In-vehicle systems

Abstract

To provide an on-vehicle system which can execute fault diagnosis of a power supply system even when a vehicle is not executing remote parking control.SOLUTION: An on-vehicle system comprises: a first backup power supply system which is connected to a battery power supply, is connected to a brake system via a relay and supplies backup power to the brake system by making the relay electrically conducted during execution of remote parking control; a second backup power supply system which is connected to the battery power supply, is connected to the brake system and supplies the backup power to the brake system during non-execution of the remote parking control; and a fault diagnosis system which is inserted to a gap between the relay and the brake system and executes fault diagnosis of the power supply system using the supply power via the relay. The first backup power supply system makes the relay electrically conducted in a prescribed time regardless of whether or not the remote parking control is being executed when ignition of the vehicle is turned ON.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to an in-vehicle system installed in a vehicle. [Background technology]

[0002] Patent Document 1 discloses a control device for an electric brake device that can quickly brake and stop the vehicle using an auxiliary power supply system even if the main power supply system fails while remote parking control is being executed. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-014173 Summary of the Invention [Problem to be solved by the invention]

[0004] In the control device described in Patent Document 1, when power is supplied from the auxiliary power system via a relay to a fault diagnosis system that diagnoses faults in the power supply system, the relay is disconnected (off) when the vehicle is not performing remote parking control, so no power is supplied from the auxiliary power system to the fault diagnosis system, and there is a risk that fault diagnosis of the power supply system cannot be performed.

[0005] The present disclosure has been made in consideration of the above-mentioned problems, and aims to provide an in-vehicle system that can perform fault diagnosis of the power supply system even when the vehicle is not executing remote parking control. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, one aspect of the disclosed technology is an on-board system mounted on a vehicle, comprising: a first backup power supply system connected to a battery power source and connected to a brake system via a relay, and supplying backup power to the brake system by closing the relay when remote parking control is being executed; a second backup power supply system connected to the battery power source and connected to the brake system, and supplying backup power to the brake system when remote parking control is not being executed; and a fault diagnosis system inserted between the relay of the first backup power supply system and the brake system, and performing fault diagnosis of the power supply system using power supplied via the relay, wherein the first backup power supply system is an on-board system that closes the relay for a predetermined time when the vehicle ignition is turned on, regardless of whether remote parking control is being executed or not. Effect of the Invention

[0007] According to the in-vehicle system of the present disclosure, a fault diagnosis of the power supply system can be performed even when the vehicle is not executing remote parking control. [Brief description of the drawings]

[0008] [Figure 1] A functional block diagram of an in-vehicle system and its peripheral parts according to an embodiment of the present disclosure. [Diagram 2] FIG. 13 is a diagram showing an example of the timing of a relay instruction controlled by a control unit of the first backup power supply system; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The in-vehicle system of the present disclosure supplies power to the fault diagnosis system for a predetermined period of time every time the ignition switch of the vehicle is turned on. This makes it possible to perform fault diagnosis using the fault diagnosis system during the predetermined period of time during which power is being supplied, even if the vehicle is not executing remote parking control. Hereinafter, an embodiment of the present disclosure will be described in detail with reference to the drawings.

[0010] <Embodiment> [composition] Fig. 1 is a functional block diagram of an in-vehicle system 100 according to an embodiment of the present disclosure and its peripheral parts. The functional blocks illustrated in Fig. 1 include a first backup power supply system 110, a second backup power supply system 120, a fault diagnosis system 130, a brake system 140, a control system (SBW) 150, and a control system (PDB) 160. Note that the number of control systems constituting the in-vehicle system 100 is not limited to that in Fig. 1, and three or more control systems may be provided.

[0011] The in-vehicle system 100 according to this embodiment can be mounted on a vehicle equipped with a control system that requires a redundant power supply configuration. In the following embodiment, a case where the in-vehicle system 100 is mounted on a vehicle that enables remote parking control using a brake system 140, which is a control system that requires a redundant power supply configuration, will be described as an example.

