JPS6181228A - Device for indicating optimum position of transmission - Google Patents

Abstract

PURPOSE:To enable a car to run smoothly and economically by computing the optimum position of the transmission by detecting both a car running condition and an engine operating condition allowing a shift operation to be directed with an indication displayed in accordance with the resultant of computation. CONSTITUTION:When a car is running, output data from a car speed sensor 10, a transmission position detecting sensor 11, a sensor 12 for the number of revolution of an engine, a load sensor 13, an acceleration sensor 14, and a weight sensor 15 are inputted into a microcomputer 16. Then, a running resistance R at the present position 8 of the transmission is computed first of all, subsequently, a tractive force F for the position which is one step over the present transmission position 8 is computed. In a comparison between R and F, if R is smaller than or equal to F, the computer permits a shift-up indicator 19 of an indicating section 17 to illuminate so that a shift-up operation should be directed allowing the position 8 of the transmission which can be shifted, to be flickered in an indicating section 18.

Description

[Detailed description of the invention]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for displaying the optimal position of a transmission installed in an automobile for changing the engine speed to an appropriate value and transmitting the speed to the driving wheels. K PRIOR ART Generally, automobiles are equipped with a transmission, which changes the engine speed to an appropriate value and transmits it to the drive wheels via a transmission means such as a propeller shaft. If such a transmission is not used properly, smooth running will be hindered or fuel efficiency will deteriorate. Generally, it is most preferable to use the transmission in the highest position where the vehicle can travel, and this can reduce fuel consumption. Therefore, based on experience and knowledge, drivers try to drive using the vehicle in the most efficient position as described above. According to this conventional method of using a transmission, if the driver is inexperienced or does not perform appropriate driving operations, the transmission will not necessarily be used in the optimal position, which will worsen fuel efficiency. Or, smooth driving may be hindered. In order to display whether or not the current driving condition is economical, for example, for commercial vehicles, attempts have been made to display whether or not the current driving condition is economical. At present, there is no display device that indicates that the device is in the optimal position for use.

[Purpose of the invention]

