Diagnostic equipment

Abstract

The present invention provides a diagnostic device that can diagnose relay sticking without completely interrupting the power supply path to the loads. [Solution] A diagnostic device for relays mounted on a vehicle, comprising: a first processing unit that controls the on and off states of a high-voltage battery relay provided in a path for supplying power from a high-voltage battery to loads, and an auxiliary battery relay provided in a path for supplying power from an auxiliary battery to loads; and a second processing unit that performs a seizure diagnosis of the high-voltage battery relay and the auxiliary battery relay according to the control of the first processing unit, wherein the first processing unit controls the timing of the seizure diagnosis of the high-voltage battery relay and the seizure diagnosis of the auxiliary battery relay so as not to overlap.

Description

【Technical Field】 【0001】 The present disclosure relates to a relay diagnostic device mounted on a vehicle. 【Background Art】 【0002】 Patent Document 1 discloses a power supply system capable of diagnosing a failure of a relay inserted between a battery for power supply and loads mounted on a vehicle. 【Prior Art Documents】 【Patent Documents】 【0003】 [[ID=二十一]] 【Patent Document 1】 International Publication No. 2016 / 103721 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 For loads that always require power supply, there is a power supply system that supplies power from a plurality of batteries via different paths respectively. In such a power supply system, from the perspective of safety such as cutting off the power supply path when a battery is abnormal, relays may be provided in each of the plurality of power supply paths. 【0005】 Regarding the relays provided in each power supply path, it is desirable to periodically perform a sticking diagnosis. However, in the sticking diagnosis of a relay, since it is necessary to temporarily open the relay to cut off the power supply path, if the timings of cutting off the plurality of power supply paths all overlap, power cannot be supplied to the loads that require power supply (power loss), and thus there remains a problem. 【0006】 The present disclosure has been made in view of the above problems, and an object thereof is to provide a diagnostic device capable of performing a sticking diagnosis of a relay without cutting off all the paths for supplying power to the loads. 【Means for Solving the Problems】 【0007】 To solve the above problems, one aspect of the disclosed technology is a diagnostic device for relays mounted on a vehicle, comprising: a first processing unit that controls the on and off states of a high-voltage battery relay provided in a path for supplying power from a high-voltage battery to loads, and an auxiliary battery relay provided in a path for supplying power from an auxiliary battery to loads; and a second processing unit that performs a seizure diagnosis of the high-voltage battery relay and the auxiliary battery relay according to the control of the first processing unit, wherein the first processing unit controls the timing of the seizure diagnosis of the high-voltage battery relay and the seizure diagnosis of the auxiliary battery relay so as not to overlap. [Effects of the Invention] 【0008】 According to the diagnostic device described above, the timing of the sticking diagnosis of the high-voltage battery relay and the auxiliary battery relay is staggered, so that the relay sticking diagnosis can be performed while either the power supply path from the high-voltage battery to the loads or the power supply path from the auxiliary battery to the loads is conductive. [Brief explanation of the drawing] 【0009】 [Figure 1] Schematic diagram of a power supply system including a diagnostic device according to one embodiment of the present disclosure. [Figure 2] Flowchart of the processing flow for fault diagnosis control of the auxiliary battery relay performed by the diagnostic device. [Figure 3] An example of on / off switching of the auxiliary battery relay in relay sticking diagnostic control shown in Figure 2. [Modes for carrying out the invention] 【0010】 The diagnostic device disclosed herein, in a power supply system where multiple relays (system main relays) are provided in the power supply path to loads requiring power supply, avoids the simultaneous interruption of multiple power supply paths by not performing relay sticking diagnosis simultaneously. The timing and prerequisites for relay sticking diagnosis are coordinated via communication. The embodiments of this disclosure will be described in detail below with reference to the drawings. 