Boots – shoes – and leggings
Patent
1984-08-02
1987-10-20
Gruber, Felix D.
Boots, shoes, and leggings
340 52F, B60K 2008, B60K 4106, G06F 1520
Patent
active
047018526
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method of arranging signaling to a vehicle driver that an upward gear change is required. The engine speed is measured and compared to a comparative value, and if one value exceeds the other, a signal is sent to the driver.
The invention also relates to a device for signaling to a vehicle driver in a motor vehicle which has an engine and a transmission comprising a manual gear box with a plurality of shift positions and which includes a tachometer and computing means for signaling excessive engine speed.
A method and a device of this type are known by German Offlenlegungsschrift No. 29 26 070 and have come into use in certain Volkswagen Passat models for example. This known device works as follows: a lamp (LED) is lit as soon as the engine speed exceeds a certain value, circa 2000 rpm. The signal means that the driver should shift up to obtain better fuel economy. If the highest gear is already engaged, there will be no signal.
The known equipment is intended to solve the problem of preventing the engine from running at unnecessarily high speed with a view both to the life of the engine and obtaining good fuel economy. A few experienced drivers find no difficulty, due to much practice, in always driving with the highest possible gear engaged for each occasion, but most other drivers find this to be considerably difficult. It is true that many cars are equipped with tachometers, but it is in practice of limited use to many drivers.
A disadvantage of the known solution is that the increments in the gear box between the different gear speed is not uniform but decreases in the higher gears. If one changes gears at a constant rpm in each gear position, the engine speed after the gear change, which is the relevant rpm in this context, will be different depending on which gear is selected.
Example: VW Passat
A shifting principle according to which gears are changed when an engine speed of 2000 rpm is reached gives the following result:
______________________________________ 15 km/h 1st 2000 rpm 2nd 1118 rpm
27 km/h 2nd 2000 rpm 3rd 1333 rpm
41 km/h 3rd 2000 rpm 4th 1407 rpm
______________________________________
An engine speed which is too low will make the vehicle sluggish, and it is unadvisable to drive at low rpm, especially if the load is high, since it may even result in damage to the engine in certain cases. The known solution therefore necessitates making a compromise between the goal of providing an early indication of excessively high engine speed and the risk of obtaining too low an engine speed when shifting up between certain gears.
SUMMARY OF THE INVENTION
One purpose of the present invention is to eliminate this disadvantage and have the indication take primarily into account the engine speed which will be obtained if a higher gear is selected rather than the present engine speed.
These and other purposes are achieved according to the method and device having the characteristics of the invention.
In accordance with a preferred aspect of the invention, the combination is also used for measuring both the engine speed and the vehicle speed and comparing the ratio between them with a predicted value for the respective gear position. Theoretically, this ratio should be constant for each gear position. If the engine speed is measured via the generator, however, the actual engine speed will not be measured if the belt between the generator and the engine is slipping. Therefore the ratio between engine speed and vehicle speed, measured in this manner, will differ from that dictated by the gear ratio. It is good to be aware of such a discrepancy, as it makes it possible to detect a malfunction at an early stage. The malfunction can also be in the clutch, and an indication of this discrepancy is thus an early sign that the vehicle should be serviced.
According to a particular aspect of the invention, it is possible to make the device according to the invention self-teaching. This means that the device, in a special operation without the aid of the operat
REFERENCES:
patent: 4294341 (1981-10-01), Swart
patent: 4320381 (1982-03-01), Olivier
patent: 4439833 (1984-03-01), Yamaguchi et al.
patent: 4564906 (1986-01-01), Stephan et al.
AB Volvo
Gruber Felix D.
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