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Diagnostic device

A diagnostic device and signal technology, which is applied to measuring devices, uses electric/magnetic devices to transmit sensing components, instruments, etc., can solve the problem of the motor not outputting torque and speed, and achieve the effect of accuracy and soundness

Active Publication Date: 2015-12-02
HITACHI ASTEMO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) The motor does not rotate in the opposite direction to the intended direction of rotation (ASIL-C or D)
[0004] (2) The motor does not output unwanted torque and speed (ASIL-C or D)

Method used

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Experimental program
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Effect test

no. 1 approach

[0031] Below, use Figure 1 to Figure 5 The configuration and operation of a diagnostic device 100A according to the first embodiment of the present invention will be described. Diagnosis device 100A is a device that detects an abnormality in a resolver circuit that calculates a rotation angle θ of a motor for a vehicle.

[0032] First, use figure 1 An overall configuration of a resolver system including the diagnostic device 100A according to the first embodiment of the present invention will be described. figure 1 It is a configuration diagram of a resolver system including the diagnostic device 100A according to the first embodiment of the present invention.

[0033] The resolver system includes a motor M, a resolver 10, a resolver circuit 20, and a diagnostic device 100A.

[0034] The motor M is an electric motor that drives the vehicle.

[0035] The resolver 10 is a general angle sensor that detects the rotation angle θ of the motor M. As shown in FIG. The resolver 1...

no. 2 approach

[0067] next, so Figure 6 ~ Figure 8 , the configuration and operation of the diagnostic device 100B according to the second embodiment of the present invention will be described.

[0068] First, use Figure 6 , the overall configuration of the resolver system including the diagnostic device 100B according to the second embodiment of the present invention will be described. Figure 6 It is a configuration diagram of a resolver system including a diagnostic device 100B according to the second embodiment of the present invention. In addition, in Figure 6 in, right with figure 1 The same parts are assigned the same reference numerals.

[0069] exist Figure 6 in, with figure 1 In comparison, the output signals SIN+ and SIN− of the secondary coil 12 of the resolver 10 and the output signals COS+ and COS− of the secondary coil 13 of the resolver 10 are input to the diagnostic device 100B differently. In addition, it is also different in that an AB pulse (encoder pulse) corr...

no. 3 approach

[0091] Next, use Figure 9 ~ Figure 11 , the configuration and operation of the diagnostic device 100C according to the third embodiment of the present invention will be described.

[0092] First, use Figure 9 , the overall configuration of the resolver system including the diagnostic device 100C according to the third embodiment of the present invention will be described. Figure 9 It is a configuration diagram of a resolver system including a diagnostic device 100C according to a third embodiment of the present invention. In addition, in Figure 9 , right with Figure 6 The same parts are assigned the same reference numerals.

[0093] exist Figure 9 in, with Figure 6 In contrast, the RDC 21 is different in that an error signal Err is input to the diagnosis device 100C as a result of self-diagnosis.

[0094] Next, use Figure 10 , the configuration of a diagnostic device 100C according to a third embodiment of the present invention will be described. Figure 10 It...

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Abstract

A diagnostic device capable of accurately diagnosing the soundness of a resolver circuit is provided. A shifter (101) receives excitation signal (EXC+) and excitation signal (EXC-); shifts the level of excitation signal (EXC+), excitation signal (EXC-), or both; and performs level shifting such that a period of time (∆T) that starts with one of two times in which, in the vicinity of the peak value of excitation signal (EXC+), excitation signal (EXC+) and excitation signal (EXC-) are at the same value and ends with the other of the two times is less than a prescribed threshold. A trigger generation circuit (102) generates a trigger (Trg) during said period of time (∆T). A control unit (103) determines whether there is an abnormality in the resolver circuit on the basis of the trigger (Trg).

Description

technical field [0001] The present invention relates to a diagnostic device that detects abnormality in a resolver circuit that calculates a rotation angle of a motor for a vehicle. Background technique [0002] In the case of controlling a motor for a vehicle mounted on a vehicle such as a PHEV (Plug-inHybridElectricVehicle: plug-in hybrid electric vehicle) or an EV (ElectricVehicle: electric vehicle), it is necessary to satisfy the functional safety standard of ISO26262. Therefore, it is generally required to achieve the following security goals. [0003] (1) The motor does not rotate in the opposite direction to the intended direction of rotation (ASIL-C or D). [0004] (2) The motor does not output unwanted torque and speed (ASIL-C or D). [0005] In order to achieve such a safety goal, it is necessary to provide a safety mechanism that stops the driving of the motor when abnormal rotation of the vehicle motor is detected. [0006] Therefore, in the conventional resol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/20G01D5/244
CPCG01D5/2073G01D5/24466G01D5/204
Inventor 后藤广生重田哲冈部敦明圆恒平高宗裕一郎
Owner HITACHI ASTEMO LTD
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