【0011】 <Embodiment> [composition] Figure 1 is a schematic diagram illustrating a power supply system 100 including a diagnostic device 170 according to one embodiment of the present disclosure. The power supply system 100 illustrated in Figure 1 comprises a high-voltage battery 110, a DC-DC converter 120, a high-voltage battery SMR 130, an auxiliary battery 140, a first auxiliary battery SMR 151, a second auxiliary battery SMR 152, a test load 160, and a diagnostic device 170. 【0012】 The power supply system 100 illustrated in Figure 1 is installed in vehicles such as hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and battery electric vehicles (BEVs). 【0013】 The high-voltage battery 110 is a rechargeable secondary battery. This high-voltage battery 110 can supply the power it stores to the loads 180 via the DC-DC converter 120 and the high-voltage battery SMR 130. 【0014】 The DC-DC converter 120 is installed between the high-voltage battery 110 and the high-voltage battery SMR 130 and is a power converter that converts the voltage of the high-voltage battery 110, which is input to the loads 180, into the voltage required by the loads 180, and outputs it to the high-voltage battery SMR 130. 【0015】 The high-voltage battery SMR130 is installed in the path for supplying power from the high-voltage battery 110 to the loads 180, and is a relay (system main relay (SMR)) that switches the connection state between the high-voltage battery 110 and the loads 180 between an electrically conductive ON state and an electrically disconnected OFF state. A semiconductor relay or a mechanical relay can be used for this high-voltage battery SMR130. 【0016】 The auxiliary battery 140 is a rechargeable secondary battery. This auxiliary battery 140 is typically composed of a lithium-ion battery (auxiliary LiB). The auxiliary battery 140 can supply the power it stores to the loads 180 via the first auxiliary battery SMR151 and the second auxiliary battery SMR152. 【0017】 The first auxiliary battery SMR151 and the second auxiliary battery SMR152 are relays (system main relays (SMRs)) installed in the path for supplying power from the auxiliary battery 140 to the loads 180, and are used to switch the connection state between the auxiliary battery 140 and the loads 180 between an electrically conductive ON state and an electrically disconnected OFF state. The first auxiliary battery SMR151 and the second auxiliary battery SMR152 are connected in series, and a test load 160 for generating a test potential during relay sticking diagnosis is connected between the connection point and the ground (GND) potential. Semiconductor relays or mechanical relays are used for the first auxiliary battery SMR151 and the second auxiliary battery SMR152. 【0018】 The diagnostic device 170 is a device for performing relay sticking diagnosis on the high-voltage battery SMR 130, the first auxiliary battery SMR 151, and the second auxiliary battery SMR 152. When performing the relay sticking diagnosis, this diagnostic device 170 instructs ON / OFF to the high-voltage battery SMR 130, the first auxiliary battery SMR 151, and the second auxiliary battery SMR 152, and controls the connection state (conductivity / interruption). The instruction and control of the connection state to each relay by this diagnostic device 170 are performed by communication via an in-vehicle network such as CAN, for example. 【0019】 This diagnostic device 170 includes a high-voltage battery SMR processing unit 171 and an auxiliary battery SMR processing unit 172. 【0020】 The high-voltage battery SMR processing unit 171 is configured to handle the high-voltage battery 110 and other processes. This high-voltage battery SMR processing unit 171 can acquire the power supply state (on / off) of the vehicle. Further, the high-voltage battery SMR processing unit 171 can instruct and control the connection state of the high-voltage battery SMR 130, and can further determine whether the high-voltage battery SMR 130 can be held in the on (conductive) state. In addition, the high-voltage battery SMR processing unit 171 can perform relay sticking diagnosis on the high-voltage battery SMR 130. Further, the high-voltage battery SMR processing unit 171 can request the auxiliary battery SMR processing unit 172 to perform relay sticking diagnosis on the first auxiliary battery SMR 151 and the second auxiliary battery SMR 152. 