[0012] (1) First backup power system The first backup power supply system 110 is connected to a battery BATT mounted on a vehicle. The first backup power supply system 110 is also connected to a fault diagnosis system 130, a control system (SBW) 150, and a control system (PDB) 160. The first backup power supply system 110 is configured to supply power of +B potential, which is powered by the battery BATT, to the fault diagnosis system 130, the control system (SBW) 150, and the control system 160 (PDB). The first backup power supply system 110 is one of the power supply systems configured redundantly.

[0013] The first backup power supply system 110 includes a first relay 111, a second relay 112, a control unit 113, a DCDC converter (DC / DC) 114, and a capacitor 115. When supplying power, the first backup power supply system 110 can supply the backup power stored in the capacitor 115 to the control system 150 (SBW) and the control system (PDB) 160, etc., via the DCDC converter (DC / DC) 114. The first relay 111 is a relay for disconnecting the first backup power supply system 110 from the battery BATT when a power supply fails, etc. For the first relay 111, for example, an excitation type mechanical relay or the like can be used. In addition, the first backup power supply system 110 supplies power of the +B potential of the battery power supply to the fault diagnosis system 130 via the second relay 112. The second relay 112 switches between an electrical conductive / cut-off state based on a relay instruction output from the control unit 113. For example, a semiconductor relay or the like can be used for this second relay 112. The DCDC converter (DC / DC) 114 is a DCDC converter for rapid charging that stores the power of the +B potential of the battery power supply in a capacitor 115 as backup power and outputs the backup power stored in the capacitor 115 to the control system (SBW) 150 and the control system 160 (PDB) as necessary. The capacitor 115 is a power storage element that stores the backup power.

[0014] This first backup power supply system 110 operates to supply power to the fault diagnosis system 130 via the second relay 112 by making the second relay 112 conductive (turning it on) when remote parking control is being executed (during remote parking) in which a fast charging speed is required.

[0015] The first backup power supply system 110 also receives an "IGR signal" indicating the state of the vehicle's ignition switch (IG-ON or IG-OFF) from another device mounted on the vehicle. The control unit 113 outputs a relay instruction for controlling the operation of the second relay 112 to the second relay 112 based on this IGR signal. This control unit 113 is composed of a microcomputer including, for example, a processor, a memory, an input / output interface, and the like, and realizes a predetermined function by the processor reading and executing a program stored in the memory.

[0016] (2) Second backup power system The second backup power supply system 120 is connected to a battery BATT mounted on the vehicle. The second backup power supply system 120 is also connected to a brake system 140. The second backup power supply system 120 is configured to be able to supply power of +B potential, which is powered by the battery BATT, to the brake system 140. The second backup power supply system 120 is the other of the redundantly configured power supply systems.

[0017] The second backup power supply system 120 includes a first relay 121, a second relay 122, and a capacitor 123. When the first relay 121 and the second relay 122 are turned on to supply power, the second backup power supply system 120 charges the capacitor 123, which is a storage element, with power at the +B potential of the battery power supply and then supplies the power to the brake system 140. Therefore, the charging speed of the second backup power supply system 120 is slower than that of the first backup power supply system 110. The first relay 121 is a relay for separating the second backup power supply system 120 from the battery BATT in the event of a power failure or the like. For the first relay 121 and the second relay 122, for example, an excitation type mechanical relay or the like can be used.

[0018] This second backup power system 120 operates to power the braking system 140 when not performing remote parking controls, which do not require a fast charging rate.

[0019] (3) Fault diagnosis system The fault diagnosis system 130 is a system for performing fault diagnosis of the power supply system, and more specifically, a system for performing fault diagnosis of a relay 131 provided as a component. More specifically, the fault diagnosis system 130 checks whether or not a fault has occurred in which the relay 131 is stuck in the OFF state. This fault diagnosis system 130 is inserted and connected between the output end side of the second relay 112 of the first backup power supply system 110 and the brake system 140. For example, an excitation type mechanical relay can be used as the relay 131.

