Control device for automatic transmission
AssigneeMazda Motor Corporation
InventorsTomokazu Kinoshita, Shotaro Hara, Shoji Abe, Toshiaki Shirasago
Life of this patent
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Abstract
A control device for an automatic transmission is provided, which includes a friction engagement element, and a processor configured to execute gear change control logic configured to control a gear change operation by supplying and discharging hydraulic fluid for forming a gear stage to/from the friction engagement element, and lubricant supply control logic configured to control to switching operation of a supply amount of lubricant to the friction engagement element according to an operating state of a vehicle. The processor controls the gear change operation and the switching operation to not overlap with one another.
Claims5
A control device for an automatic transmission, comprising:
- a friction engagement element;
- and
- a processor configured to execute:
- gear change control logic configured to control a gear change operation by supplying and discharging hydraulic fluid for forming a gear stage to and from the friction engagement element;
- and
- lubricant supply control logic configured to control a switching operation to switch a supply amount of lubricant to the friction engagement element according to an operating state of a vehicle,
- wherein the processor is further configured to control the gear change operation and the switching operation to not overlap with one another, and
- wherein the processor prohibits the gear change operation when the lubricant supply control logic performs the switching operation.
A control device for an automatic transmission, comprising:
- a friction engagement element;
- and
- a processor configured to execute:
- gear change control logic configured to control a gear change operation by supplying and discharging hydraulic fluid for forming a gear stage to and from the friction engagement element;
- and
- lubricant supply control logic configured to control a switching operation to switch a supply amount of lubricant to the friction engagement element according to an operating state of a vehicle,
- wherein the friction engagement element includes a brake configured to be engaged when the vehicle starts traveling, and an other friction engagement element,
- wherein the processor is further configured to execute temperature calculation logic to detect a temperature of the brake,
- wherein the lubricant supply control logic controls the supply amount of lubricant to the brake so that the lubricant is supplied at a given first flow rate, when the temperature of the brake is below a first threshold,
- wherein the lubricant supply control logic controls the supply amount of lubricant to the brake so that the lubricant is supplied at a given second flow rate greater than the given first flow rate, when the temperature of the brake is equal to or above the first threshold,
- wherein the lubricant supply control logic controls the supply amount of lubricant to the brake so that the lubricant is supplied at a maximum flow rate greater than the given second flow rate, when the temperature of the brake is equal to or above a second threshold above the first threshold, and
- wherein the processor limits the gear change operation when the lubricant is supplied to the brake at the maximum flow rate, even when the gear change control logic outputs a gear change command.
Dependencies are inferred from the claim text.