【0021】 The auxiliary battery SMR processing unit 172 is a configuration for handling the processing of the auxiliary battery 140. This auxiliary battery SMR processing unit 172 can respectively instruct and control the connection states of the first auxiliary battery SMR 151 and the second auxiliary battery SMR 152. Further, the auxiliary battery SMR processing unit 172 can perform relay sticking diagnosis on the first auxiliary battery SMR 151 and the second auxiliary battery SMR 152. Also, the auxiliary battery SMR processing unit 172 can notify the high-voltage battery SMR processing unit 171 that the relay sticking diagnosis of the first auxiliary battery SMR 151 and the second auxiliary battery SMR 152 has ended. 【0022】 Note that part or all of the above-described diagnostic device 170 can typically be configured by an electronic control unit (ECU: Electronic Control Unit) including a processor such as a microcomputer, a memory, and an input / output interface. By the processor reading and executing the program stored in the memory, part or all of the functions performed by the above-described high-voltage battery SMR processing unit 171 and the auxiliary battery SMR processing unit 172 can be realized. 【0023】 The loads 180 are configured to include one or more loads that consume electric power by driving, such as electronic devices and actuators mounted on the vehicle. These loads 180 operate with the electric power supplied from the high-voltage battery 110 via the DCDC converter 120 and the high-voltage battery SMR 130, or the electric power supplied from the auxiliary battery 140 via the first auxiliary battery SMR 151 and the second auxiliary battery SMR 152. 【0024】 [Control] Next, the control performed by the diagnostic device 170 according to this embodiment will be described with further reference to Figures 2 and 3. Figure 2 is a flowchart illustrating the processing procedure for the lock-up diagnostic control of the auxiliary battery relays (first auxiliary battery SMR151 and second auxiliary battery SMR152) performed by each component of the diagnostic device 170. The relay lock-up diagnostic control illustrated in Figure 2 is started, for example, when an input for turning off the vehicle's power is detected. 【0025】 (Step S201) The high-voltage battery SMR processing unit 171 determines whether or not the high-voltage battery SMR 130 can be kept in the ON state. This determination is made to confirm whether or not it is possible to perform a diagnosis of sticking of the auxiliary battery relay. If it is determined that it is possible to keep the high-voltage battery SMR 130 in the ON state (step S201, yes), the process proceeds to step S202. 【0026】 If it is determined that it is impossible to keep the high-voltage battery SMR130 in the ON state (step S201, No), the relay sticking diagnostic control may be terminated instead of waiting for it to become possible to keep it in the ON state. 【0027】 (Step S202) The high-voltage battery SMR processing unit 171 holds the high-voltage battery SMR 130 in an electrically conductive ON state. Once the high-voltage battery SMR 130 is held in the ON state, the process proceeds to step S203. 【0028】 (Step S203) The high-voltage battery SMR processing unit 171 requests the auxiliary battery SMR processing unit 172 to perform a relay sticking diagnosis for the auxiliary battery relays, the first auxiliary battery SMR151 and the second auxiliary battery SMR152. This request is made by communication from the high-voltage battery SMR processing unit 171 to the auxiliary battery SMR processing unit 172. Once the request to perform a relay sticking diagnosis for the first auxiliary battery SMR151 and the second auxiliary battery SMR152 is received, the process proceeds to step S204. 【0029】 (Step S204) The auxiliary battery SMR processing unit 172 determines whether or not a request for relay sticking diagnosis of the first auxiliary battery SMR151 and the second auxiliary battery SMR152 has been received from the high-voltage battery SMR processing unit 171. If a request for relay sticking diagnosis of the first auxiliary battery SMR151 and the second auxiliary battery SMR152 has been received (step S204, yes), the process proceeds to step S205. 