SEMICONDUCTOR DEVICE, BATTERY STATE MONITORING MODULE, AND VEHICLE SYSTEM

• US 20170045586A1
• Filed: 10/28/2016
• Published: 02/16/2017
• Est. Priority Date: 05/31/2012
• Status: Active Grant

• Current Assignee: Renesas Electronics Corporation
• Original Assignee: Renesas Electronics Corporation
• Inventors: KIUCHI, Hideki
• Granted Patent: US 9,933,490 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F02N 11/0825 related to prevention of engine restart failure, e.g. disabling automatic stop at low battery state
• CPC Class Codes: G01R 31/3647 for determining the ability of a battery to perform a critical function, e.g. cranking
• CPC Class Codes: G01R 31/3648 comprising digital calculation means, e.g. for performing an algorithm
• CPC Class Codes: G01R 31/382 Arrangements for monitoring battery or accumulator variables, e.g. SoC
• CPC Class Codes: G01R 31/3842 combining voltage and current measurements
• CPC Class Codes: G01R 31/386 using test-loads
• CPC Class Codes: G01R 31/388 involving voltage measurements
• CPC Class Codes: G01R 31/396 Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
• CPC Class Codes: G01R 31/52 Testing for short-circuits, leakage current or ground faults

Abstract

A vehicle system, includes a battery state monitoring module including a battery state monitoring device for measuring a current monitor voltage value that varies according to a current value flowing through a current detecting resistance coupled to power supply terminals of a battery, and an arithmetic circuit that determines a state of the battery based on the current monitor voltage value measured by the battery state monitoring device and transmits the determination result at a request from a high-order system, and a central control unit for outputting an internal ignition signal that directs start and stop of a engine to an electronic load circuit for controlling the engine and a starter, the battery state monitoring device carries out a short-circuit test operation for testing a short circuit state between two external terminals coupled to two ends of the current detecting resistance, and a current monitoring operation of measuring.

Claims

1. A vehicle system, comprising:

a battery state monitoring module including a battery state monitoring device for measuring a current monitor voltage value that varies according to a current value flowing through a current detecting resistance coupled to power supply terminals of a battery, and an arithmetic circuit that determines a state of the battery based on the current monitor voltage value measured by the battery state monitoring device and transmits the determination result at a request from a high-order system; and

a central control unit for outputting an internal ignition signal that directs start and stop of a engine to an electronic load circuit for controlling the engine and a starter,

wherein the battery state monitoring device carries out a short-circuit test operation for testing a short circuit state between two external terminals coupled to two ends of the current detecting resistance, and a current monitoring operation of measuring a current monitor voltage value that occurs between the two ends of the current detecting resistance, and

wherein the central processing unit makes the engine move to a stop state by the internal ignition signal in response to a vehicle becoming in a stop state,

also directs a diagnosis processing of the battery including the short-circuit test operation and the current monitoring operation to the battery state monitoring device, and

when making the vehicle move from the stop state to a run state, makes the starter and the engine start by the internal ignition signal and also receives a result of the diagnosis processing of the battery.

2. The vehicle system according to claim 1,

wherein the battery state monitoring device includes:

a first and a second external terminals coupled to power supply wiring that couples one end of the current detecting resistance and the power supply terminal of the battery;

a third external terminal coupled to an other end of the current detecting resistance;

a measurement part for measuring a voltage difference between the first external terminal and the second external terminal;

a first current source for outputting a first measurement current to the second external terminal;

a second current source for outputting a second measurement current to the third external terminal; and

a control circuit for controlling an output of the second measurement current destined to the third external terminal.

3. The vehicle system according to claim 1,

wherein the battery state monitoring device further includes a monitor circuit for outputting at least a battery voltage value that varies according to the voltage of the battery and a battery environmental temperature value corresponding to a temperature of the battery, and

wherein the arithmetic circuit determines the state of the battery based on the current monitor voltage value, the battery voltage value, and the battery environmental temperature value.

4. The vehicle system according to claim 1,

wherein when the result of the diagnosis processing indicates that an ability of the battery is insufficient for engine restart, the central control unit maintains the engine in an operating state regardless of a state of the vehicle during a period until an external ignition signal inputted from the outside indicates that the vehicle moves to the stop state.