[0020] (4) Other Systems The brake system 140 is a control system capable of generating a braking force on the vehicle through a brake actuator (ACT) of the vehicle by means of an electric brake mechanism (not shown).

[0021] The control system (SBW) 150 and the control system (PDB) 160 are systems mounted on a vehicle. Systems other than the control system (SBW) 150 and the control system (PDB) 160 may be mounted on the vehicle.

[0022] [control] Next, the control executed by the in-vehicle system 100 according to this embodiment will be described with further reference to Fig. 2. Fig. 2 is a diagram showing an example of the timing of a relay instruction for controlling the operation of the second relay 112, which is controlled by the control unit 113 of the first backup power supply system 110.

[0023] As shown in FIG. 2, when the control unit 113 of the first backup power supply system 110 of this embodiment receives an "IGR signal-ON", which is an IGR signal indicating that the vehicle's ignition switch is turned on, it outputs a "relay instruction-ON" to the second relay 112, which is a relay instruction to keep the second relay 112 conductive for only 10 seconds two seconds after the "IGR signal-ON" is received.

[0024] By this control, regardless of whether the vehicle is executing remote parking control or not, the second relay 112 is always conductive for 10 seconds every time the ignition switch is turned on. In other words, a power supply path is formed from the battery power source → first backup power supply system 110 → second relay 112 → fault diagnosis system 130. Therefore, even if the vehicle is not executing remote parking control, power is supplied from the first backup power supply system 110 to the fault diagnosis system 130, making it possible to perform fault diagnosis of the relay 131 during this 10-second period.

[0025] 2 is only an example. The time to wait from the time when the "IGR signal-ON" is received and the time to keep the second relay 112 in a conducting state for 10 seconds can be set arbitrarily based on the performance and accuracy required for the in-vehicle system 100.

[0026] <Actions and Effects> As described above, according to the in-vehicle system 100 according to one embodiment of the present disclosure, the second relay 112 is always conductive for a predetermined time (e.g., 10 seconds) every time the vehicle ignition switch is turned on, regardless of whether the vehicle is executing remote parking control or not.

[0027] Therefore, even if the vehicle is not executing remote parking control, power is supplied from the first backup power supply system 110 to the fault diagnosis system 130, making it possible to perform fault diagnosis of the power supply system (relay 131) during the specified time that this power is being supplied.

[0028] The above describes one embodiment of the disclosed technology, but the present disclosure can be understood as a vehicle equipped with an in-vehicle system, a control method executed by an in-vehicle system having a processor and a memory, a control program for executing the control method, a computer-readable non-transitory storage medium storing the control program, and a power supply system including the in-vehicle system. [Industrial Applicability]

[0029] The in-vehicle system of the present disclosure can be used in vehicles equipped with redundant power supply systems. [Explanation of symbols]

[0030] 110 First Backup Power System 111 First Relay 112 Second Relay 113 Control Unit 114 DC / DC Converter 115 Capacitor 120 Second Backup Power System 121 First Relay 122 Second Relay 123 Capacitor 130 Fault diagnosis system 131 Relay 140 Brake System 150 Control System (SBW) 160 Control System (PDB)

Claims

[Claim 1] An in-vehicle system installed in a vehicle, a first backup power supply system connected to a battery power supply and connected to a brake system via a relay, the first backup power supply system turning on the relay when a remote parking control is being performed to supply backup power to the brake system; a second backup power supply system connected to the battery power supply and to the brake system, the second backup power supply system being configured to supply backup power to the brake system when the remote parking control is not being executed; a fault diagnosis system that is inserted between the relay of the first backup power supply system and the brake system and performs fault diagnosis of the power supply system using power supplied via the relay, the first backup power supply system conducts the relay for a predetermined time when an ignition of the vehicle is turned on, regardless of whether the remote parking control is being executed or not. In-vehicle systems.

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