【0030】 (Step S205) The auxiliary battery SMR processing unit 172 initiates relay sticking diagnosis of the first auxiliary battery SMR151 and the second auxiliary battery SMR152 in response to a request from the high-voltage battery SMR processing unit 171. Once the relay sticking diagnosis of the first auxiliary battery SMR151 and the second auxiliary battery SMR152 is initiated, the process proceeds to step S206. 【0031】 (Step S206) The auxiliary battery SMR processing unit 172 performs a sticking diagnosis for each relay by instructing (operating) the first auxiliary battery SMR151 and the second auxiliary battery SMR152 to turn on / off, respectively, and determining whether there is any mismatch in the detected test potential levels. More specifically, the auxiliary battery SMR processing unit 172 performs the on / off instruction for the first auxiliary battery SMR151 and the second auxiliary battery SMR152 at the timings shown in Figure 3, thereby performing a sticking diagnosis for the first auxiliary battery SMR151 and the second auxiliary battery SMR152, respectively. 【0032】 In Figure 3, the auxiliary battery SMR processing unit 172 appropriately switches the ON / OFF state of the first auxiliary battery SMR151 (hereinafter referred to as "SMR1") while the second auxiliary battery SMR152 (hereinafter referred to as "SMR2") is in the OFF state, and performs ON-fixed and OFF-fixed diagnostics for SMR1. In addition, the auxiliary battery SMR processing unit 172 appropriately switches the ON / OFF state of SMR2 ​​while SMR1 is in the OFF state, and performs ON-fixed and OFF-fixed diagnostics for SMR2. Specifically, the following judgments are made. 【0033】 If the auxiliary battery SMR processing unit 172 instructs SMR2:OFF and SMR1:ON, the test potential will be high if SMR1 is functioning correctly. However, if the test potential is lower than the threshold, it indicates a mismatch, and it can be determined that SMR1 is stuck in the OFF position (SMR1 OFF fixation diagnosis). 【0034】 Furthermore, if the auxiliary battery SMR processing unit 172 instructs SMR1:OFF and SMR2:OFF, the test potential will be low if both SMR1 and SMR2 ​​are functioning normally. However, if the test potential is higher than the threshold, it indicates a mismatch, and it can be determined that one or both of SMR1 and SMR2 ​​are stuck in the ON position. It is possible to determine which SMR is stuck in the ON position by comparing the test potential with a threshold (which can be switched by control) based on the voltage of the high-voltage battery 110 and the auxiliary battery 140 (identification of the voltage source) (diagnosis of ON sticking of SMR1 and SMR2). 【0035】 Furthermore, if the auxiliary battery SMR processing unit 172 instructs SMR1:OFF and SMR2:ON, the test potential will be high if SMR2 ​​is functioning correctly. However, if the test potential is lower than the threshold, it indicates a mismatch, and it can be determined that SMR2 ​​is stuck in the OFF position (SMR2 OFF fixation diagnosis). 【0036】 Once a relay sticking diagnosis is performed for each of the auxiliary battery relays, the first auxiliary battery SMR151 and the second auxiliary battery SMR152, the process proceeds to step S207. 【0037】 (Step S207) The auxiliary battery SMR processing unit 172 completes the relay sticking diagnosis of the auxiliary battery relays (first auxiliary battery SMR151 and second auxiliary battery SMR152). This diagnosis completion information is communicated from the auxiliary battery SMR processing unit 172 to the high-voltage battery SMR processing unit 171. Once the relay sticking diagnosis of the auxiliary battery relays is complete, the process proceeds to step S208. 【0038】 (Step S208) The high-voltage battery SMR processing unit 171 determines whether the relay sticking diagnosis of the auxiliary battery relays (first auxiliary battery SMR151 and second auxiliary battery SMR152) has been completed. This determination is made when the auxiliary battery SMR processing unit 172 notifies it that the relay sticking diagnosis has been completed. If it is determined that the relay sticking diagnosis of the auxiliary battery relays has been completed (step S208, yes), the process proceeds to step S209. 