threshold value N
s, the comparator 4 generates an H level output, and the throttle opening θ at this time is between θL and θI set in the comparator 3.
When the signal is within the range of I, the AND gate 5 generates an H level output, activates the shift-up indicator 6, and notifies the driver of the shift-up using a lamp or a buzzer.

Assuming that the driver shifts up to 2nd speed in response to this shift-up display, there is a time delay of Δt after the shift-up display is performed until the actual shift-up operation is performed, and this time delay ΔtKIJl− 1 In the present invention, the shift-up display is performed when the engine speed N reaches the threshold value Ns, which takes into account the time delay Δt.
The engine speed for economical driving is 1
(N0 = 200'Orpm set as the upper limit of
(This will be described in detail below.) When shifting up to 2nd gear, the upper limit of the engine rotational speed becomes less than 200 rpm.

Subsequently, even in the acceleration state in 2nd gear, a threshold value Ns is set based on the engine rotational acceleration N in 2nd gear, taking into account the time delay Δt of the shift operation, and the engine rotational speed N is set as the threshold value. When N52 is reached, a shift-up display is performed, and when the shift-up to 3rd gear is performed according to this shift amplifier display, the engine rotation speed N is the -1- limit of economical operation, which is the engine rotation speed No = 200 O.
It is possible to shift up to l speed near rpm j;

Similarly, the shift-up display from 3rd gear to 4th gear and from 4th gear to 15th gear is performed by setting the threshold values Ns, , Ns, which are calculated based on the engine rotational accelerations N, , N, - V. , due to the shift-up operation according to such a shift-up display, a delay time Δ1 occurs in the foot-up operation. It almost never exceeds NO, and it reliably prevents the effect of improving fuel efficiency from being diminished due to a time delay in upshifting.

Although the above-mentioned embodiment takes as an example a circuit configuration using a pair of amplifiers, the present invention is not limited to this, and the present invention is not limited to this. The shift-up display may be performed by program control of a micro combicoater or the like based on each output of the differentiator.

Further, in the above embodiment, the throttle opening 1f [sensor is used as a means for detecting the load state of the engine; however,
Instead of the throttle opening sensor, an intake negative pressure sensor or a sensor that detects accelerator pedal operation 14- may be used.The gear shift notification device of the present invention can be used not only for gasoline engines but also for diesel engines. Of course, it is also effective.

As explained above, in the present invention, l:;
', engine rotational acceleration) When the engine rotational speed decreases to a threshold value for determining shift 1-up as W increases, a shift-up is commanded when the engine rotational speed reaches a value that takes into account the time delay of the shift operation. -C/Since the shift-up display is displayed, even if there is a time delay before the driver performs the shift-up operation after seeing the shift-up display, the time delay h <+: r+', engine rotation at high speed. Based on the speed threshold - CC horn - ``Since the up display is commanded, the engine rotation speed that enables economical driving when performing an upshift operation is less than the upper limit.'' This system reliably prevents the effect of improving fuel efficiency due to a time delay in shift-up operations from being lost, and by performing shift-up operations according to the shift-up display, economical driving can be achieved without compromising 4iIII power performance. The effect is that it can be performed easily.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an example of a conventional device, Fig. 2 is a full engine performance curve showing the moving bed for improving fuel efficiency by shifting up, and Fig. 3 shows the change in engine rotation due to a time delay in upshifting. The time chart shown, No. 4
Figure 5 is a block diagram showing the basic configuration of the present invention, Figure 5 is a circuit block diagram showing an embodiment of the collective circuit configuration of the present invention, Figure 6 is the threshold value N for engine rotational acceleration 1N.
FIG. 7 is a graph diagram showing the relationship between s and FIG. 7, which is a cheat chart showing an example of a time change in engine rotation caused by shift amplifier operation according to the shift-up display of the present invention. 1...Throttle 1jF41Jt sensor 2...-Engine speed sensor 3.4...Comparator 5, 7...And gate 6.
- Shift amplifier indicator 10... Differentiator 12...
・Threshold value setting device patent Applicant 1: San Jidosha Co., Ltd. Patent attorney Hajime Tsuchihashi

Claims (1)

[Scope of Claims] Load condition determining means outputs an output when the detected value of the engine load sensor is within a predetermined range; and engine rotation determining means outputs when the detected speed of the engine rotation speed sensor exceeds a set threshold value. and acceleration detecting means for detecting engine rotational acceleration by differentiating the detected speed of the engine rotational speed sensor; calculating a threshold value that decreases at a predetermined rate in accordance with an increase in the detected acceleration of the acceleration detecting means; a threshold value setting means for setting a threshold value of the engine rotation determination means; a command means for commanding left-up when outputs from both the load state determination means and the engine rotation determination means are obtained; and a command for the command means. 1. A shift indicator for a vehicle with a manual transmission, comprising display means for indicating a shift up based on an output.