JPS6237225A - Shift indicating method for manual transmission - Google Patents

Abstract

PURPOSE:To secure good drivability at a low temperature range as well as to shorten a span of worming-up time, by setting a shift-up point or a criterion for shift indication to the high-speed side at a time when suction air temperature is lower than the criterion suction air temperature set to be lower than the criterion engine temperature. CONSTITUTION:A car speed V and a temperature TW of the engine mounted on a car both are detected, and when this detected engine temperature TW is lower than the criterion engine temperature, a criterion car speed should be set to be higher as compared with the case being high. And, on the basis of the compared result between this detected car speed and the said criterion car speed, shift indication is carried out. In addition, an engine suction air car speed, shift indication is carried out. In addition, an engine suction air temperature TA is detected, and when this detected suction air temperature TA is lower than the criterion suction air temperature set to be lower than the said criterion engine temperature, the criterion car speed is set to be yet higher. Therefore, even at a low temperature range, good drivability is securable, and worming-up time is also reducible. And, suction air temperature comes to a parameter which shows a state of atomization in a relatively accurate manner so that drivability is set better securable.

Description

[Detailed Description of the Invention] Technical Field The present invention detects that the vehicle is in an operating state (including engine operating 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 depending on 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, conventional methods have been used to monitor the engine speed and throttle opening and display the vehicle operating state in which upshifting or downshifting is required (Japanese Patent Laid-Open No. 55-31671).
(see Japanese Patent Application Laid-open No. 163929/1983), and a system that detects engine oil temperature and intake air temperature and displays a favorable fuel efficiency range accordingly.

By the way, when the temperature of the engine body is low, especially when good heating characteristics are required such as starting the engine from an extremely low temperature, it is lower than in the medium temperature range; This poses problems such as not being able to obtain sufficient oil pressure, and engine loss due to oil viscosity. Therefore, 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 in the low temperature range and the medium temperature range,
At low 114, drivability deteriorates, and the engine generates little heat, resulting in a delay in reaching warm shores.

Summary of the Invention The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a shift instruction method for a manual transmission that can ensure good drivability even in a low temperature range and also improve warm-up characteristics. .

The shift instruction method for a manual transmission according to the present invention detects the vehicle speed and the temperature of the engine installed in the vehicle, and when the detected engine temperature is lower than the determination reference engine temperature, the determination reference vehicle speed is determined. is set high, and a shift instruction is given based on the comparison result between the detected vehicle speed and the discrimination reference vehicle speed, and the engine intake temperature is detected.
The present invention is characterized in that when the detected intake air temperature is lower than the discrimination reference intake air temperature, which is set lower than the discrimination reference engine temperature, the discrimination reference vehicle speed is set even higher.

Example 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 a shift instruction method according to the present invention is applied, and the system is controlled by a control circuit 1 consisting of a microcomputer.

The control circuit 1 is supplied with outputs from a vehicle speed sensor 2 , an engine speed sensor 3 , a negative pressure sensor 4 , a coolant temperature sensor 5 , and an intake temperature switch 6 . 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 speed sensor 3 generates a frequency pulse corresponding to the engine speed Ne in synchronization with, for example, ignition timing. Negative pressure sensor 4 is an internal combustion engine (not shown)
An analog output of a level corresponding to the negative pressure P8 in the intake pipe downstream of the throttle valve is generated. The coolant temperature sensor 5 generates an analog output at a level corresponding to the engine coolant temperature Tw. The intake temperature switch 6 switches the intake temperature TA in the intake pipe of the engine to a predetermined determination reference intake temperature Tb (for example, 15
It turns ON when the temperature is below ℃).

The control circuit 1 has a CPU (central processing circuit) 7 that performs digital arithmetic processing. An input/output bus 8 is connected to the CPU 7, and data signals and address signals are input to and output from the CPU 7 via the input/output bus 8. The input/output bus 8 includes a digital input module 9.
, MPX (multiplexer) 10, ROM (read/
only memory) 11, RAM (random access)
A drive circuit 14 for driving a lamp 13 for displaying a gear position (for example, a shift-up instruction) is connected to the drive circuit 12. MPXIO is a switch that selectively relays and supplies any one of the output signals of the various sensors 2 to 5 and the switch 6 input via the level correction circuit 15 to the digital input module 9 in accordance with the command of the CPLJ 7. . Clock pulses are supplied to the CPU 7 from a clock generator 16 via a frequency divider 17.

Note that the CPU 7 has a built-in timer To, which has a down counter configuration that starts down counting when 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 5 and the switch 6 according to a program described later, and changes the gear of the manual transmission by lighting the lamp 13. This controls the driver to instruct the driver to shift up the position.

Next, the procedure of the shift instruction method according to the present invention executed by this control circuit 1 will be explained according to the operation flowcharts of FIGS. 2(A) to 2(C).