【0039】 (Step S209) The high-voltage battery SMR processing unit 171 terminates the ON state of the high-voltage battery SMR 130 and controls it to the OFF state, electrically disconnecting it. Once the high-voltage battery SMR 130 is controlled to the OFF state, the process proceeds to step S210. 【0040】 (Step S210) The diagnostic device 170 (high-voltage battery SMR processing unit 171 and auxiliary battery SMR processing unit 172) controls the vehicle's power to be turned off in response to an input operation to turn off the vehicle's power. When the vehicle's power is controlled to be turned off, this relay sticking diagnostic control ends. 【0041】 When performing a relay sticking diagnosis on the high-voltage battery SMR130, the first auxiliary battery SMR151 and the second auxiliary battery SMR152 should be kept in the ON state (electrically connected), and then the ON / OFF state (ON / OFF) of the high-voltage battery SMR130 should be switched as appropriate to perform the ON sticking diagnosis and OFF sticking diagnosis described in step S206 above. 【0042】 <Effects and Actions> As described above, according to the diagnostic device 170 of one embodiment of the present disclosure, the ON / OFF of the high-voltage battery SMR130 provided in the power supply path from the high-voltage battery 110 to the loads 180, and the ON / OFF of the auxiliary battery relays (first auxiliary battery SMR151 and second auxiliary battery SMR152) provided in the power supply path from the auxiliary battery 140 to the loads 180 are appropriately instructed, and when performing relay sticking diagnosis of the high-voltage battery SMR130 and the auxiliary battery relays, the timing of the relay sticking diagnosis of the high-voltage battery SMR130 and the relay sticking diagnosis of the auxiliary battery relays are controlled so that they do not overlap. 【0043】 This relay ON / OFF control allows for relay sticking diagnosis of the high-voltage battery SMR130, the first auxiliary battery SMR151, and the second auxiliary battery SMR152 without completely interrupting the power supply path to the loads 180. 【0044】 Although one embodiment of the present disclosure has been described above, the present disclosure can be interpreted not only as the diagnostic device described above, but also as a method executed by a diagnostic device equipped with a processor and memory, a program for that method, a computer-readable non-temporary recording medium storing that program, or a vehicle equipped with the diagnostic device. [Industrial applicability] 【0045】 The diagnostic device of this disclosure can be used in vehicles equipped with a high-voltage battery and an auxiliary battery, etc. [Explanation of symbols] 【0046】 100 Power Systems 110 High-voltage battery 120 DC-DC converters 130 High-voltage battery SMR 140 Auxiliary Battery (Auxiliary LiB) 151 No. 1 Auxiliary Battery SMR 152 Second Auxiliary Battery SMR 160 Test load 170 Diagnostic devices 171 High-voltage battery SMR processing unit 172 Auxiliary Battery SMR Processing Unit 180 load

Claims

[Claim 1] A diagnostic device for relays installed in a vehicle, A first processing unit that controls the on / off state of a high-voltage battery relay provided in a path for supplying power from a high-voltage battery to loads, and an auxiliary battery relay provided in a path for supplying power from an auxiliary battery to the said loads, The system includes a second processing unit that performs a seizure diagnosis of the high-voltage battery relay and the auxiliary battery relay in accordance with the control of the first processing unit, The first processing unit is a diagnostic device that controls the timing of the high-voltage battery relay sticking diagnosis and the auxiliary battery relay sticking diagnosis so that they do not overlap. [Claim 2] The diagnostic device according to claim 1, wherein the second processing unit performs a diagnosis of sticking of the auxiliary battery relay while the high-voltage battery relay is held in the ON position. [Claim 3] The aforementioned auxiliary battery relay consists of a first auxiliary battery relay and a second auxiliary battery relay. The diagnostic device according to claim 2, wherein the first processing unit performs a fixation diagnosis of the first auxiliary battery relay during the period when the second auxiliary battery relay is off, and performs a fixation diagnosis of the second auxiliary battery relay during the period when the first auxiliary battery relay is off.

Images