JPS608546A - Gear change time indicating device for car speed change gear - Google Patents

Abstract

PURPOSE:To improve the fuel cost at the time of high speed gear without impairing the acceleratingly driving performance at the time of low speed gear by directing the shift-up of a speed change gear when the load to an engine is within a certain range and either of the number of revolution of the engine or the car speed exceeded a preset value. CONSTITUTION:Frequency signals from a number of revolution sensor 2 are converted into voltage values through F-V convertors 5, 6 respectively and the outputs are compared with preset values in comparators 7, 8, respectively. When the inputted values get higher than the preset values, the comparators 7, 8 are turned on and these values are outputted to an AND circuit 10 through an OR circuit 9. On the other hand, the output from a load sensor 3 is compared through comparators 11, 12 and, when the output is above the preset low load in the comparator 11 and below the preset high load in the comparator 12, the output from an AND circuit 13 is inputted into the AND circuit 10. After that, when both the output from a gear position sensor 4 and the output from the AND circuit 10 are on, a shift-up directing device 15 is operated by means of an AND circuit 14.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an improvement in a device for instructing when to shift up a transmission in an automobile equipped with a manual transmission.

(Technical background) Engine fuel efficiency 41 varies greatly depending on operating conditions, and the best fuel efficiency range is when the engine load is relatively high. 9Y is preferable, but the range of use of automobile engines is very wide, and it is difficult to operate at the best fuel economy like this (J).

By the way, the engine rotation is transmitted to the middle wheels via the transmission, so by appropriately selecting the 7 gear positions, the engine rotation and load can be brought closer to a state with good fuel efficiency ( ) can be done.

However, in automobiles equipped with manual transmissions, the timing of shifting the transmission varies greatly depending on individual differences between drivers, and the shifts are not necessarily performed to achieve the best fuel efficiency.

Particularly in the acceleration driving range, engine speed 1~up is often not performed properly, and for example, if the engine speed is extended to the high engine speed range in a low gear, fuel efficiency will deteriorate accordingly.

Accordingly, a device for instructing one to another was proposed in Japanese Unexamined Patent Publication No. 55-31671.

According to this, the gear shift lug is instructed when the engine speed exceeds a set value when the engine load is within a predetermined range, making it possible to optimize gear changes.

However, such conventional devices only detect engine rotation and issue an instruction to shift up when a certain rotation is reached regardless of the gear A7 position. If you set the engine speed in the best upshift range, the set speed will be too high in the high gear positions after 3rd gear, and the engine speed will remain at 4 until the vehicle speed reaches a considerably high speed.
In some cases, this resulted in poor fuel efficiency and poor drivability, such as the inability to use higher gears.

(Object of the Invention) An object of the present invention is to provide a shift timing indicating device for an automobile transmission which indicates the optimum shift 1 to shift up timing based on the gear position and further improves fuel efficiency.

(Structure and operation of the invention) The present invention includes a means for detecting the engine rotation speed, a means for directly or indirectly detecting the vehicle speed, a means for detecting the engine load, and a predetermined engine load based on each of these detection results. and means for instructing the transmission to shift 1 when either the engine rotational speed or the vehicle speed exceeds a set value.

The vehicle speed when the engine rotation reaches the set value (J: varies depending on the gear position of the transmission, and the vehicle speed is higher in a high gear than in a low gear. Therefore, the shift 1 to up from a low gear is This is done based on the set rotation speed, but shifting I/up in a high gear is performed based on a set vehicle speed that is lower in rotation speed than this, so it does not impair acceleration driveability when in a low gear. This will improve fuel efficiency when in high gear.

(Example) FIG. 1 shows a first embodiment of the invention.

This embodiment is applied to a manual transmission with four forward gears, and in the figure, 1 is a rotational speed sensor as a means for detecting the engine rotational speed, 2 is a vehicle speed sensor as a means for detecting the vehicle speed, Reference numeral 3 indicates a load sensor for detecting the opening degree of the control lever of the fuel injection pump of the diesel engine in this embodiment as means for detecting the engine load.

Further, 4 is a gear V position sensor that is turned on when the transmission gear position is 1st, 2nd, or 3rd speed.

5.6 is F・■ which converts the frequency signals from the rotation speed sensor 1 and the vehicle speed sensor 2 into voltage values proportional to the frequency signals respectively.
In the converter, the outputs of these F-V converters 5, 6 are compared with set values Vn, Vs, respectively, in a comparator 7.8.

The rotation speed setting value vn is, for example, engine rotation speed 210 Or
pm, and the vehicle speed setting value VS is, for example, a voltage value corresponding to the vehicle speed when the engine speed reaches 1950rl)Ill in 3rd gear (7) which is lower than the above setting value. Set to .