In FIG. 2(A), after initialization (step 20),
It is activated at a predetermined period (for example, every 2 Q m Sec) and first reads out the vehicle speed V stored in the RAM 12 (step 21), and then reads out the engine rotation speed Ne similarly stored in the RAM 12 (step 22). ). The vehicle speed V and engine speed NO are determined by RA as follows.
It is stored in M12. However, the pulse from Senna 2 is also input to the CPU 7 as an interrupt signal, and the CPU
7 measures the time between the current and previous pulses for each interrupt, calculates the average value of the measured times a predetermined number of times (for example, four times), and stores it in the RAM 12. The pulse from the Ne sensor 3 also serves as an interrupt signal for the CPU 7, and the average value of the rotation speed is stored in the RAM 12 in the same way as the V sensor 2. Next, the Pa sensor 4 and the Twt sensor 5 are activated every predetermined cycle M (for example, 400 m5ec) that is longer than the startup cycle.
Step 23) and gear position K (=Ne
/V) (step 24).

Next, in FIG. 2(B), the current gear position is determined depending on whether K is within a predetermined width (step 25).
~28), for each gear position, the determination reference vehicle speed o (vo1 ~
VO4) is set (Steps 29 to 32). Then, the cooling water fffiTw reaches a predetermined determination reference temperature Ta (
For example, it is determined whether the temperature is 75° C. or higher (step 33), and if T.N≧Ta, the so-called HOT mode is set, and if Tw<Ta, the so-called C0LD mode is set.

In the C0LD mode (Tw <Ta); in J3, it is determined whether the difference △V between the current value and the previous value of the vehicle speed V is greater than or equal to a predetermined value Va (for example, 0.5 m1le/h) ( Step 34), if ΔV≧Va, the vehicle is accelerating, and whether the TA switch 6 is ON or not, that is, whether the intake air temperature TA is below the predetermined discrimination reference intake air 4Tb (for example, 15°C) or not. This determination is made (step 35). If the TA switch 6 is ON, the data (direct VOII) is used as the discrimination reference vehicle speed OI to VO4 in 1st to 4th gears.

VO2+, VO31, and VO41 are set in sequence (step 36), and if the TA switch 6 is set to ○F, the data value VO12°022.V is set as the discrimination reference vehicle speed VOI to VO4.
O32 and VO42 are set in sequence (step 37).

Note that the data IflVon in step 36,
Vo 2+ , Vo 31 , Vo 4+ are the data values VO12, VO22, Vo
u.

It is set higher than VO42.

On the other hand, if it is determined in step 34 that △V<Va, it is then determined whether jΔv1≦Va (step 38), and if l△v1≦Va, it is cruise time, and the TA switch is 6 is ON or not (three steps). If the TA switch 6 is ON, data values VOI3, VO23, VO33, VO43 are used as discrimination reference vehicle speeds Vo+ to VO4 in 1st to 4th gears.
are set sequentially (step 40), and the TA switch 6 is set to ○.
If the vehicle speed is FF, data values VO14, VO24, VO34, and VO44 are sequentially set as determination reference vehicle speeds Vo+ to VO4 (step 41). Note that the data values VO13, VO231, VO33, and Vo5 in step 40 are the data values VOI4. VO24゜VO3
4. It is set higher than VO114.

In the HOT mode (Tw≧Ta>), similarly to the C○LD mode, it is determined whether ΔV is greater than or equal to the predetermined value Va (step 42), and if 8V≧va, the vehicle is accelerated. time, and the negative pressure P8 is a predetermined pressure Pa
(For example, -150no++Hg) or not is determined (step 43). If Pa>Pa, it is a sudden acceleration, and a timer TO of, for example, 2 seconds is set (step 44), and then the data value VOIS is set as the discrimination reference vehicle speed V01 to v04 in 1st to 4th gears.
, VO25°oz, and Vo45 are set <Step 4
5).

On the other hand, if P8≦Pa, it is a time of slow acceleration, and it is determined whether the count value of timer TO is equal to 0 (To = O), that is, the transition from sudden acceleration to slow acceleration occurs for 2 s.
It is determined whether or not more than ec has elapsed (step 46). If To≠◯, there is a possibility of sudden acceleration, so the process moves to step 45.

If To=O, then the discrimination reference vehicle speed Vo+-VO4 (!: tetator value Vows.

Vows, VO3B, and Vo46 are set in sequence (step 47). Hey, the data value Vo in step 45
ws, VO25, VO35, Vo45 are Stella 747
Data values VO16, Vox, Voz, VO40
is set higher than.

At step 42, if it is determined that ΔV is less than Va, then! It is determined whether ΔV1≦Va (step 48), and if lΔv1≦Va, it is the cruise time, and the negative pressure P8 is a predetermined pressure Pa (for example, −150 mn+f
-1g), it is determined whether the person is a person or not (step 49). If Pa>Pa, for example, a 2 sec timer To is set (step 50), and then data values VOI7°, VO27, VO37, and VO47 are sequentially set as the reference vehicle speeds Vo+ to Voa in 1st to 4th gears. 1lli constant sale (step 51). On the other hand, Ps
If ≦Pa, it is determined whether the count fa of the timer To is equal to O (To=◯) (step 52). If To f-0, the process moves to step 51, and if To=O, the data value Vows is set as the discrimination reference vehicle speed Vo+ to VO4 in 1st to 4th gears.

