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Method of using flow demand to adjust hydraulic pressure to recharge accumulator

A technology of hydraulic pressure and adjustment method, which is applied in the direction of accumulator device, fluid pressure actuation device, fluid pressure actuation system test, etc. It can solve the problems of hydraulic loss error, depending on actual pressure, etc., and avoid large changes Effect

Inactive Publication Date: 2017-04-12
PEZHO SITROEN AUTOMOBILS SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, the problem raised is that, depending on different parameters such as the viscosity of the oil, the temperature of the mechanism or the wear, large errors may arise in the estimation of the hydraulic losses, which largely depend on the actual pressure in the circuit

Method used

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  • Method of using flow demand to adjust hydraulic pressure to recharge accumulator
  • Method of using flow demand to adjust hydraulic pressure to recharge accumulator
  • Method of using flow demand to adjust hydraulic pressure to recharge accumulator

Examples

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Embodiment Construction

[0040] figure 1 A power train is shown comprising a heat engine 2 directly driving a variable displacement pump 4 .

[0041] The variable displacement pump draws fluid in the low pressure circuit BP to supply the high pressure circuit HP including the pressure accumulator 6 . The pressure accumulator 6 can be composed of a number of components, arranged in parallel or in series, according to all known methods for accumulating hydraulic pressure.

[0042] The pressure circuit HP is also linked to the input of a variable displacement hydraulic motor 8 that can operate on an engine or a pump, driven by a differential 10 of two drive wheels 12 of the same axle of the vehicle. drive. The output of the hydraulic motor 8 is linked to a low pressure circuit BP containing a low pressure container 14 for fluid.

[0043] The control calculator of the power train receives the following information to adjust the different parameters including, inter alia, the rotational speed of the hea...

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Abstract

Method for regulating hydraulic pressure using a flow demand from a pump (4), so as to recharge a pressure accumulator (6), this method using a measurement of the actual pressure in the circuit and a model estimating hydraulic leaks, calculates the derivative with respect to a variable time parameter of the discrepancy between the datum pressure and the measured pressure then uses an inverse accumulator model to obtain a flow prepositioning value that it adds to an estimate of the leaks, then calculates the discrepancy between this result and the leak rate estimate in order to input it to the accumulator model with the measured pressure in order to obtain a pressure derivative datum, then calculates the discrepancy between this datum and the measured pressure derivative in order, in a proportional-integral type regulator, to process it and then finally adds the corrected flow rate value obtained to the flow rate prepositioning value in order to obtain the flow regulation demand.

Description

[0001] priority statement [0002] This application claims priority from French application 1256342 filed on July 3, 2012, the content of which (text, drawings and claims) is incorporated herein by reference. technical field [0003] The present invention relates to a hydraulic pressure regulation method especially suitable for a hybrid vehicle, and a control calculator and a hybrid vehicle implementing the method. Background technique [0004] Some hybrid vehicles include a heat engine that drives a variable displacement hydraulic pump that charges a pressure accumulator with high pressure to supply a variable displacement hydraulic unit that can operate on the engine or a pump to Drive the drive wheels of the vehicle. The output of the hydraulic unit is linked to a low pressure which returns to the input of the pump. [0005] There is also a reversible hydraulic mechanism by which it is possible to act on the engine to propel the vehicle and partially recover its kinetic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H61/4069B60W20/00B60K6/12
CPCB60K6/12B60W20/10F15B1/033F15B19/007F16H61/00F16H61/12F16H61/4035F16H61/4096F16H61/4148F16H61/431F16H61/472F16H2059/6846F16H2059/6861F16H2061/0093B60W20/11Y02T10/62
Inventor F·古尔夫
Owner PEZHO SITROEN AUTOMOBILS SA
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