JPH0541866B2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention detects that a vehicle is in a driving state (including an engine driving state, the same shall apply hereinafter) in which the gear position of a manual transmission of a vehicle should be shifted, and issues a gear shift instruction. Concerning shift instruction method.

BACKGROUND ART By appropriately selecting the gear position of a manual transmission according to the load of the vehicle, etc., it is possible to improve not only the mode fuel efficiency of the vehicle but also the actual driving fuel efficiency in the market. For this reason, conventionally, a shift instruction device monitors engine speed, throttle opening, and other parameters indicating engine operating conditions, that is, engine operating parameters, and accordingly indicates that the vehicle is in an operating state in which upshifting or downshifting is required. (For example, see Japanese Patent Application Laid-Open No. 55-31671)
is proposed.

By the way, engine output generally tends to decrease at high altitudes. For this reason, in highlands,
For example, if the shift-up point, which is the criterion for determining the shift instruction for the gear position of a manual transmission, is set to be the same as the low-lying point, the engine rotation speed after the shift-up is likely to be low, resulting in poor drivability. Another possibility is to increase the shift-up standard vehicle speed in accordance with the drop in engine temperature, but in extremely low temperatures,
If the pressure is further increased depending on the atmospheric pressure, the drivability tends to deteriorate.

Summary of the invention The present invention has been made in view of the above points, and
The purpose of the present invention is to provide a shift instruction method for a manual transmission that can ensure drivability by using engine output.

The shift instruction method for a manual transmission according to the present invention includes:
Detects vehicle speed and operating parameters of the engine installed in the vehicle, sets a reference vehicle speed for discrimination according to the detected operating parameters, and issues a shift instruction based on a comparison result between the detected vehicle speed and the reference vehicle speed for discrimination. In addition, the present invention is characterized in that atmospheric pressure is detected, and the discrimination reference vehicle speed is corrected to a higher speed side in accordance with a decrease in the detected atmospheric pressure.

Embodiments Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a block diagram showing a system to which the shift instruction method according to the present invention is applied, and the system includes a control circuit 1 comprising a microcomputer.
controlled by. The control circuit 1 is supplied with outputs from a vehicle speed sensor 2, an engine speed sensor 3, an atmospheric pressure sensor 4, a negative pressure sensor 5, a coolant temperature sensor 6, and an intake temperature switch 7. The engine speed, engine intake pipe negative pressure, cooling water temperature, intake air temperature, etc. detected by these sensors other than the vehicle speed sensor 2 are parameters indicating the operating status of the engine, and are collectively referred to as engine operating parameters. The vehicle speed sensor 2 generates frequency pulses corresponding to the vehicle speed V, and is comprised of, for example, a reed switch installed in a speedometer (not shown) and generating four pulses per revolution of the speedometer cable. The engine rotation speed sensor 3 generates a frequency pulse according to the engine rotation speed Ne in synchronization with, for example, ignition timing. Atmospheric pressure sensor 4 is atmospheric pressure
Generates analog output at a level corresponding to P _A.
The negative pressure sensor 5 generates an analog output at a level corresponding to the negative pressure P _B in the intake pipe downstream of the throttle valve of the internal combustion engine (not shown). The coolant temperature sensor 6 generates an analog output at a level corresponding to the engine coolant temperature _TW . The intake temperature switch 7 is turned ON when the intake temperature T _A in the intake pipe of the engine becomes lower than a predetermined determination reference intake temperature Tb (for example, 15° C.).

The control circuit 1 performs digital arithmetic processing.
It has a CPU (central processing circuit) 8. This CPU
An input/output bus 9 is connected to the CPU 8, and data signals and address signals are input to and output from the CPU 8 via the input/output bus 9. Input/output bus 9
includes a digital input module 10, MPX (multiplexer) 11, and ROM (read-only).
A drive circuit 1 that drives a RAM (random access memory) 12, a RAM (random access memory) 13, and a lamp 14 that displays a gear position, for example, a shift-up instruction.
5 are connected to each other. MPX11 is the various sensors 2 to 6 that are input via the level correction circuit 16.
and one of each output signal of switch 7.
This is a switch that selectively relays and supplies instructions from the CPU 8 to the digital input module 10. CPU
8 is supplied with clock pulses from a clock generator 17 via a frequency divider 18.

Furthermore, CPU8 has a built-in timer _TO .
The timer has a down counter configuration that starts counting down when it is set.

With this configuration, the control circuit 1 determines the driving state of the vehicle based on the output signals of the various sensors 2 to 6 and the switch 7 according to a program to be described later, and controls the manual operation by turning on the lamp 14. It performs control to instruct the driver to shift up the gear position of the transmission.