The present invention has been made in view of these problems, and it is an object of the present invention to provide an optimal transmission position display device that is most economical and allows for smooth running. [Structure of the Invention] The present invention includes a sensor that detects the running state of a vehicle and the operating state of an engine installed in the vehicle, and a calculation means that calculates an optimal transmission position based on the detection outputs of these sensors. , and display means for displaying whether the transmission is upshifting or downshifting based on the calculation means. This allows for smooth running. K Embodiment The present invention will be described below with reference to an illustrated embodiment. FIG. 1 shows an engine equipped with an optimal transmission position display device according to an embodiment of the present invention, and this engine is comprised of, for example, a diesel engine 1 for a truck. A fuel injection pump 2 is provided on the side of the engine 1. The fuel injection pump 2 is driven using a portion of the output of the engine 1 via a timer 3. In addition, the fuel injection pump 2 is equipped with a mechanical governor 4 on the rear side, and this governor 4 controls the control rack to 1 liter.
It2II is used to adjust the amount of fuel supplied. A load lever 5 is provided on the outer surface of the governor 4, and is connected to an accelerator pedal (not shown) via a wire cable 6. A flywheel housing 7 is provided on the rear side of the diesel engine 1. A flywheel fixed to the rear end of the crankshaft of the engine 1 is housed within the flywheel housing 7. A transmission 8 is installed behind the flywheel crank 7, and a transmission 8 is installed behind the 1-lance transmission 8. Throat 0 is extended. The transmission 8 is equipped with a medium speed sensor 1) 10, and on its upper surface are mounted a transmission position detection sensor 1-11 for detecting the gear position of the transmission 8. It is now possible to In addition, for example, on the front side of the engine 1, a carrot rotation speed detection sensor 12 is installed (=t t-1). In this example, I detects the load of engine 1.
Komeno [1-Dosen 4) 13 is taken] [There is a part of Nore. Furthermore, a vehicle equipped with this engine 1 is equipped with an acceleration sensor 14 and a weight detection sensor 4 and 15, respectively.
is connected to the input side of the microcomputer 1-16, and the outputs of the above-mentioned sensors 10 to 15 are input to the microphone computer 16. The output side of this microcomputer 16 is connected to a display device 17. Display device 1
7, as shown enlarged in FIG. 2, a display section 18 that displays each stage of the transmission 8, a shift-up display section 19 consisting of an upward arrow, and a shift-down display section 19 consisting of a downward arrow. 20. Next, the operation of this optimum position display device for a transmission having the above structure will be explained. Economical driving is achieved by selecting the optimal transmission position. Basically, if the vehicle can run in a gear higher than the current transmission position, the fuel efficiency will be best if the transmission 8 is shifted up and the vehicle travels in the highest driveable gear position. Therefore, the microcomputer 16 constituting the calculation means of this optimum position display device calculates whether the current position of the transmission 8 is optimum or not, and displays a corresponding display on the display device 1.
I try to do it by 7. First, the upshift operation is shown in Fig. 4.
To explain based on gears 1 to 1, the microcomputer 16 reads the detection outputs of the sensors 10 to 15 and calculates the running resistance R that is applied to the current transmission 80 position. 11 is the full traction force 1- of the gear one step higher than the current transmission 8 position.Then, which comparison is made with the above R, and if R is less than or equal to F, the upshift is performed. If 1 is less than or equal to 1, it indicates that it is possible to drive even if the gear is switched to 8 or higher, and the transmission will change based on the display. By switching 8 to the upper stage, the position of l-thin sewing machine 8 will be close to the optimum position. It is divided by the formula 1 shown in R = (W + △W ) (Z / (1 + WSin θ1
−μmΔv2+μ2W (1) In the following equation, α and V represent acceleration and vehicle speed, respectively. Further, W is the weight, A is the projected area as seen from the front of the vehicle, θ is the slope angle of the slope, μm and μ2 are the coefficients of air resistance and rolling resistance, respectively, and g is the gravitational acceleration. In this equation, the first term on the right side represents acceleration resistance, the second term represents climbing resistance, the third term represents air resistance, and the fourth term represents rolling resistance. When calculating R using equation (1) above, acceleration α,
Vehicle speed v, position of transmission 8, load of engine 1, and weight W are determined by sensor 14, sensor 10,
It will be detected by sensor 11, sensor 13, and sensor 15. On the other hand, since the slope θ of the hill on which the hill is being climbed cannot be measured by sensors, the position of the transmission 8 detected by the sensor 11 and the rotating position of the load lever 5 detected by the sensor 13 It is determined using the graph shown in FIG. The storage device of the microcomputer 16 stores the straight line shown in FIG. 3 for each stage of the transmission 8, and the slope θ is determined from this straight line and the acceleration detected by the acceleration sensor 14. , SiB6 is calculated by πi from this θ. Next, the calculation of the full tractive force F is as follows: F=T・η・R1・R2/D...(2) In this formula, King is torque, η is transmission efficiency, R1 and R2 are transmission 8J: difference The ratios of the dynamic gears are shown, and D shows the effective radius of the tires. In this calculation, the rotational speed of the engine 1 when the engine 1 is in a shuffle-up state at the current position of the transmission 8 is determined from the gear ratio. Since the maximum torque at this rotational speed of the engine 1 is stored in the microcomputer 16, the full tractive force F can be obtained by calculating equation (2). Next, the operation for displaying downshift will be explained based on the flowchart shown in FIG. First, the micro combination coater 16 reads the detection outputs of the sensors 10 to 15, and determines from the detection output of the sensor 13 whether the load lever 5 is at the full rotation position. When the load lever 5 is at the full rotation position, it is determined whether the rate of increase in the rotational speed of the engine 1 is equal to or higher than a certain value K rpm /800. The load lever 5 is in the full rotation position, and the rate of increase in the rotational speed of the engine 1 is Krt.
+m/sec or less means that the rotational speed of the engine 1 decreases even if the accelerator pedal is fully depressed, indicating that the vehicle speed cannot be maintained at the current transmission position. Therefore, in this case, the microcomputer 16 further determines whether the engine 1 will not exceed the maximum rotation speed even if the downshift is performed, and if it is determined that the engine 1 will not exceed the maximum rotation speed, the microcomputer 16 will shift down. I am trying to display the down status. On the other hand, when the load lever 5 is not in the full rotation position, the rate of increase in the rotational speed of the engine 1 is K rpm/sec.
In the above cases, and when there is a possibility that the number of revolutions of the engine 1 will exceed the maximum number of revolutions due to downshifting, there is no problem with driving even if you do not downshift, or it is possible to downshift again. Since this may cause inconveniences such as the possibility of damage to the engine 1, the downshift is not displayed as shown in FIG. As described above, the display device 17 displays a shift up or a downshift using the corresponding display sections 19 and 20, and in this case, the current position of the transmission 8 is displayed on the display section 18. At the same time, when it is possible to shift up to the upper stage, the shift-up display section 19 lights up, and furthermore, the position of the transmission 8 that can be shifted up is flashed in the display section 18. Therefore, the position of the transmission 8 can be easily changed from this display to the optimum position, and the transmission 8 can be switched to a state that provides smooth and most economical driving. Further, in the case of downshifting, the corresponding display 120 will be lit. Effects of the Invention I As described above, the present invention detects the running state of a vehicle and the operating state of the engine installed in this vehicle using sensors, and uses a calculation means to determine the optimum transmission based on the detection outputs of these sensors. The position of the transmission is calculated, and based on the calculation result, a display means is used to display whether the transmission is to be shifted up or down. Therefore, such a display device displays the optimal position of the transmission that is economical and allows for smooth running, thereby achieving ideal driving.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an optimal position display device for a transmission according to an embodiment of the present invention, FIG. 2 is an enlarged front view showing the display section of this display device, and FIG. 3 is a block diagram showing an optimum position display device for a transmission according to an embodiment of the invention. 4 is a flowchart showing the upshift operation, and FIG. 5 is a flowchart showing the downshift operation. In addition, in the symbols used in the drawings, 1...Diesel engine 2...Fuel injection pump 4...Mechanical governor 5...Load lever 8...Transmission 10...Vehicle speed sensor 11...Transmission position Detection sensor 12...
・Engine speed detection sensor 13...Load sensor 14...Acceleration sensor 15...Weight detection sensor 16...Microcomputer 17...Display device 18...Display section 19 at each stage... - Shift-up display section 20...This is a shift-down display section.

Claims (1)

[Claims] a sensor that detects the driving state of the vehicle and the operating state of the engine installed in the vehicle; a calculation means that calculates the optimum transmission position based on the detection outputs of these sensors; and a calculation means that calculates the optimum transmission position based on the calculation means. 1. An optimum position display device for a transmission, comprising display means for displaying shift up or down shift.