Comparators 7 and 8 both turn ON (high level output) when the input value becomes larger than the set value, and output to the AND circuit 10 via the OR circuit 9. On the other hand, gear A7 is shifted up only within a predetermined load range. In other words, when the load is above that range, acceleration is emphasized, and when it is below that range, gear A7 is shifted up with emphasis on deceleration (engine braking). 83 Comparator 11
The output of the load sensor 3 is compared between and input this to the AND circuit 10.

Therefore, the AND circuit 10 is turned ON when the engine load is within a predetermined range and at the same time either the engine speed or the vehicle speed exceeds a set value, and determines that the shift amplifier should be performed.

The AND circuit 14 operates the shift-up instruction device 15 when the output of the gear A7 and the output of the AND circuit 10 are both ON.

The shift-up instruction device 15 lights up a light-emitting element or a lamp incorporated in, for example, an instrument panel in the driver's seat of the vehicle to prompt the driver to shift up. The gear position sensor 4 is provided because even if a decision is made to upshift while driving in 4th gear (top gear 7), it is impossible to change any further gears, so it is unnecessary in such cases. It has the function of preventing lamps etc. from lighting up.

Next, the effect will be explained.

As shown in FIG. 2, the lower the gear A7 of the transmission is, the lower the vehicle speed for the same rotational speed (the figure shows vehicle speeds in 1st, 2nd, and 3rd gears).

The OR circuit 9 outputs an instruction to shift up when either the engine speed or the vehicle speed becomes larger than the set value, but in the low gear position (1st or 2nd gear), the vehicle speed reaches the set value. Since the rotational speed exceeds the set value earlier than reaching the set value, when the engine rotational speed reaches 21001 pHl, the shift-up instruction device 15 is activated.

On the other hand, in the high gear A7 (3rd gear) position, the vehicle speed reaches the set value before the engine speed reaches the set value, so the shift 1-up instruction device 15 is activated at 210 Orpm or less.
is activated.

As a result, it is possible to automatically change the setting value (engine rotation speed) at the low gear to 7 position and the high gear A/position, and it is possible to lower the running rotation speed at the high gear position and improve fuel efficiency.

If vehicle speed switches that are turned on at a predetermined speed are provided for each of the four vehicle speed sensors 2, the outputs thereof can be input directly to the OR circuit 9, and the comparator 8 can be omitted.

Next, the embodiment shown in FIG. 3 will be explained.

In this embodiment, when the vehicle speed is above a predetermined speed, the output of the rotation speed sensor 1 is multiplied by a constant to make the input value of the comparator 7 appear larger, and the output of the vehicle speed sensor 2 is compared with the output of the vehicle speed sensor 2. -ru comparison 2! +8 setting value, for example, vehicle speed 50
What is the voltage equivalent to km/h, and how much is the vehicle speed?
When the stomach is empty, the multiplication circuit 16' outputs a signal that is multiplied by a constant.

When the constant signal is input to the multiplier circuit 16, the rotation speed sensor 1
The signal is multiplied by a constant (multiplying constant>1) and output to the comparator 7.

For example, in a low gear, the engine speed will reach the set value (210 rpm) before the vehicle speed reaches 50 km/h, so at that point the shift 1~up signal will be output to the AND circuit 10. , in high gear, the vehicle speed is 5 before the engine speed reaches 2100 rl) III. Q.
lv/l], and the rotation speed signal is multiplied by a constant by the multiplier circuit 16, so the actual rotation speed becomes 210 Orpm.
The set value of the comparator 7 is exceeded and a shift-up signal is output even if the shift-up signal is not changed.

J3, this multiplication constant is 2100... /1950=1.076 roar.

According to this Jz method, there is an advantage that the accuracy of the vehicle speed sensor 2 does not need to be so high and that it can also be used for a gear A7 of 4th speed or higher.

<Effects of the Invention> As described above, according to the present invention, it is possible to substantially shift the upshift instruction at the gear A7 position, which is higher than the low speed gear position, to a low rotation speed, and as a result, the low speed It is possible to improve fuel consumption in high-speed gear positions without sacrificing smooth acceleration in high-speed gear positions, and at the same time reduce the speed difference when changing gears at high speeds to reduce unnatural gear connections. This has the effect of preventing too much.

[Brief explanation of drawings]

FIG. 1 is a block circuit diagram of a first embodiment of the present invention, FIG. 2 is an operational characteristic diagram, and FIG. 3 is a block circuit diagram of main parts of the second embodiment. 1... Rotation speed sensor, 2... Vehicle speed sensor 4, 3...
Gear position sensor, 4... Gear position sensor, 5, 6...
・V converter, 7, 8, 11.12... comparator, 9
...OR circuit, 10.13...AND circuit, 15...
・Sif 1~Up instruction device. Patent applicant Nissan Motor Co., Ltd.

Claims (1)

[Claims] means for detecting engine speed; means for directly or indirectly detecting vehicle speed; and means for detecting engine load; 1. A gear shift timing instructing device for a 3I motor vehicle, characterized in that the device comprises means for instructing a shift up of a transmission when either one of the set values is exceeded.