Next, the procedure of the shift instruction method according to the present invention executed by this control circuit 1 will be explained in FIGS. 2A to 2D.
This will be explained according to the operation flowchart.

In FIG. 2A, after initialization (step 20), it is activated at a predetermined cycle (for example, every 20 msec), first reads out the vehicle speed V stored in the RAM 13 (step 21), and then similarly stores it in the RAM 13. Read out the stored engine speed Ne (step 22). The vehicle speed V and engine speed Ne are stored in the RAM 13 in the following manner. That is, the pulse from the V sensor 2 is also input to the CPU 8 as an interrupt signal, and the CPU 8 measures the time between the current and previous pulses for each interrupt, and calculates the pulse a predetermined number of times (for example, 4 times) during that measurement time. The average value of is calculated and stored in the RAM 13. The pulse from Ne sensor 3 also becomes an interrupt signal for CPU 8,
In the same way as V sensor 2, the average value of rotation speed is RAM
13. Next, each analog output of the P _A sensor 4, P _B sensor 5, and T _W sensor 6 and the on/off output of the T _A switch 7 are read out at predetermined intervals (for example, 400 msec) longer than the startup cycle (step 23). Then, the gear position K (=Ne/V) is calculated (step 24).

Next, in FIG. 2B, the atmospheric pressure P _A obtained from the output of the P _A sensor 4 is the determination reference atmospheric pressure P _A1
(e.g. 500mmHg), P _A2 (e.g. 575mmHg),
P _A3 (e.g. 650mmHg) and P _A4 (e.g. 700
mmHg) (steps 26 to 29). When the atmospheric pressure is determined, corresponding to each determined atmospheric pressure _PA , determination reference vehicle speeds V _O12 , V _O14 to _{V O18} , according to the driving mode and gear position of the vehicle are determined.
V _O22 , V _O24 ~V _O28 , V _O32 , V _O34 ~ _{V O38} and
Each data value of _VO42 , _VO44 to _VO48 is set as shown in FIG. 2B (steps 30 to 34). Discrimination reference vehicle speed V _O12 , V _O14 ~ _{V O18} , V _O22 , V _O24 ~ _{V O28} ,
V _O32 , V _O34 to V _O38 and V _O42 , V _O44 to V _O48 are set so that they decrease as the atmospheric pressure P _A increases, and the settings are shown in stages, but they cannot be set continuously. It's okay. Note that the discrimination reference vehicle speeds V _O11 , V _O21 , V _O31 , V _O41 and V _O13 , which correspond to specific driving modes,
Regarding _VO23 , _VO33 , and _VO43 , data values are not set according to atmospheric pressure.

In FIG. 2C, the current gear position is determined depending on whether K is within a predetermined width (step 35).
~38), for each gear position, the determination standard vehicle speed V _O (V _O1 ~
V _O4 ) is set (steps 39 to 42). and,
The cooling water temperature T _W is set to a predetermined discrimination reference temperature Ta (for example,
75°C) or higher (step
43), if T _W ≧Ta, the so-called HOT mode,
If T _W <Ta, it is assumed to be a so-called COLD mode. In COLD mode (T _W < Ta), vehicle speed V
The difference ΔV between the current value and the previous value is a predetermined value Va (for example,
0.5 mile/h) or more (step 44), and if ΔV≧Va, the vehicle is accelerating, and whether the T _A switch 7 is ON or not, that is, the intake temperature T _A is a predetermined discrimination reference intake temperature Tb (for example,
15° C.) or lower (step 45). If T _A switch 7 is ON, 1st gear ~
Predetermined data values V _O11 , V _O21 , V _O31 , and V _O41 are sequentially set as the discrimination reference vehicle speeds V _O1 to V _O4 in 4th gear (step 46), and if the T _A switch 7 is OFF,
Data set in any of steps 30 to 34 according to atmospheric pressure P _A as discrimination reference vehicle speed V _O1 to V _O4
VO12 , _VO22 , _VO32 , and _VO42 are set in sequence (step 47). In addition, the data value in step 46
V _O11 , V _O21 , V _O31 , and V _O41 are set higher than the data values V _O12 , V _O22 , V _O32 , and V _O42 at step 47 .

On the other hand, if it is determined in step 34 that ΔV<Va, it is then determined whether |ΔV|≦Va (step 36), and if |ΔV|≦Va, it is cruise time, and T It is determined whether the _A switch 6 is ON or not (step 49). If the T _A switch 6 is _ON , predetermined data values V _O13 , _{V O23 ,}
V _O33 and V _O43 are set sequentially (step 50), and if T _A switch 6 is OFF, the discrimination reference vehicle speed V _O1 ~ _{V O4}
As, the data values V _O14 , V _O24 , V _O34 , set in any of steps 30 to 34 according to the atmospheric pressure P _A
V _O44 is set in sequence (step 51). Note that the data values V _O13 , V _O23 , V _O33 ,
V _O43 is the data value V _O14 , V _O24 ,
It is set higher than V _O34 and V _O44 .

