mirror of https://github.com/ArduPilot/ardupilot
118 lines
3.5 KiB
C++
118 lines
3.5 KiB
C++
/*
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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simple internal combustion engine simulator class
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*/
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#include "SIM_ICEngine.h"
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#include <stdio.h>
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using namespace SITL;
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/*
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update engine state, returning power output from 0 to 1
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*/
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float ICEngine::update(const Aircraft::sitl_input &input)
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{
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bool have_ignition = ignition_servo>=0;
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bool have_choke = choke_servo>=0;
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bool have_starter = starter_servo>=0;
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float throttle_demand = (input.servos[throttle_servo]-1000) * 0.001f;
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state.ignition = have_ignition?input.servos[ignition_servo]>1700:true;
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state.choke = have_choke?input.servos[choke_servo]>1700:false;
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state.starter = have_starter?input.servos[starter_servo]>1700:false;
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uint64_t now = AP_HAL::micros64();
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float dt = (now - last_update_us) * 1.0e-6f;
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float max_change = slew_rate * 0.01f * dt;
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if (!have_starter) {
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// always on
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last_output = throttle_demand;
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return last_output;
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}
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if (state.value != last_state.value) {
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printf("choke:%u starter:%u ignition:%u\n",
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(unsigned)state.choke,
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(unsigned)state.starter,
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(unsigned)state.ignition);
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}
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if (have_ignition && !state.ignition) {
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// engine is off
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if (!state.starter) {
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goto engine_off;
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}
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// give 10% when on starter alone without ignition
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last_update_us = now;
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throttle_demand = 0.1;
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goto output;
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}
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if (have_choke && state.choke && now - start_time_us > 1000*1000UL) {
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// engine is choked, only run for 1s
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goto engine_off;
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}
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if (last_output <= 0 && !state.starter) {
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// not started
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goto engine_off;
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}
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if (start_time_us == 0 && state.starter) {
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if (throttle_demand > 0.2) {
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printf("too much throttle to start: %.2f\n", throttle_demand);
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} else {
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// start the motor
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if (start_time_us == 0) {
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printf("Engine started\n");
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}
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start_time_us = now;
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}
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}
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if (start_time_us != 0 && state.starter) {
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uint32_t starter_time_us = (now - start_time_us);
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if (starter_time_us > 3000*1000UL && !overheat) {
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overheat = true;
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printf("Starter overheat\n");
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}
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} else {
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overheat = false;
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}
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output:
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if (start_time_us != 0 && throttle_demand < 0.01) {
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// even idling it gives some thrust
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throttle_demand = 0.01;
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}
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last_output = constrain_float(throttle_demand, last_output-max_change, last_output+max_change);
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last_output = constrain_float(last_output, 0, 1);
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last_update_us = now;
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last_state = state;
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return last_output;
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engine_off:
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if (start_time_us != 0) {
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printf("Engine stopped\n");
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}
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last_update_us = AP_HAL::micros64();
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start_time_us = 0;
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last_output = 0;
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last_state = state;
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start_time_us = 0;
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return 0;
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}
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