US 10,495,660 B2Granted

Rotational speed display device

AssigneeNissan Motor Co., Ltd.

InventorYoshinori Yamamoto

Life of this patent

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Abstract

An actual slip amount (S) of a torque converter is calculated by subtracting an actual input shaft rotational speed (Nr) of an automatic transmission from an engine rotational speed (Ne), which is the rotational speed of a crankshaft. Then, an engine rotational speed for display (Nd) is calculated by adding a slip amount adjusted for display (Sp), which is obtained by applying a predetermined correction process to the actual slip amount (S) to the actual input shaft rotational speed (Nr). The above described correction process may be a first-order-lag filter processing, for example. Thus, even when the actual slip amount (S) temporarily increases or decreases, a temporary increase or decrease in the engine rotational speed for display (Nd) may be suppressed. In other words, fluctuation or variation in the engine rotational speed for display (Nd) is suppressed. Further, Further, it is possible to provide the driver with a visually excellent direct-feeling display of engine speed Nd without impairing the drivability.

Claims4

Dependent claims

An engine rotational speed display device mounted on a vehicle in which a driving force of an internal combustion engine is transmitted to a driving wheel via a torque converter and an automatic transmission, the engine rotational speed display device comprising:

a display unit;
and
a processor coupled to a non-transitory memory and configured to read instructions from the non-transitory memory to cause the engine rotational speed display device to perform operations comprising:
calculating a display engine rotational speed for display on the display unit by adding a display slip amount to an actual input shaft rotational speed of the automatic transmission;
calculating the display slip amount by applying a predetermined correction process to an actual slip amount in the torque converter so as to be less than the actual slip amount, wherein the actual slip amount fluctuates in accordance with an operating state;
applying the correction process such that fluctuations in the display slip amount will be less than fluctuations in the actual slip amount;
and
displaying the display engine rotational speed on the display unit.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/747,454Filed 16 Sep 2015
Published: US 2018/0217177 A12 Aug 2018
Granted: 3 Dec 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification16 codes

G01P 3/465
By measuring amplitude of generated current or voltage: by using dynamo-electro tachometers or electric generator
B60K 35/214
Using visual output, e.g. blinking lights or matrix displays: variable gauge scales, e.g. scale enlargement to adapt to maximum driving speed
B60K 35/28
Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor: characterised by the type of the…
B60K 35/81
Arrangements for controlling instruments: for controlling displays