Even in HOT mode (T _W ≧Ta), COLD
Similarly to the mode, it is determined whether ΔV is greater than or equal to the predetermined value Va (step 52), and ΔV≧
If Va, the vehicle is accelerating, and it is determined whether the negative pressure P _B is greater than a predetermined pressure Pa (for example, -150 mmHg) (step 53). P _B > Pa
If so, it is during sudden acceleration, for example, a 2sec timer.
_TO is set (step 54), and then 1st to 4th gears are set.
The data values V _O15 , V _O25 , V _O35 , and V _O45 set in any one of steps 30 to 34 according to the atmospheric pressure _PA are set as the reference vehicle speeds V _O1 to V _O4 at the same speed (step 55). ). On the other hand, if P _B ≦Pa, the acceleration is gradual, and it is determined whether the count value of the timer T _O is equal to 0 (T _O = 0), that is, the transition from rapid acceleration to gradual acceleration is being made. It is determined whether the process has continued for 2 seconds or more (step 56). _TO ≠0
If so, there is a possibility of sudden acceleration, so step 55
to move to. If T _O = 0, atmospheric pressure is used as the discrimination reference vehicle speed V _O1 to V _O4 in 1st to 4th gear
The data values _VO16 , _VO26 , _VO36 , and _VO46 set in any one of steps 30 to 34 are sequentially set according to P _A (step 57). Note that the data values V _O15 , V _O25 , V _O35 , and V _O45 in step 55 are the same as those in step 57.
It is set higher than the data values V _O16 , V _O26 , V _O36 , and V _O46 in .

When it is determined in step 52 that ΔV<Va, it is then determined whether |ΔV|≦Va (step 58). If |ΔV|≦Va, it is cruise time, and the negative pressure P _B is the specified pressure Pa (e.g. -150mm
A determination is made as to whether it is greater than Hg) (step 59). If P _B > Pa, a timer T _O of, for example, 2 seconds is set (step 60), and then the determination reference vehicle speeds V _O1 to V _O4 in 1st to 4th gears are set in steps 30 to 34 according to the atmospheric pressure P _A. The data values _VO17 , _VO27 , _VO37 , and _VO47 set in any of the above are sequentially set (step 61). On the other hand, if P _B ≦Pa, it is determined whether the count value of timer T _O is equal to 0 (T _O = 0) (step
62). And if T _O ≠ 0, step 61
If T _O = 0, the data value V _O18 , set in any one of steps 30 to 34 according to the atmospheric pressure P _A is used as the discrimination reference vehicle speed V _O1 to V _O4 in 1st to 4th gears. V _O28 , V _O38 , and V _O48 are set in sequence (step 63). In addition, the data value in step 61
V _O17 , V _O27 , V _O37 , and V _O47 are set higher than the data values V _O18 , V _O28 , V _O38 , and V _O48 in step 63.

In the setting of the above-mentioned discrimination reference vehicle speeds V _O1 to V _O4 , in the case of COLD mode (T _W < Ta),
The determination reference vehicle speeds V _O1 to V _O4 are set to be higher than those in the HOT mode ( _TW < Ta).
In addition, by setting the discrimination reference vehicle speeds V _O1 to V _O4 described above, in the COLD mode, the T _A switch 6
is ON, that is, when the intake air temperature T _A is lower than the discrimination reference intake air temperature Tb, which is set lower than the discrimination reference temperature Ta, the discrimination reference vehicle speeds V _O1 to V _O4 are set even higher.

By the way, as explained in steps 30 to 34, the determination reference vehicle speed V _O11 corresponding to a specific driving mode, that is, the extremely low temperature of the engine where T _A < Tb,
V _O21 , V _O31 , V _O41 and V _O13 , V _O23 , V _O33 , V _O43
Regarding this, data values are not set according to the atmospheric pressure, so when the engine is at an extremely low temperature, the determination reference vehicle speed will not be corrected to the high speed side based on the atmospheric pressure P _A. However, when the engine is operated at extremely low temperatures, the reference vehicle speed is sufficiently high, so drivability can be ensured without atmospheric pressure correction.

