Electronic Control Device and Stack Usage Method

• US 20180173559A1
• Filed: 06/30/2016
• Published: 06/21/2018
• Est. Priority Date: 07/01/2015
• Status: Abandoned Application

• Current Assignee: Hitachi Astemo Ltd. (Hitachi, Ltd.)
• Original Assignee: Hitachi Automotive Systems Limited (Hitachi, Ltd.)
• Inventors: MORIKAWA, Tadayuki, KUBOTA, Akihito, ABE, Yusuke, TAKAGI, Teruaki
• Application Number:
  US15/738,319
• Publication Number:
  US 20180173559A1
• Time in Patent Office: Days
• CPC Class Codes: F02D 41/009 using means for generating position or synchronisation signals
• CPC Class Codes: F02D 41/266 the computer being backed-up or assisted by another circuit, e.g. analogue
• CPC Class Codes: F02D 45/00 Electrical control not provided for in groups F02D41/00 - F02D43/00
• CPC Class Codes: G06F 9/4812 by interrupt, e.g. masked
• CPC Class Codes: G06F 9/5038 considering the execution order of a plurality of tasks, e.g. taking priority or time dependency constraints into consideration scheduling strategies G06F9/4881 and subgroups

Abstract

The electronic control device includes a memory and a processor. The processor is configured to use, in executing a task, at least one stack region for the task, which is previously allocated to the task, out of a plurality of stack regions allocated in the memory.

Claims

1-15. -15. (canceled)

16. An electronic control device comprising a memory and a processor,

the processor being configured to use, in executing a task, at least one stack region for the task, which is previously allocated to the task, out of a plurality of stack regions allocated in the memory, as well as configured to execute a stack monitoring task to monitor usage of the stack region at timing of detecting an edge in an engine rotational speed sensor.

17. The electronic control device according to claim 16, wherein the at least one stack region used by the task is set for each group to which tasks are classified based on a predetermined rule.

18. The electronic control device according to claim 16, wherein the processor is a multi-core processor and the memory is connected for each core.

19. The electronic control device according to claim 16, wherein the processor is configured to switch a pointer indicating an address of each stack region in the memory so as to use the at least one stack region previously allocated to the task.

20. The electronic control device according to claim 16, wherein a plurality of levels are set for the task according to a safety level, and

the processor is configured to select the at least one stack region according to a level of the task.

21. The electronic control device according to claim 20, wherein the processor is configured, when executing the task, to disallow usage of at least one stack region previously allocated to a task of higher level than the task.

22. The electronic control device according to claim 20, wherein the processor is configured, when executing a task of higher level than a task being executed, to generate an interrupt processing to execute the task.

23. The electronic control device according to claim 16, wherein the stack regions are classified by level of functional safety of a vehicle.

24. A stack usage method in which when executing a task, a processor of an electronic control device uses at least one stack region for the task, which is previously allocated to the task, out of a plurality of stack regions allocated in a memory, as well as executes a stack monitoring task to monitor usage of the stack region at timing of detecting an edge in an engine rotational speed sensor.

25. The stack usage method according to claim 24, wherein the at least one stack region used by the task is set for each group to which tasks are classified based on a predetermined rule.

26. The stack usage method according to claim 24, wherein the processor switches a pointer indicating an address of each stack region in the memory so as to use the at least one stack region previously allocated to the task.

27. The stack usage method according to claim 24, wherein a plurality of levels are set for the task according to a safety level, and

the processor selects the at least one stack region according to a level of the task.

28. The stack usage method according to claim 27, wherein when executing the task, the processor disallows usage of at least one stack region previously allocated to a task of higher level than the task.

29. The stack usage method according to claim 27, wherein when executing a task of higher level than a task being executed, the processor generates an interrupt processing to execute the task.

30. The stack usage method according to claim 24, wherein the stack regions are classified by level of functional safety of a vehicle.