VO2B, VO3B, and VO48 are set in sequence (step 53). Note that the data value V in step 51
017, V O27, V o 37. Vo a
Get, data value VOI8. in step 53. V
O2B, VO3B.

Higher than Vos (set.

In the setting of the above-mentioned discrimination base t\medium vehicle speed o+~v04, in the case of C0LD mode (Tw<Ta), )IOT
The discrimination reference vehicle speeds Vo+ to VO4 are set to be higher than those in the mode (Tw≧Ta). In addition, by setting the discrimination reference vehicle speeds Vo+ to VO4 described above, GO
In the LD mode, when the TA switch 6 is ON, that is, when the intake air mTA is lower than the discrimination reference intake iTb, which is set lower than the discrimination reference temperature Ta, the discrimination reference vehicle speed Vo
+~Vo! will be set even higher.

In this way, when the discrimination reference vehicle speeds Vo+ to Vo4 at each gear position (1st to 4th gear) are set, FIG.
), it is determined whether the vehicle speed V at each gear position is greater than the determination reference vehicle speed Vo (Vo+ to VO4) (step 54), and if V>Vo, whether another upshift condition has been satisfied. It is determined whether or not (step 55)
If , is true, it is assumed that the engine is in an operating state in which an upshift is required, and it is determined whether a predetermined time tON has elapsed since the establishment of the shift-up (step 56). Then, when the predetermined time toN has elapsed, a lamp lighting command is issued to the drive circuit 14, and the shift-up lamp 13 is turned on (step 57).
), if the predetermined time tON has not elapsed, the lamp 13 is turned off by a lamp lighting stop command to the drive circuit 14 (step 58). Of course, if the shift-up condition is no longer satisfied before the predetermined time tON has elapsed since the shift-up condition was satisfied, the lamp 13 will not be lit.

On the other hand, in steps 25 to 28, the gear position is 1st to 4th.
If it is determined that the gear is not in gear, that is, if it is determined to be in neutral or fifth gear, the
If it is determined that ΔVl>Va, if V≦Vo is determined in step 54, that is, in the case of deceleration, or if it is determined in step 55 that other upshift conditions are not satisfied, step 59 , and a predetermined time tO starts from the time when this loop is entered in step 59.
It is determined whether the FF has elapsed. Predetermined time tOFF
has passed, the process moves to step 58 and the lamp 13 is turned off.
will stop lighting. If the predetermined time tOFF has not elapsed, the process moves to step 57 and the lighting state of the lamp 13 is continued.

Here, if the predetermined time tOFF is set shorter than the predetermined time tON, the chances of lighting the lamp 13 will be reduced.
By making the lamp 13 shorter, even if the driving range in which the lamp 13 is turned off is the driving range in which upshifting is required, it is not the optimal driving range. This has the effect of forcing drivers to drive within the range.

Although the present invention relates to changing the reference vehicle speed for determining low temperature ranges, changing the reference vehicle speed for determining high and medium temperature ranges has been proposed by the present applicant in Japanese Patent Application No. 134184/1984. . In this case, the engine temperature, such as the cooling water Tw, or the environmental temperature, such as the intake air temperature TA, is used as the determination temperature in this case. Further, in the above embodiment, the case where the gear position of the manual transmission is shifted up has been described, but the same setting can be made for the gear position on the downshift side.

As described in detail, according to the shift instruction method of the present invention, when the intake air temperature is lower than the discrimination reference intake air temperature that is set lower than the discrimination reference engine temperature, the shift instruction for the gear position of the manual transmission is determined. Since the standard shift-up point is shifted to the higher speed side, good drivability can be ensured even in low-temperature ranges, and warm-up characteristics are also improved, allowing for shorter warm-up times.

Furthermore, since the intake air temperature is a parameter that relatively accurately represents the atomization state, it is possible to ensure better drivability.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a system to which the shift instruction method according to the present invention is applied, and FIGS. 2(A) to (C) 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 rotation speed sensor 4... Negative pressure sensor 5... ...Cooling water wetness sensor 6...Intake temperature sensor

Claims (1)

[Claims] A shift instruction method for instructing a gear position shift of a manual transmission according to a driving state of a vehicle equipped with a manual transmission, the method comprising: detecting a vehicle speed and a temperature of an engine installed in the vehicle; When the engine temperature is lower than the discrimination reference engine temperature, the discrimination reference vehicle speed is set higher than when the engine temperature is higher than the discrimination reference engine temperature, the detected vehicle speed is compared with the discrimination reference vehicle speed, and a shift instruction is given based on the comparison result. , a manual transmission characterized in that the intake air temperature of the engine is detected, and when the detected intake air temperature is lower than the discrimination reference intake air temperature which is set lower than the discrimination reference engine temperature, the discrimination reference vehicle speed is further set higher. Shift instruction method.