In this way, when the determination reference vehicle speeds V _O1 to V _O4 at each gear position (1st to 4th gear) are set,
In FIG. 2D, it is determined whether the vehicle speed V at each gear position is greater than the determination reference vehicle speed V _O (V _O1 to V _O4 ) (step 64), and if V>V _O , then other It is determined whether or not the shift-up condition is satisfied (step 65). If the condition is satisfied, it is assumed that the operating state is such that a shift-up condition is required, and T _ON is continued for a predetermined period of time from the establishment of the shift-up condition.
It is determined whether or not the time has elapsed. (Step 66). Then, if the predetermined time T _ON has elapsed, a lamp lighting command is issued to the drive circuit 15 and the shift-up lamp 14 is lit (step 67), and if the predetermined time T _ON has not elapsed, the drive circuit circuit 1
Lamp 1 is turned on by the lamp lighting stop command for 5.
4 is turned off (step 68). That is,
If the shift-up condition is no longer satisfied before the predetermined time T _ON elapses after the shift-up condition is satisfied, the lamp 14 will not be lit.

On the other hand, if it is determined in steps 35 to 38 that the gear position is not 1st to 4th gear, that is, if it is determined to be neutral or 5th gear, steps 48 and
If |ΔV|>Va is determined in step 58, that is, in the case of deceleration, if V≦V _O is determined in step 64, or if it is determined in step 65 that other shift-up conditions are not satisfied. Then, the process moves to step 69, where it is determined whether or not a predetermined time T _OFF has elapsed since entering this loop. When the predetermined time T _OFF has elapsed, the process moves to step 68 and lighting of the lamp 14 is stopped. If the predetermined time T _OFF has not elapsed, the process moves to step 67 and the lighting state of the lamp 14 is continued.

Here, if the predetermined time T _OFF is set shorter than the predetermined time T _ON , the opportunities for the lamp 14 to turn on will be reduced. Even if it is, it is not the optimal driving range, so turning off the lamp 14 has the effect of forcing the vehicle to operate so that the driving state is in the optimal driving range for upshifting.

In the above embodiment, the atmospheric pressure was detected using the P _A sensor 4, but in a system having an absolute pressure sensor that detects the absolute pressure inside the intake pipe, the absolute pressure sensor can also be used to detect the specific operating range of the engine. The atmospheric pressure may be determined based on the absolute pressure in the intake pipe at . As a method for determining the atmospheric pressure based on the absolute pressure in the intake pipe in a specific operating range of the engine, for example, the method disclosed in Japanese Patent Application Laid-Open No. 58-65950 can be used.

Further, in the above embodiment, the case where the gear position of the manual transmission is shifted up is explained, but the same setting can be made for the gear position of the manual transmission.

Effects of the Invention As explained above, according to the shift instruction method according to the first invention, the determination reference vehicle speed is set to the high speed side as the atmospheric pressure decreases, so the engine output can be used effectively and the This will ensure sex. .

Further, according to the shift instruction method according to the second invention, in addition to the above-mentioned effects, when the engine is operated at low temperature, the determination reference vehicle speed is sufficiently high, so drivability can be ensured without atmospheric pressure correction. .

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a system to which the shift instruction method according to the present invention is applied, and FIGS. 2A to 2D are flowcharts showing the steps of the shift instruction method according to the present invention. Explanation of symbols of main parts, 1... Control circuit, 2...
...Vehicle speed sensor, 3...Engine speed sensor, 4
... Atmospheric pressure sensor, 5 ... Negative pressure sensor, 6 ... Cooling water temperature sensor, 7 ... Intake temperature sensor, 14 ... Shift-up lamp.

Claims (1)

[Scope of Claims] 1. A shift instruction method for instructing a gear position shift of a manual transmission according to the driving state of a vehicle equipped with a manual transmission, the method comprising: a vehicle speed and an operation of an engine mounted on the vehicle; detects the parameters, sets a discrimination reference vehicle speed according to the detected driving parameters, compares the detected vehicle speed with the discrimination reference vehicle speed, issues a shift instruction based on the comparison result, and detects atmospheric pressure. . A shift instruction method for a manual transmission, characterized in that the discrimination reference vehicle speed is corrected to a higher speed side in accordance with a decrease in atmospheric pressure. 2. A shift instruction method for instructing a gear position shift of a manual transmission according to the operating state of a vehicle equipped with a manual transmission, the method comprising: detecting vehicle speed and operating parameters of an engine installed in the vehicle; It sets a discrimination reference vehicle speed according to the determined driving parameters, compares the detected vehicle speed with the discrimination reference vehicle speed, issues a shift instruction based on the comparison result, detects atmospheric pressure and engine temperature, and detects atmospheric pressure and engine temperature. The discrimination reference vehicle speed is corrected to the high speed side in response to a decrease in the engine temperature, and the discrimination reference vehicle speed is corrected to the high speed side in response to a decrease in engine temperature. A method for instructing a shift in a manual transmission, characterized in that the shift instruction is not executed.