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Method and device for determining a characteristic quantity for detecting the onboard supply system stability

A vehicle-mounted power grid and feature quantity technology, which is applied to determine the feature quantity used to identify the stability of the vehicle-mounted power grid. If the battery current exceeds the field in value, it can solve problems such as unsuitable vehicle-mounted power grid stability and achieve small hardware overhead. , Realize cost, improve the effect of accuracy

Active Publication Date: 2014-06-11
ROBERT BOSCH GMBH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] The method and the device are suitable for determining the crankability of a starter battery, but not for expressing an opinion on the expected stability of the vehicle electrical system (Aussagen)

Method used

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  • Method and device for determining a characteristic quantity for detecting the onboard supply system stability
  • Method and device for determining a characteristic quantity for detecting the onboard supply system stability
  • Method and device for determining a characteristic quantity for detecting the onboard supply system stability

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Embodiment Construction

[0021] Give the characteristic quantity U used to determine the stability of the on-board power grid min The device 10 delivers battery current I Batt , battery voltage U Batt and the temperature T that characterizes the battery temperature Batt . Furthermore, device 10 also includes a computing unit 11 and a battery model 12 . Which battery model 12 is used in the device 10 is immaterial to the invention. The battery model 12 is usually always to be used for the measured battery voltage U Batt To determine the corresponding battery current I Batt . exist figure 1 The battery model 12 shown in exemplarily relies on an equivalent circuit diagram of a battery during a discharge process at low frequencies, as described in DE 103 28 055 A1. The determination of the quantities Uc0 , Uk, Udp, Udn, Rk, Rdp, Rdn, Ri shown in the battery model 12 takes place, for example, by means of a state and parameter estimator as described in DE 103 28 055 A1. The device 10 is preferably ...

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Abstract

The invention relates to a device and to a method for determining a characteristic quantity (Umin) for detecting the onboard supply system stability, comprising the following steps: detecting when the engine starts, measuring the battery voltage (Umin) during the starting process of the engine, calculating a corresponding starting current (lmax) from the measured battery voltage (UminStart) using a battery model (12), determining at least one characteristic quantity (Umin) in the form of a prediction of an onboard supply system voltage to be expected using the battery model (12) and the calculated starting current (lmax).

Description

Background technique [0001] The invention is based on a method and a device for determining a characteristic variable for identifying the stability of a vehicle electrical system according to the preambles of the independent claims. A method and a device for determining the crankability of a starter battery of an internal combustion engine are already known from EP 1 207 297 A2. Do the following steps for this: [0002] - determination of the state of charge of the starter battery affecting the crankability, [0003] - determine the temperature that affects the starting ability, [0004] - calculate or determine the average voltage drop of the starter battery during the cranking phase, and [0005] - Estimation of the crankability of the starter battery by comparing the calculated or determined average voltage drop with a threshold value. [0006] The method and the device are suitable for determining the crankability of a starter battery, but are not suitable for expressi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/36B60R16/03
CPCG01R19/0084G01R31/40G01R31/007G01R31/36B60R16/03G01R31/3693G01R31/3647
Inventor J.莫茨
Owner ROBERT BOSCH GMBH
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